Best Smart Locks in Singapore 2026: Top Digital Door, Gate and Bundle Picks
Interlock Singapore
The best digital lock in Singapore is not necessarily the model with the longest feature list. It is the lock that fits your entrance, suits the people living in your home and provides the access methods and security features your household will actually use.
A multi-generation family may benefit from facial recognition and palm vein access because fingerprint recognition may perform differently across users. A homeowner who wants keyless convenience without another mobile app may be better served by an offline lock. A household that receives frequent online purchases may place greater value on parcel visibility at the gate than on having every premium feature on the wooden door.
That is how we selected the best digital and smart locks in this guide. Each model is ranked according to the specific job it performs best, the household it suits and the technical strengths that support that recommendation.
For the strongest premium all-round smart lock experience, our top pick is the Interlock Mercury X6. It combines advanced biometrics, flexible temporary access, video monitoring and premium physical construction in one main-door lock.
For homeowners who want dependable digital access without Wi-Fi, cloud accounts or unnecessary complexity, the Interlock Mercury X2 is our best affordable choice.
You can also browse our complete collection of digital locks in Singapore. Homeowners researching a gate-only replacement can refer to our dedicated digital gate lock guide for Singapore homes.
Transparency note: This guide is written by Interlock Singapore and includes products that we sell and install. Our recommendations are based on each model's intended purpose, technical strengths, household suitability, access requirements and practical installation considerations.
Price disclaimer: Prices in this guide were checked on 14 June 2026. Prices, promotions, bundle configurations, installation scope and availability may change. Please check the respective product pages for the latest information before purchasing.
Quick Summary: Best Digital Locks in Singapore 2026
- Best premium smart door lock overall: Interlock Mercury X6
- Best affordable digital door lock: Interlock Mercury X2
- Best premium door-and-gate bundle: Mercury X6 + G4
- Best glass door lock: Interlock Mercury GD1
- Best sliding door lock: Interlock Mercury SD1
Best Digital Locks at a Glance
| Best For | Recommended Model | Checked Price | Why It Stands Out |
|---|---|---|---|
| Premium all-round performance | Interlock Mercury X6 | $849, usual $899 | Advanced biometrics, custom temporary PINs, OTPs, video monitoring, motion detection and premium aluminium construction. |
| Affordable keyless convenience | Interlock Mercury X2 | $549, usual $649 | Simple fingerprint, PIN, card and key access without Wi-Fi, cloud storage or app setup. |
| Advanced biometrics at better value | Interlock Mercury X5 | $659, usual $799 | Face, palm vein, fingerprint, temporary access and HD camera functions at a lower price than the X6. |
| Rental and changing-user access | Interlock Mercury X5 | $659, usual $799 | Supports temporary PIN functions and app-based access management for changing occupants. |
| Apple smart-home integration | Aqara A100 | $648, usual $684 | Best suited to homeowners already using Apple Home, Apple Home Key or Aqara devices. |
| Simple Korean digital lock | Gateman SP122 | $549, usual $649 | A focused PIN-and-card model for homeowners who prefer fewer connected features. |
| Maximum entrance assurance | Mercury X6 + G4 | From $1,349, usual from $1,549 | Premium biometrics with Interlock DualKey™ to provide mechanical key access from both sides of the gate. |
| Parcel and visitor visibility | Mercury X6 + G3 | Check current bundle price | Combines a premium main-door lock with a dual-camera gate lock designed for visitor and parcel viewing. |
| Value complete entrance | Mercury X2 + G3 | From $999, usual from $1,099 | Keeps the door simple while adding dual cameras, video intercom and connected functions at the gate. |
| Glass doors | Interlock Mercury GD1 | $528, usual $749 | A feature-rich model intended specifically for compatible glass-door installations. |
| Sliding doors | Interlock Mercury SD1 | $528, usual $749 | Uses a dedicated sliding-door format instead of adapting a standard swing-door lock. |
Jump to a Recommendation
- How we chose the best digital locks
- Best overall and premium pick: Mercury X6
- Best affordable and offline pick: Mercury X2
- Best value biometric smart lock: Mercury X5
- Best for Apple Home: Aqara A100
- Best simple Korean lock: Gateman SP122
- Best premium bundle: Mercury X6 + G4
- Best parcel-viewing bundle: Mercury X6 + G3
- Best value bundle: Mercury X2 + G3
- Alternative Korean bundle: Solity GEA1000K + G1
- Best glass door lock: Mercury GD1
- Best sliding door lock: Mercury SD1
- Choose by household type
- Installation and compatibility checks
- Frequently asked questions
- Final recommendations
How We Chose the Best Digital Locks
We did not rank these locks simply by counting how many features appear on each product page.
A model with facial recognition, palm vein recognition, app access and cameras may be excellent for one family but unnecessarily complicated for another. An offline lock may appear less advanced on paper while being a more suitable long-term choice for a homeowner who does not need remote access or cloud-based records.
Each lock therefore had to earn its recommendation through a combination of technical strengths and real household benefits:
- Daily usability: Can children, adults, elderly parents and helpers operate it comfortably?
- Access flexibility: Are useful alternatives available when one biometric method is inconvenient?
- Temporary access: Can homeowners provide controlled access to visitors, cleaners, tenants or contractors?
- Connected usefulness: Do its app, camera or smart-home features solve a genuine household problem?
- Backup assurance: Are there practical alternatives during low battery or an unexpected lockout?
- Construction and design: Does the physical build support the product's intended positioning?
- Installation suitability: Is the model appropriate for the intended wooden, glass or sliding door?
- Value: Are homeowners paying for features they are likely to use?
The best model is therefore not automatically the most expensive one. It is the lock whose strengths match the household using it.
Best Digital Door Locks in Singapore
Best Overall and Best Premium Digital Door Lock: Interlock Mercury X6
The Interlock Mercury X6 is our best overall digital door lock because it combines premium physical construction, advanced access control and useful entrance-monitoring features in one complete main-door system.
Checked price: $849 promotional price, usual $899.
Best for: HDB, condo and landed homeowners who want a premium smart entrance without relying on only one way to unlock.
Access methods: Palm vein recognition, advanced 3D facial recognition, fingerprint, PIN, RFID card, Tuya app and mechanical key.
The X6 does not win simply because it has more features. It wins because its features solve several different household problems at once.
A working adult carrying groceries can unlock using facial recognition without touching the lock. An elderly parent whose fingerprints are dry or worn can use face, palm vein, card or PIN. A child can use an RFID card or another access method selected by the family. Fingerprint remains available for familiar daily entry, while PIN and mechanical key access provide additional alternatives.
This gives different family members a suitable way to enter instead of forcing everyone to depend on the same biometric method.
More Control Over Temporary Access
The X6 also provides more flexible access management than a basic digital lock.
Homeowners can create custom temporary PINs for specific users and use one-time passwords when temporary access is needed without permanently registering another fingerprint, face or card.
This may be useful for cleaners, contractors, visiting relatives, deliveries or other short-term access situations. Once the access is no longer required, the household does not have to continue sharing a permanent family PIN.
Video Monitoring and Motion Detection
The X6 includes an integrated camera, video monitoring and recording functions, together with motion detection and doorbell features.
This allows homeowners to view who is at the door and provides a more complete entrance experience than a conventional digital lock that only controls unlocking.
The built-in monitoring is useful for visitor awareness, checking the entrance and reviewing supported recordings. However, like other lock-mounted cameras, it should not be treated as a complete replacement for a dedicated CCTV surveillance system designed for continuous recording and wider coverage.
Premium Aluminium Build and Curved Design
The X6 also distinguishes itself through its physical construction.
It uses a strong premium aluminium build intended to give the lock a more solid and substantial feel. Its curved profile is not purely decorative. The shape follows the movement of the hand, making it natural to grip and push the door open after recognition.
This combination of strength, shape and finish helps the X6 feel like a premium entrance product rather than a collection of electronic features fitted onto a standard lock body.
Why it wins overall: The X6 combines advanced biometrics, flexible temporary access, video monitoring, motion detection, visitor features, mechanical backup and premium physical construction in one system.
The X6 is particularly strong for:
- Multi-generation households.
- Users who want alternatives to fingerprint recognition.
- Families that value contactless entry.
- Homeowners who regularly provide temporary access.
- Buyers who want video monitoring and entrance awareness.
- Customers who value a premium aluminium build and curved ergonomic design.
- Homeowners planning a premium door-and-gate bundle.
Consider another model if: You do not need app access, cameras, temporary online management or rechargeable battery maintenance. The Mercury X2 provides a simpler and more affordable route to keyless entry.
Best Affordable, Cloudless and Easy-to-Use Digital Door Lock: Interlock Mercury X2
The Interlock Mercury X2 is our best affordable digital door lock because it provides trusted everyday keyless convenience without requiring homeowners to learn or maintain a connected smart-lock ecosystem.
Checked price: $549 promotional price, usual $649.
Best for: First-time digital lock buyers, new BTO homeowners, less tech-confident users, privacy-conscious households and families that prefer no app.
Access methods: Fingerprint, PIN, RFID card and mechanical key.
As more homes move towards smart locks, not every user finds the additional technology easier.
Entering advanced lock settings, managing an app, understanding different user permissions and adjusting multiple connected features can feel complicated for homeowners who only want convenient and secure entry.
The X2 is designed for that household.
Users can register fingerprints, set a PIN, issue RFID cards where necessary and retain a mechanical key for backup. There is no Wi-Fi connection to configure, no cloud account to create and no mobile application that family members must learn.
No App, No Cloud and No Server-Based Access Logs
The X2 operates locally without a Wi-Fi or cloud connection.
Because it does not connect to an app platform, access records are not uploaded and stored as cloud-based logs through the lock's ecosystem. This can appeal to homeowners who are uncomfortable with a connected entrance device or who prefer to minimise the amount of household access data transmitted online.
An offline design does not make every form of security risk impossible. Homeowners must still manage PINs, RFID cards, fingerprints, batteries and mechanical keys responsibly. However, it removes the cloud and home-network layer found in connected smart locks.
Simple Does Not Mean Ineffective
The X2 should not be viewed simply as an X6 with fewer features. It is designed around a different priority: effective and efficient local access.
For many households, fingerprint, PIN, RFID card and mechanical key access are enough. If the same permanent family members use the door every day, remote user management and video monitoring may not add enough value to justify the additional cost or complexity.
The X2 also uses AA alkaline batteries rather than a rechargeable battery pack. Some homeowners may prefer replacing batteries occasionally instead of remembering to remove and recharge a battery.
Why it wins for affordability and simplicity: The X2 reduces cost and complexity by removing connected and premium biometric functions, not by removing the essential access methods required for everyday keyless entry.
The X2 is particularly strong for:
- Homeowners who want a cloudless digital lock.
- Users who do not want a mobile app.
- Less tech-confident households.
- Privacy-conscious homeowners wary of connected entrance devices.
- Permanent households that do not frequently add or remove users.
- Buyers who prefer replaceable AA batteries.
- Customers looking for effective keyless access at a lower price.
Consider another model if: You need temporary PIN management, OTPs, remote viewing or contactless face and palm vein entry. The Mercury X5 or X6 will be more appropriate.
Best Value Biometric Smart Lock and Best for Rental Access: Interlock Mercury X5
The Interlock Mercury X5 occupies the space between the straightforward X2 and the flagship X6.
Checked price: $659 promotional price, usual $799.
Best for: Rental units, property owners, temporary-access situations and homeowners who want advanced biometrics at a lower price than the X6.
Access methods: Facial recognition, palm vein recognition, fingerprint, PIN, RFID card, Tuya app and mechanical key.
The X5 is our best value biometric smart lock because it retains many of the access technologies homeowners associate with a premium model.
Users still receive facial recognition, palm vein recognition, fingerprint access and app management without paying for every flagship design and camera advantage found on the X6.
Temporary Access Without Permanent Registration
Like the X6, the X5 supports temporary access functions such as automatically generated temporary PINs.
This can be useful for landlords, cleaners, visiting relatives, contractors and other temporary users. Instead of sharing a permanent household code or registering every short-term visitor as a permanent user, the homeowner can provide limited access for the intended purpose.
This is one reason the X5 is particularly relevant for rental properties or homes with changing occupants.
HD Camera With a More Affordable Positioning
The X5 and X6 both use HD camera specifications, but their actual visual presentation is not identical.
The X5 provides useful camera viewing, but its colour reproduction may not appear as strong or refined as the X6. Homeowners who place a high priority on the strongest visitor-viewing experience should therefore consider the X6.
For buyers who mainly want advanced biometrics, temporary access and basic entrance viewing at a lower price, the X5 remains a strong value choice.
Distinctive Chromium Outer Finishing
The X5 also has an additional chromium-style outer finishing that gives it a different appearance from the X6.
This may appeal to homeowners who prefer a more reflective, metallic exterior and a slimmer overall lock profile.
Why it wins for value: It provides palm vein, facial recognition, temporary PIN functions, app access and an HD camera at a considerably lower entry price than the flagship X6.
The X5 is particularly strong for:
- Buyers who want advanced biometrics without paying for the flagship model.
- Landlords and homeowners who regularly manage temporary users.
- Customers who want temporary PIN functions.
- Homeowners who prefer a slimmer design and chromium-style finishing.
- Families that want camera viewing but do not require the X6's stronger colour presentation.
Consider another model if: Premium build, stronger camera colour presentation, custom temporary PIN control and the complete flagship entrance experience are priorities. In that case, choose the X6.
Consider the X2 instead if: The household only needs permanent local users and prefers no app or cloud connection.
Best Digital Lock for Apple Home Users: Aqara A100
The Aqara A100 is our best smart-home ecosystem pick, particularly for homeowners already using Apple Home or Aqara devices.
Checked price: $648 promotional price, usual $684.
Best for: Apple Home, Apple Home Key and Aqara ecosystem users.
The A100's main advantage is not that it provides more biometric methods than every competing lock. Its strength is integration.
For an Apple-focused household, using the lock within an established smart-home environment may be more valuable than having palm vein recognition or a built-in camera. The A100 supports fingerprint, PIN, NFC, app functions and mechanical key access, together with its Apple and Aqara ecosystem capabilities, subject to the required setup and compatible devices.
This can make the lock more useful as part of a broader automation setup. Homeowners already using compatible Aqara devices may prefer managing access within a familiar ecosystem instead of introducing another platform purely for the door lock.
Why it wins for smart homes: It is designed to become part of a wider connected-home environment rather than operate only as a standalone door lock.
Consider another model if: You are not invested in the Apple or Aqara ecosystem. For households that mainly want flexible biometrics, temporary PIN control and an integrated visitor-viewing experience, the Mercury X6 is the stronger all-round choice.
Best Simple Korean Digital Lock: Gateman SP122
The Gateman SP122 is our pick for homeowners who want a straightforward Korean digital lock without cameras, facial recognition or connected-home features.
Checked price: $549 promotional price, usual $649.
Best for: Homeowners who value a familiar PIN-and-card experience and prefer an established Korean digital lock format.
The SP122 is not competing to be the most technologically advanced model in this guide. Its appeal is the opposite: a focused set of functions and uncomplicated daily use.
For households that are comfortable using PIN and RFID card access, additional biometric and connected functions may not improve the experience enough to justify the added complexity.
Why it wins for simplicity: It serves homeowners who deliberately prefer a focused Korean PIN-and-card lock over a feature-heavy connected model.
Best Digital Door-and-Gate Lock Bundles
A door-and-gate bundle is not automatically better simply because both locks have long feature lists.
The best bundle depends on whether the household prioritises maximum lockout assurance, parcel viewing, connected visitor functions, premium biometrics or straightforward value.
Best Premium Bundle for Security Assurance: Mercury X6 + G4
The Mercury X6 + Mercury G4 is our best premium bundle for homeowners who want advanced biometric convenience together with stronger protection against an unexpected gate lockout.
Checked bundle price: From $1,349 promotional price, usual from $1,549. Final pricing depends on the selected bundle configuration.
Best for: HDB and condo homeowners who prioritise premium access, security assurance and practical backup options across the complete entrance.
Why Interlock DualKey™ Matters
The defining feature of the G4 is Interlock DualKey™.
The G4 is positioned as one of the first digital gate locks in Singapore to provide mechanical key access from both the inside and outside of the gate.
This matters because many digital gate locks only provide a mechanical keyhole on the inside. An inside-only keyhole may help a user unlock the gate from within the home, but it does not necessarily solve an external lockout when the gate battery is flat and emergency power is unavailable or not functioning as expected.
With an external mechanical keyhole, the homeowner retains another physical method of entry from outside.
No backup method removes the need for proper battery maintenance or responsible key storage. However, DualKey provides an additional layer of assurance that many competing gate locks do not offer.
Advanced Biometric and Everyday Access
The G4 is not only built around its mechanical backup.
It also includes palm vein recognition, facial recognition, fingerprint, PIN and RFID card access. From inside the home, users can also unlock using an RFID tag, providing another convenient exit method compared with the G3.
This combination allows family members to select the access method that suits them while retaining a physical backup on both sides of the gate.
Camera, Wi-Fi and Anti-Pry Protection
The G4 includes a built-in camera that connects through Wi-Fi to the Tuya app. Homeowners can use it to view and understand who is at the entrance, together with supported video and monitoring functions.
The camera is useful for visitor awareness, but it is not intended to replace a dedicated CCTV surveillance system. CCTV systems are generally designed for wider coverage and more continuous monitoring.
Gate-lock footage also depends on the available Wi-Fi connection. Metal gates can interfere with wireless signals, so video loading and connected functions may be affected by router distance, network configuration and the physical gate environment.
These limitations do not remove the value of the camera. They simply define its correct purpose: convenient entrance viewing rather than full-time property surveillance.
The G4 also includes motion-related monitoring and anti-pry alerts, strengthening its position as a gate lock focused on assurance and entrance security.
Why the X6 + G4 Wins
The X6 handles the main door with advanced biometrics, temporary access, video monitoring, motion detection and premium construction.
The G4 adds strong gate access, anti-pry alerts, app viewing and DualKey mechanical backup from both sides.
Compatible Mercury door-and-gate combinations can also be configured with Interlock's Advanced Dual Synchronised Module™, reducing the need to unlock the gate and door as two completely separate daily actions.
Why it wins as a premium bundle: It combines advanced convenience with a stronger backup-access philosophy. The bundle is not only designed to make entry easier; it is designed to provide greater confidence when electronic access does not operate as expected.
To compare the G4 with other gate models, read our separate digital gate lock comparison for Singapore homes.
Best Premium Bundle for Parcel Visibility: Mercury X6 + G3
The Mercury X6 + Mercury G3 is our preferred premium bundle for households that value parcel viewing and additional gate-camera coverage more than external mechanical key access.
Best for: Families that receive frequent online purchases, homeowners who want stronger gate visibility and buyers who prefer a dual-camera gate lock.
Dual Cameras for Visitors and Parcels
The G3 includes dual built-in cameras.
One camera supports normal visitor viewing, while the additional camera improves visibility around the lower parcel area. This can be particularly useful for households that receive frequent online deliveries and want to check whether a parcel has been left outside.
The extra camera is the G3's clearest advantage over the G4.
Video, Motion Detection and Anti-Pry Alerts
Like the G4, the G3 supports video-related entrance viewing, motion detection, anti-pry alerts and connected functions through the Tuya app.
Its camera system is useful for checking visitors, viewing supported footage and understanding what is happening immediately outside the gate.
It should still not be treated as a replacement for dedicated CCTV. Its monitoring is not intended to provide the same continuous coverage as a full surveillance system, and video access remains dependent on the available Wi-Fi connection.
Metal gate interference may affect connection performance, particularly when the router is far from the entrance or the 2.4GHz network is not configured suitably.
The Main Trade-Off: No External Keyhole
The G3 does not have the G4's DualKey feature and does not provide an external mechanical keyhole.
This means homeowners choosing the G3 are prioritising the additional parcel-viewing camera over the G4's stronger external mechanical backup.
Neither model is automatically better for every home.
- Choose the G4 when lockout assurance and DualKey access matter most.
- Choose the G3 when dual-camera parcel viewing matters more.
Why the X6 + G3 wins for parcel visibility: It combines the premium X6 main-door experience with a gate lock designed to provide clearer awareness of both visitors and the parcel area.
Best Value Door-and-Gate Bundle: Mercury X2 + G3
The Mercury X2 + Mercury G3 is our best value bundle because it places the advanced connected features where many homeowners find them most useful: at the outer gate.
Checked bundle price: From $999 promotional price, usual from $1,099.
Best for: Homeowners who want straightforward door access together with smarter parcel and visitor visibility.
The X2 keeps entry through the wooden door uncomplicated with fingerprint, PIN, RFID card and mechanical key access. There is no Wi-Fi, no app and no cloud-based access-log storage on the door lock.
The G3 then adds the connected gate functions: dual cameras, parcel viewing, video intercom, motion detection, anti-pry alerts and remote app features.
This combination follows a practical logic:
- The wooden door provides simple permanent family access.
- The gate handles visitor communication, parcel viewing and connected monitoring.
Homeowners therefore avoid paying for premium biometrics and cameras twice while still receiving useful connected functions at the outermost part of the entrance.
Why it wins for value: The bundle combines a simple, private and affordable door lock with a dual-camera smart gate lock that handles the more demanding visitor and parcel functions.
The G3's dual-camera and connected features are covered in greater detail in our best HDB digital gate lock guide.
Alternative Korean Ecosystem Bundle: Solity GEA1000K + G1
The Solity GEA1000K + Solity G1 is an alternative for homeowners who prefer a Korean push-pull lock ecosystem or have specific fire-rated door and smart-home requirements.
Checked price: $1,199 promotional price, usual $1,299.
Best for: Solity users, selected fire-rated door requirements and households considering Matter-focused integration.
Its appeal is less about competing directly with every Mercury biometric feature and more about providing a coordinated Solity door-and-gate pairing with its own design language and ecosystem.
Best Digital Locks for Glass and Sliding Doors
A standard main-door lock should not be forced onto every type of entrance. Glass and sliding doors have different installation, alignment and locking requirements.
For these applications, choosing the correct lock format matters more than choosing the model with the longest feature list.
Best Glass Door Lock: Interlock Mercury GD1
The Interlock Mercury GD1 is our best glass door lock because it combines modern access methods with a format intended specifically for compatible glass-door installations.
Checked price: $528 promotional price, usual $749.
Best for: Residential glass doors, home offices, office partitions and selected light-commercial glass doors.
Access methods: Facial recognition, fingerprint, PIN, RFID card, app control and mechanical key access.
The most important advantage of the GD1 is not one individual feature. It is that homeowners are not attempting to force a standard wooden-door mortise lock onto a glass setup.
Glass doors have different thickness, clamping, frame and alignment requirements. A suitable glass-door model should therefore be assessed according to the actual glass panel, existing handle and installation condition before purchase.
Why it wins: It provides a strong range of modern access methods while remaining designed for its intended door category.
Best Sliding Door Lock: Interlock Mercury SD1
The Interlock Mercury SD1 is our best sliding door lock because it is designed around the movement and locking requirements of a sliding door rather than a normal swing door.
Checked price: $528 promotional price, usual $749.
Best for: Selected balcony, patio, room, wooden sliding and glass sliding doors.
Access methods: Facial recognition, fingerprint, PIN, RFID card, app control and mechanical key access.
Sliding doors require different latch movement, receiving brackets and alignment tolerances. Attempting to adapt a conventional swing-door lock may result in an installation that is awkward, unattractive or unreliable.
Why it wins: Its specialist design makes it more appropriate for compatible sliding-door applications than a standard main-door model.
For simpler PIN-and-card applications, the Gateman G-Touch is an affordable alternative for selected room, storage, sliding and small-business access requirements.
Which Digital Lock Is Best for Your Household?
| Household or Requirement | Recommended Model | Why It Fits |
|---|---|---|
| Premium HDB or condo upgrade | Mercury X6 | Premium aluminium build, advanced biometrics, temporary access and stronger monitoring functions. |
| New BTO on a controlled budget | Mercury X2 | Provides essential keyless access without paying for connected features that may not be used. |
| Family with children and elderly parents | Mercury X6 | Different users can choose face, palm vein, fingerprint, RFID card or PIN. |
| Elderly parent who prefers simplicity | Mercury X2 | No app or Wi-Fi is required, with RFID card and PIN available as fingerprint alternatives. |
| Elderly user with inconsistent fingerprints | Mercury X6 | Advanced 3D facial recognition and palm vein access reduce reliance on fingerprints. |
| Rental property | Mercury X5 | Temporary PIN functions are more practical when occupants change. |
| Apple-focused smart home | Aqara A100 | Its strongest advantage is Apple Home and Aqara ecosystem integration. |
| No-app or privacy-conscious household | Mercury X2 | Operates locally without Wi-Fi, an app or cloud-based access-log storage. |
| Maximum gate lockout assurance | Mercury X6 + G4 | DualKey provides mechanical key access from both sides of the gate. |
| Frequent online purchases | Mercury X6 + G3 | Dual cameras provide stronger visitor and parcel-area visibility. |
| Affordable complete entrance | Mercury X2 + G3 | Simple offline door entry paired with connected gate cameras and parcel functions. |
| Glass door | Mercury GD1 | A purpose-built glass-door format with several modern access methods. |
| Sliding door | Mercury SD1 | A dedicated lock design for suitable sliding-door applications. |
The Best Lock on Paper May Still Be Wrong for Your Door
Digital lock compatibility should be checked before choosing a model.
Singapore homes can have very different door and gate conditions, even when the properties appear similar. Existing lock holes, door thickness, frame design, handlebar clearance, gate design and the distance between the gate and door can affect which models can be installed cleanly.
A more expensive lock is not automatically a better recommendation when it does not suit the existing entrance.
Previous lock installations are especially important. Large or unusually positioned holes may not be fully covered by a new lock. A model may also fit the wooden door by itself but interfere with the gate when both are closed.
Before confirming a model, prepare:
- A full exterior view of the closed door.
- A full interior view of the closed door.
- A side view of the existing lock and door edge.
- A clear photo of the frame and strike area.
- The door thickness, where possible.
- Photos of previous lock holes or enlarged cut-outs.
- For bundles, a photo showing the closed gate and door together.
- The distance between the gate and wooden door.
- For glass or sliding doors, full views and close-ups of the existing handle, frame and locking area.
This is why Interlock requests door photos before confirming suitability. A compatibility assessment can prevent homeowners from selecting a model that cannot cover previous holes, interferes with the gate or requires an unsuitable installation compromise.
Frequently Asked Questions
What is the best digital door lock in Singapore in 2026?
The Interlock Mercury X6 is our best overall choice for homeowners seeking a premium smart door lock. It combines palm vein recognition, advanced 3D facial recognition, fingerprint, PIN, RFID card, app access, custom temporary PINs, OTPs, video monitoring, motion detection and mechanical key backup.
What is the best affordable digital lock?
The Interlock Mercury X2 is our best affordable choice. It provides fingerprint, PIN, RFID card and mechanical key access without requiring Wi-Fi, a mobile app or a cloud account.
What is the best cloudless digital door lock?
The Mercury X2 is our best cloudless choice. It operates locally without an app or Wi-Fi connection, and it does not upload access records as cloud-based logs through a connected lock platform.
Is an expensive digital lock always better?
No. A more expensive lock may provide additional biometrics, cameras, temporary access or connected functions, but those features only add value when the household will use them.
A simple offline model can be the better choice for users who prioritise straightforward operation, privacy and lower complexity.
What is the difference between the Mercury X6 and X5?
Both models provide advanced biometrics, temporary access functions and HD camera specifications.
The X6 is the stronger premium option because of its premium aluminium construction, curved ergonomic design, custom temporary PIN control, stronger overall camera colour presentation and more complete flagship entrance experience.
The X5 provides many similar biometric and access-management functions at a lower price, with a slimmer profile and chromium-style outer finishing.
Which digital lock is best for elderly parents?
The Mercury X2 is suitable for elderly users who prefer straightforward app-free operation. RFID card and PIN access can be used when fingerprint recognition is inconvenient.
The Mercury X6 may be better for elderly users with dry or worn fingerprints because it also supports advanced 3D facial recognition and palm vein access.
Which lock is best for a rental property?
The Mercury X5 is our preferred rental-unit model because it supports temporary PIN functions and connected access management at a lower price than the X6.
Which digital lock is best for Apple Home?
The Aqara A100 is the strongest option in this guide for homeowners who prioritise Apple Home, Apple Home Key and Aqara ecosystem integration, subject to the required compatible devices and setup.
What is Interlock DualKey™?
Interlock DualKey™ provides mechanical key access from both the inside and outside of the Mercury G4 gate lock.
The external keyhole provides an additional physical entry option if the homeowner is outside, the battery is flat and emergency electronic power is unavailable or unsuccessful.
Should I choose the Mercury G4 or G3 in a bundle?
Choose the G4 when mechanical backup, lockout assurance and DualKey access from both sides are the main priorities.
Choose the G3 when dual-camera visitor and parcel viewing are more important. The G3 adds a second camera for greater parcel-area visibility but does not provide the G4's external mechanical keyhole.
Can the G3 or G4 camera replace CCTV?
No. Their cameras are useful for entrance viewing, visitor awareness, supported recordings and parcel checking, but they are not designed to provide the same continuous coverage as a dedicated CCTV surveillance system.
Connected viewing also depends on the available Wi-Fi connection, which may be affected by router distance, network settings and metal gate interference.
Where can I compare individual digital gate locks?
For gate-only recommendations, see our separate digital gate lock buying guide.
Do digital locks work during a home power failure?
Digital locks use their own batteries, so a household power failure normally does not prevent the lock from operating. Users should still respond to low-battery warnings and understand the emergency power and mechanical key options for their particular model.
Should I choose fingerprint, face or palm vein recognition?
Fingerprint access is familiar and suitable for many users, but recognition performance can differ according to finger condition, placement and the individual user.
Facial recognition is useful for contactless entry, especially when carrying bags. Palm vein recognition provides another contactless biometric alternative and reduces the household's reliance on fingerprints.
How can I tell whether a digital lock fits my door?
Send full front, rear and side photos of the door, together with close-ups of the existing lock, frame and strike area. Door thickness, previous holes, handle clearance and gate-to-door distance may all affect compatibility.
Can a digital lock replace any existing door lock?
Not always. Previous drilled holes, mortise dimensions, door thickness, frame design and nearby handles can affect whether a new model fits and covers the existing installation area cleanly.
A compatibility assessment should be completed before a model is confirmed.
Final Verdict
The Interlock Mercury X6 is our best overall digital door lock in Singapore for homeowners who want premium construction, advanced biometrics, flexible temporary access, video monitoring and stronger entrance awareness.
It is particularly suitable for multi-generation households because family members are not forced to depend on the same access method. Face, palm vein, fingerprint, PIN, RFID card, app access and mechanical key backup give different users practical alternatives.
The Interlock Mercury X2 is our best affordable and cloudless choice because it provides the access methods most households need without requiring an app, Wi-Fi connection or cloud account.
It is not trying to be the most advanced lock. It is designed to make everyday keyless entry simple, effective and less intimidating for households that do not want connected features.
Choose the Mercury X5 when advanced biometrics, temporary PIN functions and an HD camera matter, but the complete X6 premium experience is not required.
For a complete entrance, choose the Mercury X6 + G4 when maximum backup assurance and DualKey matter most.
Choose the Mercury X6 + G3 when parcel visibility and dual-camera gate monitoring are a higher priority.
The Mercury X2 + G3 provides strong value by combining a simple, private and affordable door lock with a more intelligent dual-camera gate lock.
Ultimately, the best digital lock is not the model with the most features. It is the lock that fits the entrance properly, solves the household's most important access problem and gives every regular user a comfortable and reliable way to enter.
Browse our complete collection of digital locks in Singapore, or contact Interlock and send clear photos of your door and gate for a free compatibility assessment before selecting a model.
Homeowners who already have a suitable door lock and only need to upgrade the gate can refer to our complete guide to digital gate locks in Singapore.