1. Aqara U100 — The practical choice that doesn't cost twice what it should
The U100 works with Apple HomeKit, Alexa, and Google Home out of the box, stores 50 fingerprints, and installs on the standard HK 60mm backset mortise prep without new drilling. It runs on four AA batteries for eight months, costs HKD 1,980 at Broadway or Fortress, and doesn't require a proprietary bridge unit that dies two firmware updates later.
Most smart locks sold in Hong Kong either ignore HomeKit (which rules them out for half the flats in Mid-Levels) or charge HKD 3,500+ for the privilege. The U100 does both platforms for less than a Yale standalone fingerprint lock. The fingerprint reader sits where your thumb lands, not two inches too low like the Philips models, and it unlocks in under a second even when your hands are wet from the MTR rain barrier you just walked through.
Installation takes 20 minutes if you're replacing a standard deadbolt. The U100 uses the same two screw holes as whatever generic Häfele lock your building installed in 2015. No drilling, no new striker plate, no calling the management office to ask if modifications are allowed. The interior escutcheon is 65mm wide, which covers the screw holes from most HK builders. If your door has a 90mm backset (common in older Kowloon Tong houses), you'll need the U200 model instead — same price, longer latch.
The app lets you set temporary PINs for cleaners or Lalamove drivers, and the HomeKit integration means you can trigger "I'm home" scenes when you unlock the door (lights on, aircon to 23°C, that sort of thing). The one scenario where this loses: if you want a full colour touchscreen. For that, buy the Kaadas.
Pros
- Works with HomeKit, Alexa, Google without a separate hub
- Fits standard 60mm HK door prep with zero drilling
- Fingerprint reader is fast and placed where your thumb actually lands
- HKD 1,980 — half what Yale charges for fewer features
- Eight-month battery life on four AAs
Cons
- No colour touchscreen (just a numeric keypad)
- NFC cards are 13.56MHz Mifare — you can't clone your Octopus card
- The exterior is plastic, not zinc alloy like the Kaadas
| Unlock methods | Fingerprint (50 max), PIN (6-12 digits), NFC card, app, physical key |
| Smart home | Apple HomeKit, Alexa, Google Home (via Aqara Hub M2 or built-in Thread) |
| Backset compatibility | 60mm standard (U200 model for 90mm) |
| Door thickness | 40-110mm |
| Battery | 4× AA alkaline, ~8 months |
| Emergency power | USB-C port (5V input) |
| IP rating | IP65 (exterior escutcheon) |
| Available at | Broadway, Fortress, HKTVmall |
2. Kaadas K9 — The touchscreen model that looks like it costs twice as much
The K9 has a 4.3-inch colour touchscreen, zinc alloy construction, and a fingerprint sensor that unlocks in 0.3 seconds. It integrates with Tuya (so Alexa and Google work), stores 100 fingerprints, and costs HKD 2,680 at Yata or HKTVmall. If you want a lock that doesn't look like a 2018 office building retrofit, this is it.
The K9 is what people imagine when they think "smart lock" — a big glowing touchscreen, a metal body that sounds solid when you tap it, and a UI that looks like a mid-tier Android phone instead of a vending machine. The screen shows the time, weather, and battery level. You can set custom unlock messages ("Welcome home, Marcus" — I turned that off after two days). The fingerprint reader is a semiconductor sensor, not optical, which means it works when your fingers are damp or slightly dirty.
Installation is straightforward if your door has a standard mortise lock. The K9 includes three latch sizes (60mm, 70mm, 90mm), and the installation video is in Cantonese with English subtitles. The interior deadbolt thumb-turn is metal, not the plastic nonsense Yale uses on the YDM3109. The lock runs on eight AA batteries, and the manufacturer claims 12 months — I've had it installed since March 2025 and the app still shows 68% charge.
The Tuya integration works, but it's not HomeKit. If you've already built your flat around Apple's ecosystem, this will annoy you daily. If you use Alexa or Google, you're fine. The app lets you generate one-time PINs, check unlock history, and set "privacy mode" (which disables the touchscreen and requires a fingerprint or physical key). The one genuine flaw: the screen is bright. At night, unlocking your door lights up the entire hallway like you've triggered a stadium floodlight.
Pros
- 4.3-inch colour touchscreen that doesn't look cheap
- Zinc alloy body — the exterior is metal, not plastic
- Fingerprint unlock in 0.3 seconds (semiconductor sensor, not optical)
- Stores 100 fingerprints and 100 RFID cards
- Includes latches for 60mm, 70mm, 90mm backsets
Cons
- No HomeKit support (Tuya only)
- The screen is aggressively bright at night
- Tuya's cloud service has a history of randomly breaking integrations
| Unlock methods | Fingerprint (100 max), PIN (6-10 digits), RFID card (100 max), app, physical key |
| Smart home | Tuya (Alexa, Google Home via Tuya bridge) |
| Display | 4.3" IPS colour touchscreen |
| Backset compatibility | 60mm, 70mm, 90mm (latches included) |
| Door thickness | 40-120mm |
| Battery | 8× AA alkaline, ~12 months |
| Material | Zinc alloy (exterior), ABS (interior) |
| Available at | Yata, HKTVmall, Taobao (via 4PX) |
3. Yale YDM4115 — The mortise lock for buildings that won't let you replace the cylinder
The YDM4115 replaces the entire mortise lock body, not just the exterior escutcheon, which makes it the only option if your building requires a specific cylinder type or your management office has rules about approved lock brands. It stores 100 fingerprints, costs HKD 2,380 at Fortress, and includes a mechanical key override that uses a standard Yale dimple key — so a locksmith can cut spares.
Most smart locks assume you can swap the exterior hardware and keep the existing deadbolt mechanism. The YDM4115 replaces everything — the latch, the cylinder, the entire lock body. This matters in older HK buildings (anything built before 2010) where the management office maintains a master key system or requires a specific lock brand for insurance reasons. You install the Yale mortise body, and the building's master key still works on the mechanical override cylinder.
The fingerprint reader is reliable. The PIN pad is backlit. The build quality is what you'd expect from Yale — metal components, no flex in the housing, and a satisfying clunk when the deadbolt engages. The lock runs on four AA batteries for about ten months, and there's a 9V emergency jump port under a rubber cover on the exterior.
The YDM4115 is a standalone lock. No WiFi, no app, no smart home integration. You programme fingerprints and PINs by holding the interior button and following the beep sequence. For some people, this is a feature (no cloud service to shut down in 2028, no firmware updates that brick the lock). For everyone else, it's a limitation. You can't generate temporary PINs remotely, you can't check if the door is locked from your office, and you can't trigger HomeKit scenes. If you need smart home control, buy the Aqara. If your building won't let you install anything else, buy this.
Pros
- Replaces the entire mortise lock — works in buildings with master key systems
- Stores 100 fingerprints and 100 PIN codes
- Mechanical key override uses standard Yale dimple keys (locksmith-friendly)
- Ten-month battery life on four AAs
- No cloud service to shut down or subscriptions to forget about
Cons
- Zero smart home integration — it's a standalone lock
- No remote PIN generation or unlock history via app
- HKD 2,380 for a lock with no WiFi feels steep in 2026
| Unlock methods | Fingerprint (100 max), PIN (4-12 digits), RFID card (100 max), physical key |
| Smart home | None (standalone operation) |
| Lock type | Full mortise lock replacement |
| Backset | 60mm (standard HK mortise) |
| Door thickness | 38-55mm |
| Battery | 4× AA alkaline, ~10 months |
| Emergency power | 9V battery jump port (exterior) |
| Available at | Fortress, Broadway, Yale authorised dealers |
4. Philips 9300 — The push-pull lock that costs too much for what it does
The 9300 uses a push-pull handle instead of a thumb-turn deadbolt, which means you unlock with your fingerprint and push the door open in one motion — no second hand needed for bags or strollers. It stores 100 fingerprints, integrates with the Philips app for remote unlock, and costs HKD 3,280 at Broadway. The problem: you're paying a 40% premium over the Aqara for a handle mechanism and an app that's worse than Tuya.
The push-pull handle is convenient. You touch the fingerprint reader, the motor disengages the latch, and you push or pull the door open without rotating a knob. This matters when you're holding a wet umbrella, a toddler, and two bags of Wellcome groceries. The motor is quiet — quieter than the Kaadas — and the action is smooth. The handle is zinc alloy with a matte black powder coat that hides fingerprints better than the brushed steel Schlage uses.
The fingerprint reader is optical, not semiconductor, which means it struggles when your fingers are wet or dirty. The sensor sits 10cm below where your thumb naturally lands, so you have to adjust your grip every time. The Philips app works, barely — it connects via Bluetooth when you're within three meters, and via WiFi (through the optional Philips bridge, sold separately for HKD 680) when you're not. The app UI looks like it was designed in 2019 and never updated. You can generate temporary PINs and check unlock history, but the font size is inexplicably large and the settings menu is three levels deep for no reason.
The 9300 requires a 60mm or 68mm backset mortise lock prep, and Philips sells two versions — one for left-hand doors, one for right-hand. You have to choose at purchase time, and the installation manual is vague about which is which. The lock runs on eight AA batteries for about eight months, which is worse than the Aqara despite costing 65% more. The one scenario where this makes sense: you have young children or mobility issues and the push-pull handle justifies the premium. For everyone else, buy the Aqara and save HKD 1,300.
Pros
- Push-pull handle — no thumb-turn needed, useful with full hands
- Quiet motor (quieter than Kaadas or Gateman models)
- Matte black finish hides fingerprints well
- Stores 100 fingerprints and 100 RFID cards
Cons
- HKD 3,280 for a lock with worse app integration than Tuya
- Optical fingerprint sensor struggles with wet or dirty fingers
- Sensor is placed too low — you have to adjust your grip
- WiFi bridge sold separately (HKD 680) for remote access
- App UI is dated and clunky
| Unlock methods | Fingerprint (100 max), PIN (6-12 digits), RFID card (100 max), app, physical key |
| Smart home | Philips app only (WiFi bridge required, sold separately) |
| Handle type | Push-pull (motorised latch disengagement) |
| Backset compatibility | 60mm, 68mm |
| Door thickness | 40-110mm |
| Battery | 8× AA alkaline, ~8 months |
| Handing | Left-hand or right-hand (choose at purchase) |
| Available at | Broadway, Fortress, Philips authorised dealers |
5. Schlage Encode Plus — The HomeKit lock with WiFi built in (and the price to match)
The Encode Plus has WiFi and HomeKit built into the lock body — no bridge, no hub, no separate radio unit to hide behind your TV cabinet. You install the lock, connect it to your WiFi, and it appears in the Home app as a native device. It costs HKD 3,680 at Apple authorised resellers, supports Siri commands, and works with Apple Home Keys (unlock with your iPhone or Watch via NFC). The catch: no fingerprint reader.
The Encode Plus is for people who've already committed to the Apple ecosystem and will pay extra to avoid adding another app or hub. The lock has a numeric keypad (backlit, easy to read at night) and an interior thumb-turn deadbolt. You unlock with a PIN, the Home app, Apple Home Keys (tap your iPhone or Watch to the lock), or a physical key. The Home Keys integration works well — you hold your iPhone or Watch near the lock, Face ID authenticates, and the door unlocks in under two seconds. This is faster than pulling out a physical key and slightly slower than a good fingerprint reader.
The built-in WiFi connects to 2.4GHz networks (not 5GHz). Setup takes five minutes: install the lock, open the Home app, scan the HomeKit code, enter your WiFi password. The lock appears as a standard HomeKit accessory, so you can trigger automations (lock the door when you leave, unlock when you arrive, send a notification if the door is unlocked after 11pm). The battery is a custom rechargeable pack — not AAs — that charges via USB-C and lasts about six months. When it dies, you get a low-battery warning two weeks in advance, which is more notice than most locks give you.
The Encode Plus fits standard US-style deadbolt preps (60mm or 70mm backset, 54mm or 60mm cross bore). Most HK doors use mortise locks, not deadbolts, which means you'll need to replace the door prep or add a deadbolt adapter plate (available from Hafele or Assa Abloy for ~HKD 400). This is a 90-minute job for a handyman and a deal-breaker for anyone renting. The lock has no fingerprint reader, which feels like an oversight at this price. If you don't care about Apple Home Keys and want a fingerprint sensor, buy the Aqara for half the cost.
Pros
- WiFi and HomeKit built in — no bridge or hub required
- Apple Home Keys support (unlock with iPhone or Watch via NFC)
- Rechargeable battery with two-week low-battery warning
- Native HomeKit accessory with full automation support
- Matte black and satin nickel finishes available
Cons
- HKD 3,680 — nearly twice the Aqara for fewer unlock methods
- No fingerprint reader (PIN, app, or Home Keys only)
- Requires US-style deadbolt prep (most HK doors need adapter plate, HKD 400+)
- 2.4GHz WiFi only (not 5GHz)
| Unlock methods | PIN (6-8 digits), Apple Home Keys (NFC), Home app, physical key |
| Smart home | Apple HomeKit (WiFi built in, no hub required) |
| Battery | Rechargeable lithium-ion (USB-C charge), ~6 months |
| Backset compatibility | 60mm, 70mm (US deadbolt standard — adapter plate needed for HK mortise doors) |
| Door thickness | 35-45mm (US standard) |
| WiFi | 2.4GHz (802.11 b/g/n) |
| Finish | Matte black, satin nickel |
| Available at | Apple authorised resellers, Studio Proper, Expansys |
