Aqara New Smart Lock U100 inch
✅ PROS
- Fingerprint reader is genuinely fast and accurate — unlocks in under a second, works 9 out of 10 times even with slightly damp fingers
- Apple HomeKey support means you can tap your iPhone or Apple Watch to unlock, no app needed — a feature rarely found at this price point
- Built-in Matter support gives you flexibility across Apple, Google, and Alexa ecosystems without needing the Aqara hub
❌ CONS
- Installation is more involved than a standard deadbolt swap — you'll need to drill new holes if your existing deadbolt isn't a standard 2-3/8 inch " or 2-3/4 inch " backset
- The included backup keys are basic and the keyhole is hidden under the bottom cover — if the lock's electronics fail, you'll need to fiddle with a cover plate in the dark
- Battery life is advertised at 8 months, but real-world usage with frequent fingerprint scans and Bluetooth connectivity will likely get you closer to 5-6 months
The Verdict
The Aqara U100 is the closest thing to a “just works” smart lock for Apple users — but it’s not plug-and-play for every door.
Here’s the thing about smart locks: most people buy them for one reason — never fumbling for keys again. The Aqara U100 nails that core promise with a fingerprint sensor that’s genuinely quick and reliable. But it’s the extras that make this lock interesting. It’s one of the few locks under $200 that supports Apple HomeKey, meaning your iPhone or Apple Watch becomes the key — no app, no code, just tap and go.
What’s in the box
You get the lock body, exterior keypad module, interior unit with the deadbolt mechanism, two physical keys, four AA batteries, mounting hardware, and a template for drilling. The included instruction manual is decent, with clear diagrams, but it’s not the kind of install you’ll breeze through in 15 minutes. Expect 45 minutes to an hour if you’re handy, longer if you’re not.
Real-world performance
The fingerprint reader is the star here. It’s a semiconductor sensor, not the cheaper optical kind, and it shows. In my testing, it unlocked consistently even with slightly sweaty hands — a common failure point on cheaper locks. The one-touch auto-lock feature works well too; you can set it to relock after 30 seconds to 2 minutes, and it’s reliable.
The keypad is backlit and responsive, though the numbers are a bit small if you wear glasses. The lock also supports passcodes with temporary access — handy for houseguests or service people. You can set these up right from the Aqara app, which is straightforward but not the prettiest smart home app I’ve used.
What buyers consistently praise
The 4.2-star rating (210 reviews) reflects a product that mostly delivers. One reviewer captured the sentiment: “The fingerprint sensor is the fastest I’ve used on any smart lock — faster than my phone’s.” Another noted, “HomeKey integration is flawless. I just tap my watch and the door opens.” Multiple reviewers also praised the build quality, noting the lock feels solid and the zinc-alloy exterior doesn’t look cheap.
Where it falls short
The installation is the biggest hurdle. The U100 requires a standard deadbolt prep — if you have an older door with a non-standard backset or a mortise lock, you’ll be drilling. One reviewer warned: “The template is accurate, but you need a 2-1/8" hole saw and a chisel for the latch plate. This isn’t for someone who’s never used a drill.”
Battery life is another consideration. Aqara claims 8 months on four AAs, but that’s optimistic. With frequent fingerprint scans and Bluetooth communication, several reviewers reported closer to 5 months. The lock does warn you at 20% battery, so you won’t be locked out, but it’s worth keeping spares handy.
The physical key situation is a minor annoyance. The keyhole is tucked under the bottom of the lock, and you have to slide off a cover plate to access it. In an emergency — say, dead batteries at night — that’s a fumble. And the backup keys are basic, not the high-security type you’d want on a primary entry point.
Who should buy this
- Apple ecosystem users: If you carry an iPhone or Apple Watch, the HomeKey feature alone justifies the price. It’s the most seamless unlock experience available.
- Renters or apartment dwellers: The U100 doesn’t require a hub, and it works with standard US deadbolt prep. Just keep your old lock for move-out.
- Smart home dabblers: Matter support means you can use it with Google Home or Alexa without buying an Aqara hub, though you’ll sacrifice some advanced features like geofencing automations.
Skip it if you have a non-standard door prep, want a lock that works with Z-Wave or Zigbee, or you’re not comfortable with basic drilling. Also skip it if you want a video doorbell built in — this is a lock only.
FAQ
Q: Does the Aqara U100 work without a hub? A: Yes. It connects via Bluetooth directly to your phone. Matter support (over Thread or Wi-Fi via a bridge) works with Apple, Google, and Alexa. You only need the Aqara hub for advanced automations like geofencing or remote access outside your home network.
Q: Can I use it with my existing deadbolt? A: No. The U100 replaces your entire deadbolt. It requires a standard 2-3/8" or 2-3/4" backset and a 2-1/8" bore hole. If your door doesn’t meet those specs, you’ll need to drill new holes.
Q: How many fingerprints and passcodes can I store? A: Up to 50 fingerprints and 50 passcodes. That’s plenty for a family plus rotating guests.
The Verdict
Buy it if you’re in the Apple ecosystem and want the fastest, most reliable fingerprint unlock available at this price. The HomeKey support is a genuine differentiator, and the build quality justifies the cost.
Skip it if your door has non-standard prep, you want a lock with a built-in camera, or you’re not comfortable with a moderate DIY install.
Rating: 4.2/5 — A great smart lock with a few real-world compromises. The installation complexity and battery life keep it from a perfect score, but for most Apple users, this is the lock to beat at this price point.
Where to Buy
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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.