The Smart Lock U100 leads on specs, ahead in 1 of 4 areas.
The Smart Lock U100 wins 2 of the 3 specs where they clearly differ. The Smart Lock U100 costs $120 less. Biggest difference: Thread (No vs Yes).
Not enough data to chart: Access.
Based on 6 and 7 scored specs of 7. Unknown specs are skipped. How we score
Price as of 4 Nov 2026 · amazon.com
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Bolt SE
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Assure Lock 2 Keypad with Wi-Fi
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Encode$229.31
21 specs, grouped by area.
| Fact | Smart Lock U100 | Smart Lock U400 | Margin |
|---|---|---|---|
| Unlock methods Auto-unlock uses your phone's location. Fingerprint and keypad work without a phone, useful for kids and guests. | AppKeypadFingerprintNFCApple Home Key | AppKeypadFingerprintNFCApple Home KeyAuto-unlock | |
| Auto-lock Locks itself after the door closes. Works best with a door sensor. | Yes | Yes | |
| Door sensor Knows if the door is open or closed, not just locked. | ? | Yes |
| Fact | Smart Lock U100 | Smart Lock U400 | Margin |
|---|---|---|---|
| Installation Retrofit locks sit on the inside and keep your existing key. Renters usually want retrofit. | Full lock replacement | Full lock replacement | |
| Lock standard Euro profile cylinders are common in DE, NL, FR and the Baltics. Check the emergency function on your cylinder. | US deadbolt | US deadbolt | |
| Security certification Independent tests such as SKG (NL), VdS (DE) or ANSI/BHMA (US). | Meets BHMA Grade 3 standard (manufacturer statement) | BHMA certified (grade not stated) |
| Fact | Smart Lock U100 | Smart Lock U400 | Margin |
|---|---|---|---|
| Battery life Manufacturer estimate at ~8 operations per day. Wi-Fi locks drain faster than Thread or Bluetooth. | 8 months | 6 months | +33% |
| Battery Rechargeable packs are convenient but the lock is offline while charging unless you have a spare. | AA | Rechargeable pack |
| Fact | Smart Lock U100 | Smart Lock U400 | Margin |
|---|---|---|---|
| Wi-Fi 2.4 GHz has longer range. Dual band helps in crowded apartment buildings. | No | No | |
| Thread Low-power mesh used by Matter. Needs a Thread border router (HomePod mini, Nest Hub, SkyConnect…). | No | Yes | |
| Zigbee Mature mesh protocol. Works locally with Zigbee2MQTT or ZHA in Home Assistant. | Yes | No | |
| Bluetooth Usually only for setup or short-range control. | Yes | Yes |
| Fact | Smart Lock U100 | Smart Lock U400 | Margin |
|---|---|---|---|
| Matter Works with every major platform locally. Check which device types are supported — some features may stay app-only. | Yes | Yes | |
| Home Assistant Core integrations ship with Home Assistant. HACS integrations are community-maintained and can break after updates. | ? | Matter | |
| Alexa | Yes | Yes | |
| Google Home | Yes | Yes | |
| Apple Home | Yes | Yes |
| Fact | Smart Lock U100 | Smart Lock U400 | Margin |
|---|---|---|---|
| Works offline Keeps working with your internet down — schedules, automations and local apps still run. | ? | Yes | |
| Cloud account required You must create a manufacturer account to set it up. Some devices stop working if the cloud shuts down. | No | No | |
| Subscription for key features Features locked behind a monthly fee, e.g. history, AI detection or remote access. | No | No | |
| Firmware updates via HA Update the firmware from Home Assistant without the vendor app (Zigbee2MQTT OTA, Matter OTA). | ? | ? |
