Works with Matter
Nuki Alternative: Know Your Door Is Locked Without a Smart Lock
Nuki's Door Sensor shows open or closed, and it only works paired with a Nuki smart lock - so to know your door is locked, you are buying the lock. Locksure shows locked or unlocked on its own, on the lock you already have, from £44.99.
Locksure monitors your lock - it shows locked or unlocked, it does not lock or unlock the door.
Nuki-level "is it locked?" peace of mind, without the £150+ smart lock.
Shop Locksure - from £44.99Lock status on its ownNo smart lock required. The £44.99 monitor shows locked or unlocked by itself, on your existing thumb-turn or euro-cylinder key-turn.
No motor on your doorLocksure only monitors - nothing replaces or motorises your cylinder. Your key and lock stay exactly as they are.
A fraction of the costMonitor £44.99, starter pack with hub £62.99. Over 2-year battery on the standard sensor. UK-made.
Locksure vs Nuki, side by side
| Locksure | Nuki | |
|---|---|---|
| To know the door is locked | The £44.99 monitor on its own | Needs a Nuki smart lock - the Door Sensor is a smart-lock accessory and does not work on its own |
| Fits your existing lock | Yes - clips beside it, no changes | The smart lock fits over or replaces your thumb-turn / cylinder |
| Motor on your door | No - it only monitors | Yes - it locks and unlocks |
| Typical cost to see lock status | £44.99 monitor / £62.99 starter pack | A Nuki smart lock (typically about £150-£280 UK) plus the Door Sensor (about £40-£58) - prices checked August 2026 |
| Battery life | Over 2 years (standard sensor); 18 months (Matter) | Smart lock: Nuki quotes up to 6-12 months depending on model and connection; recharge or battery swap needed periodically |
| Smart-home ecosystems | Alexa; Matter version adds Apple Home, Google Home, SmartThings, Home Assistant over Thread | Nuki app (with remote access); Matter and HomeKit on newer models |
Want remote unlocking? Buy Nuki. Just want to know it is locked? That is Locksure.
If you want to lock and unlock your door from your phone, let guests in remotely, or have the door unlock as you arrive, Nuki is a proper smart lock and does all of that well. Locksure does not lock or unlock anything. If you simply want to know your existing door is locked, on any lock, for a fraction of the price, that is what Locksure is for.
Keep your lock - see Locksure options
Common questions
Does Nuki tell you if the door is locked?
The Nuki Door Sensor shows open or closed and works only as an accessory to a Nuki smart lock. With the smart lock, the Nuki app does show lock state. Locksure shows locked or unlocked on its own, on your existing lock, with no smart lock needed.Do I need a smart lock to use Locksure?
No. Locksure fits beside your current thumb-turn or key-turn and monitors it. Nothing about your lock changes.Is Locksure cheaper than Nuki?
To know your door is locked, yes - Locksure starts at £44.99, where a Nuki smart lock plus sensor typically costs several times more (prices checked August 2026).Is there an Ultion Nuki alternative that just shows lock status?
Ultion Nuki is a UK bundle of the Ultion cylinder with a Nuki smart lock - a motorised lock. If you only want to know the door is locked, Locksure fits beside your existing Ultion or any euro-cylinder and shows locked or unlocked from £44.99.Will it work with my smart home?
The Matter version connects to Apple Home, Google Home, SmartThings and Home Assistant over Thread. The standard version works with Alexa.UK-made · over 2-year battery on the standard sensor · fits in minutes, nothing changes on your lock
More comparisons: the full comparison matrix · Locksure vs Kubu
Comparison based on publicly available Nuki information, checked August 2026. Nuki is a trademark of its respective owner; this page is an independent comparison and is not affiliated with or endorsed by Nuki.