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Works with Matter

Did I lock the door? Now you can actually know.

That sinking feeling halfway to work, or last thing at night. A reminder app records that you checked - it does not record whether your door is actually locked. Locksure does. Open the app and see locked or unlocked, from anywhere, from £44.99.

Locksure monitors your lock - it shows locked or unlocked. It does not lock or unlock the door.

Checking the door lock from bed at night on a phone See how it works - from £44.99

A reminder tells you to check. Locksure tells you the truth.

A "did I lock it?" appNudges you, or lets you tick a box. But it has no idea whether the door is really locked - it only records that you tapped the screen.
LocksureReads the actual state of your lock and shows it in the app. Locked or unlocked, in real time, wherever you are. No guessing, no going back.

How it works

1. Clip it onFits beside your existing thumb-turn or key-turn in minutes. No drilling, no locksmith, nothing changes on your lock.
2. Pair the appStandard sensor connects via the small hub; the Matter version works in Apple Home, Google Home, SmartThings and Home Assistant.
3. Check anywhereGlance at your phone and see locked or unlocked. Over 2-year battery on the standard sensor. UK-made.
Shop Locksure options

From £44.99 · fits your existing lock · no subscription for core alerts · UK-made

Common questions

How can I check if I locked my door from my phone?

Fit a Locksure monitor beside your existing lock. It reads whether the lock is engaged and shows locked or unlocked in the app, so you can check from anywhere. You do not need a smart lock.

Do I need to replace my lock or door?

No. Locksure clips on next to your current thumb-turn or euro-cylinder key-turn. Your key and lock stay exactly as they are.

Does it work when I am away from home?

Yes. The lock status shows in the app wherever you are, over your home Wi-Fi (standard) or your Matter smart home (Matter version).

Is this different from a door open/closed sensor?

Yes. A contact sensor only tells you the door is open or closed. Locksure tells you whether it is actually locked - and a closed door is not always a locked one. See the full comparison.
Never wonder again - see options