Works with Matter
Kubu Alternative: Door Lock Monitoring That Fits Your Existing Door
Kubu tells you if your door is locked, but it is built around compatible Avantis lock hardware - typically a "Kubu-ready" door or lock - and its premium app features need a subscription. Locksure gives you the same peace of mind on the door you already have. From £44.99, fitted in minutes, no lock swap.
Locksure monitors your lock - it shows locked or unlocked, it does not lock or unlock the door.
Shop Locksure - from £44.99Any door, todayFits beside your existing thumb-turn or euro-cylinder key-turn. Wood, uPVC, composite, aluminium. No new door, no lock replacement.
A fraction of the costMonitor £44.99, starter pack with hub £62.99. No compatible-lock hardware to buy, and no subscription for your core lock alerts.
Fitted in minutesClips on - no drilling, no wiring, no locksmith. Over 2-year battery on the standard sensor (18 months on the Matter version), UK-made, works with Alexa (and Apple Home, Google Home and Home Assistant on the Matter version).
Locksure vs Kubu, side by side
| Locksure | Kubu | |
|---|---|---|
| Fits your existing door? | Yes - almost any door, no changes | Built around compatible Avantis lock hardware - typically factory-fitted or supplied with a "Kubu-ready" door |
| Installation | Minutes, clip-on, no tools | Fitted into the lock/door, typically professional |
| Upfront price | £44.99 monitor / £62.99 starter pack with hub | Sensor plus compatible lock or door |
| Ongoing cost | None for core lock alerts | Premium app features need a paid subscription (Kubu Premium) |
| What it detects | Locked / unlocked, plus door open / closed | Whether the multipoint lock is engaged |
| Battery life | Over 2 years (standard sensor); 18 months (Matter) | Up to 2 years (per Kubu) |
| Smart-home ecosystems | Alexa; Matter version adds Apple Home, Google Home, SmartThings, Home Assistant over Thread | Kubu app (see getkubu.com for current integrations) |
Is Kubu worth it?
If you are already buying a brand-new composite or uPVC door and want the sensor built invisibly into the lock from day one, Kubu is a tidy fit. If you want to keep the door you have and just know whether it is locked, Locksure does that for a fraction of the price, on almost any lock, with no subscription for your core alerts.
Keep your door - see Locksure options
Common questions
Is Locksure a good alternative to Kubu?
Yes - both tell you whether your door is locked from your phone. The difference is Locksure retrofits to your existing lock with no new door and no subscription for core alerts, where Kubu is designed around compatible Avantis lock hardware, typically supplied with the door.
Do I need to change my door or lock for Locksure?
No. Locksure fits next to your current thumb-turn or key-turn. Nothing about your lock changes - it monitors, it does not lock or unlock.
Is there a subscription?
No subscription for your core lock-status alerts. You pay once for the hardware.
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.
See Locksure options
More comparisons: the full comparison matrix · Locksure vs Nuki
Comparison based on publicly available Kubu information, checked August 2026. Kubu is a trademark of its respective owner; this page is an independent comparison and is not affiliated with or endorsed by Kubu.