Works with Matter
Ultion Nuki Alternative: Lock Status Without the Cylinder Swap
Ultion Nuki is really two upgrades in one: your euro cylinder is replaced with Ultion's 3-star cylinder, and a Nuki motorised smart lock goes on the inside. Bundles currently start from around £239 (Go) to £339 (2025 model) on Brisant's site. It is a genuine security-plus-keyless upgrade. But if what you want is simply to know the door is locked - on the cylinder you already have - that is a £59.99 job, not a £239 one.
Locksure monitors your lock - it shows locked or unlocked. It does not lock or unlock the door.
Shop Locksure - from £59.99Keep your cylinderLocksure clips beside your existing thumb-turn or key-turn - including an Ultion cylinder you already own. Nothing is replaced or modified.
No motor, everIt monitors only. No motorised unit on the inside of the door, no charging routine, and nothing that could ever be made to unlock.
A fraction of the costMonitor £59.99, starter pack with hub £79.99. 1.5-year battery on the standard sensor. UK-made, no subscription for core alerts.
Locksure vs Ultion Nuki, side by side
| Locksure | Ultion Nuki | |
|---|---|---|
| What it does | Monitors: locked / unlocked + door open / closed | Actuates: keyless entry, auto-lock, remote unlocking - and upgrades the cylinder to Ultion 3-star |
| Your existing cylinder | Untouched | Replaced with the supplied Ultion cylinder (that upgrade is part of the product) |
| Typical price | £59.99 monitor / £79.99 starter pack | From about £239 (Go) to £339 (2025, with cylinder and handle) - prices checked August 2026 |
| Battery | 1.5 years (standard); 18 months (Matter) | Quoted at several months per charge or set, with a low-battery alert; optional £45 rechargeable pack |
| Ecosystems | Alexa; Matter version adds Apple Home, Google Home, SmartThings, Home Assistant over Thread | Apple HomeKit, Google Home, Alexa and Matter; built-in Wi-Fi on current models |
| Ongoing costs | None for core alerts | No subscription; some models have needed a one-time remote-access activation fee (about £49, paid to Nuki) - check the current bundle |
Upgrading your security anyway? Buy the Ultion Nuki. Just want the answer? That is Locksure.
If your cylinder is old or below 3-star, Ultion Nuki is a smart way to fix two things at once: a snap-resistant Kitemarked cylinder plus keyless entry, with a £5,000 security guarantee behind the cylinder. Locksure is for the other situation - your lock is already good, you just want to stop wondering whether you turned it. One question, answered properly, for £59.99.
Keep your lock - see Locksure options
Common questions
Does Ultion Nuki show if the door is locked?
Yes - it is a motorised smart lock, so the Nuki app knows and shows the lock state. Locksure reads the same answer from the lock you already have, without replacing the cylinder or adding a motor.
Can I use Locksure with an Ultion cylinder?
Yes. Locksure fits beside your existing thumb-turn or key-turn and does not touch the cylinder, so it works alongside an Ultion or any other euro cylinder.
Which is better for a rented home?
A monitor. Replacing a cylinder in a rental normally needs the landlord's permission; Locksure attaches without changing anything and moves with you.
From £59.99 · fits your existing lock · no subscription for core alerts · UK-made
More comparisons: the full comparison matrix · vs Kubu · vs Nuki
Ultion Nuki information based on publicly available sources, checked August 2026. Ultion is a trademark of Brisant-Secure and Nuki of Nuki Home Solutions; this is an independent comparison, not affiliated with or endorsed by either.