Smart Lock Comparison · UK 2026
Nuki Smart Lock Pro (5th Gen) vs Ultion Nuki 2025

Specs, pros and cons compared side by side

Both the Nuki Smart Lock Pro (5th Gen) and the Ultion Nuki 2025 are smart locks. This head-to-head sets them side by side using the specs, pros and cons from our full reviews. For Ultion support, use Ultion’s contact page. Nuki specs come from Nuki’s own UK pages and help centre; Ultion Nuki specs come from Ultion’s own pages.

Quick verdict

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Nuki Smart Lock Pro (5th Gen)

Pick it for: Fits over your existing Euro cylinder, no cylinder change (the Ultion replaces a push-down handle)

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Ultion Nuki 2025

Pick it for: Replaces a UK push-down handle (the Pro: fits over a Euro cylinder) · Ultion 3 Star PLUS lock, with a BSI Kitemark cylinder (the Pro uses your own cylinder)

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Quick comparison

Spec Nuki Smart Lock Pro (5th Gen) Ultion Nuki 2025
Connectivity Bluetooth, Wi-Fi (2.4 GHz) and Matter over Thread Bluetooth, built-in Wi-Fi and Matter over Thread
Power Built-in rechargeable battery; magnetic charging cable with USB-C plug; about 2 hours; charger not included Built-in rechargeable battery (“up to 9 months” or “several months”, per Ultion); USB-C, about 2 hours
Remote access Included, over built-in Wi-Fi or Thread; no bridge Included over built-in Wi-Fi, no bridge or hub
Door fit Fits over an existing Euro profile cylinder (or selected Swiss round); no cylinder change or drilling UK push-down handles: 215, 211 or 122 mm fixings, 92 mm spindle to keyhole; escutcheon version in the box
Key specs from our review Brushless motor, 3 locking speeds
Under 1.5 s in the fastest mode
Stainless steel, 57 mm diameter, 290 g
Black and white base rings in the box
Key up to 4 mm thick, 37 mm protrusion		 Ultion 3 Star PLUS lock
BSI Kitemark cylinder
Replaces a UK push-down handle
Apple Home, Google Home, Alexa, SmartThings
White, Black or Chrome with Steel
Nuki Smart Lock Pro (5th Gen)

Pros

  • Fits over your existing Euro profile cylinder, with no cylinder change or drilling
  • Remote access included, over built-in Wi-Fi or Thread, with no bridge
  • Brushless motor with three speeds, under 1.5 seconds in the fastest mode
  • Built-in rechargeable battery: about 2 hours to full, on or off the door

Cons

  • It can’t lift the handle: on a lift-to-lock door you lift it yourself before it locks
  • Battery life falls to 4 to 6 months on Wi-Fi, by Nuki’s figures
  • No charger in the box: you need one of at least 10 W
Ultion Nuki 2025

Pros

  • Ultion 3 Star PLUS lock, with a BSI Kitemark cylinder
  • Built-in Wi-Fi with remote access included, and no bridge or hub
  • Matter over Thread with Apple Home, Google Home, Amazon Alexa and Samsung SmartThings
  • Built-in battery that recharges over USB-C in about 2 hours, on or off the door

Cons

  • Can’t lift the handle: on a lift-to-lock door you lift it yourself before Auto Lock, schedules or Night Mode can lock
  • Ultion’s battery figures differ: “up to 9 months” and “several months”
  • Fits only handles with 215, 211 or 122 mm fixing centres and 92 mm from spindle to keyhole

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Which should you buy?

Why choose the Nuki Smart Lock Pro (5th Gen)

  • Fits over your existing Euro cylinder, no cylinder change (the Ultion replaces a push-down handle)
Why choose the Ultion Nuki 2025

  • Replaces a UK push-down handle (the Pro: fits over a Euro cylinder)
  • Ultion 3 Star PLUS lock, with a BSI Kitemark cylinder (the Pro uses your own cylinder)

Related comparisons

Need a hand with this?

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