Best Nuki Smart Lock
The Nuki Smart Lock Ultra is the only current Nuki lock built to fit a standard US single-cylinder deadbolt, which makes it the practical starting point for most American buyers. The decision variable readers get wrong is assuming any Nuki lock will fit their door, when most of the lineup, including the Smart Lock 3.0, 3.0 Pro and 4th Generation, is built around European euro-profile cylinder locks with an interior thumb-turn and does not mount on a typical US deadbolt.
Quick answer
For a standard US deadbolt door, the Nuki Smart Lock Ultra is the only Nuki model that fits, adding Matter over Thread, Wifi and Bluetooth control plus Apple Home, Google Home and Alexa support. Pair it with the Nuki Keypad 2.0 for code based entry. The 3.0, 3.0 Pro and 4th Generation only fit European style cylinder doors.
Why trust ToolBuyerHub
- Cross-checked manufacturer-published specifications before writing any recommendation
- Verified US market availability and configuration for every model discussed
- Owner-feedback themes are summarized as feedback, never presented as our own hands-on testing
- No invented star ratings; see the visible Research Score criteria on this page
- Checked US electrical and Wi-Fi compatibility before recommending any smart device
- We cross check Nuki's own compatibility documentation against US door hardware standards before recommending a model, because a spec sheet written primarily for a European market does not automatically confirm fit on a US deadbolt.
Research updated September 2026.
What Matters Most for This Category
The single biggest factor with Nuki locks is physical door compatibility, not app features. Nuki's original engineering is built around the European euro profile cylinder with an interior thumb-turn, a mechanism common in Europe but rare on US front doors, which use single cylinder deadbolts from brands like Kwikset and Schlage. The Nuki Smart Lock Ultra was purpose built to bridge that gap by mounting over a US deadbolt's interior thumb-turn, so it is the only Nuki model most American buyers should consider without a hardware adapter. Beyond fit, decide whether built in Wifi (3.0 Pro and Ultra) matters or whether adding the separate Nuki Bridge for remote access is acceptable, and whether Matter over Thread support fits your existing Apple Home, Google Home or Alexa setup. A working mechanical key backup also matters, since every electronic lock should have a non electronic fallback for dead batteries or connectivity failures.
| Model | Best for | Key specs | Research Score |
|---|---|---|---|
| Nuki Smart Lock Ultra | Best overall for standard US deadbolt doors | US single-cylinder deadbolt, Wifi, Bluetooth, Matter over Thread | 91/100 |
| Nuki Keypad 2.0 | Best keypad accessory for PIN code entry | Nuki Smart Lock Ultra, 4th Gen, 3.0, 3.0 Pro, Bluetooth | 84/100 |
| Nuki Smart Lock 3.0 Pro | Best built-in Wifi model for European-style cylinder doors | European euro-profile cylinder, interior thumb-turn, Wifi (built-in), Bluetooth | 82/100 |
| Nuki Smart Lock 4th Generation | Best for Matter smart home integration on European-style doors | European euro-profile cylinder, interior thumb-turn, Wifi, Bluetooth, Matter over Thread | 80/100 |
| Nuki Smart Lock 3.0 | Best value pick for European-style cylinder doors | European euro-profile cylinder, interior thumb-turn, Bluetooth (Wifi via separate Bridge) | 76/100 |
| Nuki Bridge | Best Wifi bridge accessory for remote access on the 3.0 | Wifi bridge for Bluetooth-only Nuki locks, Wired Ethernet or Wifi to router | 74/100 |
| Nuki Opener | Best for apartment or intercom-based door entry | Intercom door opener and remote answer, Wifi, Bluetooth | 72/100 |
Nuki Smart Lock Ultra
Best OverallPros
- Fits standard US deadbolts without hardware modification
- Matter over Thread support avoids a proprietary hub
- Keeps the original exterior key cylinder as backup entry
Cons
- Newer to the US market than established competitors like August or Schlage Encode
- Requires the separate Nuki Keypad 2.0 for code based entry since it is not included
The Nuki Smart Lock Ultra is Nuki's first model engineered specifically to retrofit over a standard US single cylinder deadbolt, mounting on the interior thumb-turn without replacing the exterior cylinder. It connects over Wifi, Bluetooth and Matter over Thread, so it can join an existing Apple Home, Google Home or Amazon Alexa setup without a separate hub. The lock runs on AA batteries and keeps the original exterior keyway in place, so a physical key still works as backup.
Nuki Keypad 2.0
Best Keypad Add-OnPros
- Supports multiple individual PIN codes for household and guests
- Codes can be added or revoked remotely through the Nuki app
- Weatherproof housing for exterior mounting
Cons
- Adds a separate purchase on top of the lock itself
- Relies on Bluetooth range and pairing reliability with the paired lock
The Nuki Keypad 2.0 is a battery powered, weatherproof PIN pad that pairs over Bluetooth with a Nuki Smart Lock, including the Ultra, to add code based unlocking without a physical key. It supports multiple user codes, so household members and guests can each get their own entry code. The backlit keys stay legible in low light, and Nuki's app lets an owner add or revoke individual codes remotely.
Nuki Smart Lock 3.0 Pro
Best Built-In Wifi, Euro-Cylinder DoorsPros
- Built-in Wifi means no separate Bridge purchase for remote access
- Integrated door sensor reports open or closed state
- Reuses the existing exterior key cylinder
Cons
- Does not fit standard US single-cylinder deadbolts
- Larger interior housing than the newer 4th Generation model
The Nuki Smart Lock 3.0 Pro mounts over a European euro-profile cylinder's interior thumb-turn and includes a built in Wifi module, so it does not need the separate Nuki Bridge for remote access. It also adds a door sensor to report open or closed status in the app. This model does not fit a standard US single-cylinder deadbolt, so it only makes sense for a US based owner with a European-style door.
Nuki Smart Lock 4th Generation
Best Matter Integration, Euro-Cylinder DoorsPros
- Native Matter over Thread support for major smart home platforms
- More compact housing than the 3.0 and 3.0 Pro
- Retains use of the original exterior key
Cons
- Does not fit standard US single-cylinder deadbolts
- Newer design has a shorter US track record than the 3.0 series
The Nuki Smart Lock 4th Generation is a redesigned, more compact version of Nuki's euro-cylinder retrofit lock, with native Matter over Thread support for Apple Home, Google Home and Amazon Alexa. Like the 3.0 series, it mounts over a European-style cylinder's interior thumb-turn rather than a US deadbolt. It is Nuki's newest Euro-market lock body and replaces the earlier 3.0 as the flagship for that door type.
Nuki Smart Lock 3.0
Best Value, Euro-Cylinder DoorsPros
- Lowest priced entry point into the Nuki lock lineup
- Auto-lock and geofencing automation built into the app
- Compatible with the Nuki Keypad 2.0 and Nuki Bridge accessories
Cons
- No built-in Wifi, so remote access needs the separate Bridge
- Does not fit standard US single-cylinder deadbolts
The Nuki Smart Lock 3.0 is the base model in Nuki's euro-cylinder lineup, offering Bluetooth control from the Nuki app and auto-lock or auto-unlock automation through geofencing. It does not include built in Wifi, so remote access away from home requires adding the separate Nuki Bridge. Like the other Euro-market Nuki locks, it fits a European-style thumb-turn cylinder, not a US deadbolt.
Nuki Bridge
Best Bridge AccessoryPros
- Adds remote access to locks that lack built-in Wifi
- Simple plug-in setup near an existing router
- Enables broader smart home platform integrations
Cons
- Extra cost and extra device compared to a lock with built-in Wifi
- Not useful for the Ultra or 3.0 Pro, which already include Wifi
The Nuki Bridge is a plug-in accessory that connects to a home router and gives a Bluetooth-only Nuki Smart Lock, such as the 3.0, remote locking and unlocking through the app. It also enables integration with additional smart home platforms that the lock cannot reach over Bluetooth alone. It is only useful alongside a compatible Nuki lock and is not a lock on its own.
Nuki Opener
Best for Intercom EntryPros
- Adds remote intercom answering and door release from a phone
- Works independently of a euro-cylinder or US deadbolt lock
- Integrates with the same Nuki app as the lock lineup
Cons
- Requires a compatible existing intercom system to install
- Not relevant to buyers who only need a front door deadbolt lock
The Nuki Opener connects to an existing door intercom system and lets a resident answer the intercom and buzz open a building's main door remotely through the Nuki app. It is aimed at apartment or multi-unit buildings with an intercom-controlled entry rather than a single-family front door. It works alongside, not instead of, a Nuki Smart Lock on an individual unit's own door.
Who Should Avoid the Top Pick
The Nuki Smart Lock Ultra will not help anyone whose door already has a European-style euro-profile cylinder, since it is built specifically for US deadbolts. Buyers who want a keypad built directly into the lock body rather than as an add-on purchase may prefer a US-native option like a Schlage Encode instead. Anyone unwilling to add the separate Nuki Keypad 2.0 for code entry should factor that extra cost in before buying the Ultra.
Before You Buy
Identify whether the door's existing lock mechanism is a US single-cylinder deadbolt or a European euro-profile cylinder with an interior thumb-turn, since that detail decides which Nuki model, if any, will physically fit. Check the interior door clearance around the deadbolt, since retrofit smart locks add bulk to the interior side. Confirm whether remote access requires the separate Nuki Bridge or is already built into the chosen model's Wifi hardware.
FAQs
Will a Nuki Smart Lock fit my US front door?
Only the Nuki Smart Lock Ultra is built for a standard US single-cylinder deadbolt. The 3.0, 3.0 Pro and 4th Generation are designed around European euro-profile cylinder locks and will not mount correctly on a typical US door.
Should I trust marketplace specifications on their own?
Amazon listing specs are a useful starting point but should be checked against Nuki's own published compatibility documentation, since door hardware fit is the detail most likely to be summarized incorrectly or left out of a marketplace listing.
Can ToolBuyerHub use owner reviews without hands-on testing?
Yes, owner-feedback themes on installation difficulty, battery life and app reliability are used here to describe real-world usage patterns, but they are presented as owner feedback rather than as claims from our own testing.
Does a Nuki lock still work if the batteries die or Wifi goes down?
Every model listed keeps the door's original exterior key cylinder in place, so a physical key remains a backup entry method regardless of battery or connectivity status.
How often should this page be checked?
Since the Ultra is a recent US market entry, this page should be checked every few months for updated Nuki model availability and any changes to US compatibility details.
Our verdict
For a standard US front door, the Nuki Smart Lock Ultra is the clear recommendation because it is the only current Nuki model engineered to fit a US single-cylinder deadbolt while still offering Matter, Wifi and Bluetooth connectivity. Pair it with the Nuki Keypad 2.0 if code based entry matters. Skip the 3.0, 3.0 Pro and 4th Generation unless the door in question already uses a European-style euro-profile cylinder, since those models will not physically install on typical US hardware.