30-Second Verdict
| My rating | 8.3/10 |
| Amazon UK rating | 4.1/5 (860+ reviews) |
| Price | £103.57 |
| No drilling? | ✅ Yes |
| Fingerprint? | ✅ Yes |
| App control? | ✅ Yes (with gateway) |
| 5 ways to unlock? | ✅ Fingerprint, passcode, IC card, app, physical key |
| Battery backup | ✅ USB emergency port + physical key |
| Best for | UK renters on a budget who want fingerprint access |
| Not for | People who want built-in WiFi (gateway sold separately) |
Are smart locks worth buying? Yes, if you lose keys often. The Harfo smart lock is one of the cheapest fingerprint locks on Amazon UK. This Harfo Smart Lock Review UK tells you if it’s worth your money.
Why I Wrote This Harfo Smart Lock Review UK
I live in a rented flat in London. I lost my keys three times in one month. A locksmith charged me £120. My landlord was annoyed.
I wanted a smart lock. But I didn’t want to spend £200+ on a lock. I looked for something affordable.
That’s when I found the Harfo smart lock. It costs £103. It has fingerprint, passcode, key, IC card, and app control. Five ways to unlock. No drilling. No permanent changes.
This Harfo Smart Lock Review UK is for renters who want a budget smart lock without spending a fortune.
What Is a Good Smart Lock Brand?
What is a good smart lock brand? There are many. Yale, Nuki, ULTRALOQ, and August are the big names. But they cost £150-300.
Harfo is a lesser-known brand. They make affordable smart locks. The Harfo smart lock is their fingerprint door lock. It costs £103.57 on Amazon UK.
Which brand of door lock is the best? For premium, get Yale. For budget, Harfo is solid.
Who Is This Lock For?
| If you are… | Is this lock for you? |
|---|---|
| UK renter on a budget | ✅ Yes — £103 is affordable |
| Person who loses keys | ✅ Yes — 5 ways to unlock |
| Person who wants fingerprint | ✅ Yes — fingerprint sensor included |
| Person who wants app control | ⚠️ Yes, but needs Harfo gateway (sold separately) |
| Person with 35-55mm doors | ✅ Yes — fits standard UK doors |
| Person on a very tight budget | ✅ Yes — cheapest fingerprint lock |
This Harfo Smart Lock Review UK is for renters who want a smart lock without breaking the bank.
What’s in the Box?
| Item | Description |
|---|---|
| Harfo Smart Lock | Fingerprint + keypad + IC card reader |
| 2 physical keys | Backup keys for emergencies |
| IC cards (2) | Tap to unlock |
| Mounting screws | For installation |
| Installation guide | Instructions |
| Batteries | 4 AA batteries included |
Note: Harfo gateway is sold separately. You need it for app remote access.
Installation — Can a UK Renter Do It?
Yes. No drilling. 10 minutes.
How to install Harfo smart lever door lock?
| Step | What to Do |
|---|---|
| 1 | Remove your existing lock handle — keep it safe |
| 2 | Install the new lock — fits standard 35-55mm doors |
| 3 | The handle is reversible — works for left or right-handed doors |
| 4 | Insert 4 AA batteries |
| 5 | Set up fingerprint, passcode, and IC cards |
| 6 | Test the lock |
When you move out: Remove the lock (5 minutes). Put the old handle back. Your deposit is safe. Your landlord will never know.
No drilling. No locksmith needed. Just a Phillips screwdriver.
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5 Ways to Unlock
The Harfo smart lock offers 5 ways to unlock:
| Method | How It Works |
|---|---|
| Fingerprint | Place finger on sensor — unlocks in under 1 second |
| Passcode | Enter 4-8 digit code on keypad |
| IC Card | Tap the card on the reader |
| App | Unlock remotely (with Harfo gateway) |
| Physical key | Emergency backup — use if battery dies |
Can a smart door lock be hacked? Very unlikely. Fingerprint data is stored locally. No cloud storage.
Fingerprint Sensor — How Fast Is It?
The fingerprint sensor works well. Place your finger on the sensor. The door unlocks in under 1 second.
Accuracy: 9 out of 10 times. Sometimes wet or dirty fingers fail. Same as any phone fingerprint sensor.
How many fingerprints? Up to 300 users. Enough for family, friends, and guests.
How do you change the 4 digit code on a keypad lock? Follow the manual. It takes 30 seconds. Simple.
Passcode — Anti-Peep Technology
The keypad has anti-peep technology. You can enter random digits before your real code. Someone watching won’t know your real code.
Example: If your code is 1234, you can enter 89123456. The lock still unlocks.
This is a smart security feature. It protects against shoulder surfing.
IC Cards — Perfect for Guests
The lock comes with two IC cards. You can tap the card to unlock the door.
Why use IC cards?
- Give to guests or cleaners
- No need to share passcode
- Easy to revoke access
How do I reset a Harfo lock? The manual explains the process. Usually a few button presses.
App Control — Remote Access
The Harfo smart lock works with the Harfo app. But you need the Harfo gateway (sold separately) for remote access.
What you can do with the app:
- Lock/unlock from anywhere
- Create codes for guests
- See access logs
- Set auto-lock
How do I unlock my smart lock? Use fingerprint, passcode, IC card, app, or physical key.
Battery Life and Backup
The lock runs on 4 AA batteries. Battery life is around 6-8 months.
What happens when the battery dies?
- Low battery alert in the app
- Use the physical key to unlock
- Use the USB emergency port (power bank)
What happens to smart locks when power goes out? The lock runs on batteries. It still works. Remote access needs internet.
Security — What Are the Disadvantages of Smart Door Locks?
What are the disadvantages of smart door locks? Here’s the honest list:
| Disadvantage | How Harfo Handles It |
|---|---|
| Batteries die | Physical key + USB emergency port |
| Can be hacked | Very unlikely. Local storage. |
| Higher cost | £103 — cheaper than most |
| Learning curve | Simple setup, easy to use |
| Gateway needed for app | Sold separately |
Are smart locks worth buying? Yes, if you lose keys often. Harfo is affordable and reliable.
Are smart locks secure in the UK? Yes. Bank-level encryption. Local fingerprint storage.
What locks do police recommend? For physical security, BS3621 locks. Harfo works with your existing deadbolt.
Harfo vs LOCKSTAR vs ULTRALOQ vs TEEHO — Comparison Table
| Feature | Harfo | LOCKSTAR | ULTRALOQ | TEEHO |
|---|---|---|---|---|
| Price | £103 | £174 | £148 | £45 |
| Fingerprint | ✅ | ✅ | ✅ | ✅ |
| 5 unlock ways | ✅ | ❌ | ❌ | ❌ |
| Built-in WiFi | ❌ (needs gateway) | ❌ (needs bridge) | ✅ | ❌ |
| No drilling | ✅ | ✅ | ✅ | ✅ |
| User capacity | 300 | 100 | 50 | 50 |
| IC cards | ✅ | ❌ | ❌ | ❌ |
| Best for | Budget, value | Fingerprint + WiFi | Fingerprint + WiFi | Ultra-budget |
For most UK renters, the Harfo smart lock is best if you want a budget fingerprint lock. For ultra-budget, get TEEHO. For built-in WiFi, get ULTRALOQ.
Pros and Cons — Honest List
What I Liked (Pros)
- Affordable — £103.57. One of the cheapest fingerprint locks.
- 5 ways to unlock — Fingerprint, passcode, IC card, app, physical key.
- No drilling — Fits standard doors. 10-minute installation.
- Anti-peep technology — Protects your passcode.
- 300 user capacity — Enough for family, guests, and cleaners.
- USB emergency port — Power bank can unlock if batteries die.
- Reversible handle — Works on left or right-handed doors.
- Physical key backup — If batteries die, use the key.
What I Did Not Like (Cons)
- Gateway sold separately — Remote access needs extra £20-30.
- No built-in WiFi — App only works within Bluetooth range without gateway.
- Brand not as trusted — Harfo is not Yale or Nuki.
- Fingerprint can fail — Wet/dirty fingers sometimes don’t work.
- App is basic — Does the job but not premium.
- Keypad visible from outside — Landlord might notice.
UK Renters — Should You Buy This Lock?
This Harfo Smart Lock Review UK is for renters who want a budget smart lock.
| If you want to secure… | Verdict |
|---|---|
| Front door (budget) | ✅ Yes — £103 is affordable |
| Front door (strict landlord) | ✅ Yes — no drilling, removable |
| Keyless entry | ✅ Yes — fingerprint, passcode, IC card |
| Remote access | ⚠️ Yes, but need gateway sold separately |
| Premium brand | ❌ No — get Yale or Nuki |
Landlord friendly? Yes. No drilling. No permanent changes. Removable.
Will your landlord know? The keypad is visible from outside. If your landlord is strict, ask first.
Deposit safe? Yes. 5-minute removal. Original handle goes back.
Frequently Asked Questions — UK Renters
Are smart locks worth buying?
Are smart locks worth buying? Yes, if you lose keys often. The Harfo smart lock is affordable and reliable. It saves you locksmith fees.
What are the disadvantages of smart door locks?
What are the disadvantages of smart door locks? Battery changes, higher upfront cost, potential tech issues. Harfo specifically needs a gateway for remote access.
Can a smart door lock be hacked?
Can a smart door lock be hacked? Very unlikely. Fingerprint data is stored locally. No cloud storage.
What locks do police recommend?
What locks do police recommend? For physical security, BS3621 locks. Harfo works with your existing deadbolt.
What happens to smart locks when power goes out?
What happens to smart locks when power goes out? Harfo runs on batteries. It still works. Remote access needs internet.
How do you reset a Harfo lock?
How do you reset a Harfo lock? Press and hold the reset button on the back panel for 5 seconds. Follow the manual for exact steps.
How do I unlock my smart lock?
How do I unlock my smart lock? Use fingerprint, passcode, IC card, app, or physical key.
Which brand is best for smart locks?
Which brand is best for smart locks? For premium, Yale and Nuki. For budget, Harfo and TEEHO.
Are smart locks secure in the UK?
Are smart locks secure in the UK? Yes. Bank-level encryption. Physical key backup.
What is a good smart lock brand?
What is a good smart lock brand? For budget, Harfo is a solid choice. For premium, Yale and Nuki.
Final Verdict — Worth Buying or Not?
After testing this lock on my flat door, here is my honest Harfo Smart Lock Review UK bottom line.
Score: 8.3 out of 10
Why 8.3 and not higher?
- Gateway sold separately (-0.5)
- No built-in WiFi (-0.5)
- Brand not as trusted (-0.3)
- App is basic (-0.4)
Why 8.3 is still good?
- Affordable — £103
- 5 ways to unlock
- No drilling — landlord friendly
- 300 user capacity
- Physical key backup
- USB emergency port
- Good value for money
Would I buy it again? Yes, if I was on a budget.
Would I recommend it to another UK renter? Yes, especially if you want fingerprint access without spending £150+. If you want built-in WiFi, get ULTRALOQ. If you want premium brand, get Yale.
Where to Buy in the UK
Amazon UK is the best place to buy:
| Detail | Info |
|---|---|
| Price | £103.57 |
| Rating | 4.1/5 (860+ reviews) |
| Bundle includes | Harfo smart lock + 2 keys + 2 IC cards + batteries + mounting kit |
| Note | Harfo gateway sold separately for remote access |
Disclaimer: I paid for this lock with my own money. No free product. No sponsored content. This Harfo Smart Lock Review UK is just honest experience from one UK renter to another.
Last updated: June 2026. Prices subject to change. Check Amazon UK for current pricing.
