Door Locks · Head to head

Eufy Smart Lock C34 vs Eufy Smart Lock E31

Full Smart Door Locks comparison in 2026

Updated October 2026
Data from the official Eufy site.
2026 verdict
For keyless entry that includes a fingerprint, the Eufy Smart Lock E31 is the better smart lock of these two.
Eufy Smart Lock E31
Winner
Eufy Smart Lock E31
$144.99
Buy on Amazon USA
It adds a fast fingerprint reader, a rechargeable 10000mAh battery with USB-C emergency power, Bluetooth alongside Wi-Fi and Thread, and anti-peep passcodes, while keeping the same Matter, Apple Home, Alexa, Google Home and SmartThings support as its sibling. The Eufy Smart Lock C34 is the simpler and less expensive deadbolt: a touchscreen keypad, 8 AA batteries quoted at about eight months, built-in Wi-Fi and the same broad ecosystem support, with no fingerprint. Choose the Eufy Smart Lock E31 if you want fingerprint entry and a battery you recharge, and the Eufy Smart Lock C34 if a keypad deadbolt at the lowest outlay is all you need.
vs
News by email

Still comparing? Get what's new by email

New releases and the smart home news worth knowing, in your inbox.

Smart home news and new releases, straight to your inbox

New releases, comparisons and the smart home news worth knowing.

No spam. Unsubscribe in one click.

Your subscription could not be saved. Please try again.
Please enter a valid email address.
Tick the box above to finish signing up.
We couldn't verify you're human. Please try again.
Too many attempts. Please try again in an hour.
Your subscription has been successful.
FeatureEufy Smart Lock C34Eufy Smart Lock E31Winner
Price$79.99$144.99Eufy Smart Lock C34
Rating2.03.9Eufy Smart Lock E31
Battery Life8 months14 monthsEufy Smart Lock E31
Connectivity2.4 GHz WiFi, Thread Protocol2.4 GHz WiFi, Bluetooth, Thread ProtocolEufy Smart Lock E31
Lock/Unlock SystemRemote, Passcode, Physical KeyRemote, Passcode, Fingerprint, Physical KeyEufy Smart Lock E31
Warranty1.5 years1.5 yearsTie
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie
One-Time PasswordYESYESTie
Periodic PasswordYESYESTie
Emergency FingerprintNONOTie
DoorbellNONOTie

What the differences mean

Fingerprint entry

The Eufy Smart Lock E31 has a fingerprint reader that unlocks in under a third of a second, which is the fastest way in and the feature the C34 does not offer. The Eufy Smart Lock C34 relies on its touchscreen keypad, the app and a physical key.

Battery system

The Eufy Smart Lock E31 uses a built-in 10000mAh rechargeable pack quoted at about 14 months, with USB-C emergency charging if it runs flat. The Eufy Smart Lock C34 takes 8 AA batteries quoted at about eight months and has no backup battery port, so a dead set means replacing cells.

Connectivity

Both connect over 2.4 GHz Wi-Fi and Matter over Thread, but the Eufy Smart Lock E31 adds Bluetooth, which helps during setup and for nearby control. The Eufy Smart Lock C34 is Wi-Fi and Thread only.

Passcodes

The Eufy Smart Lock E31 includes an anti-peep passcode, so random digits can be typed before and after the real code. That option is not documented for the Eufy Smart Lock C34, which supports one-time and periodic codes but leaves anti-peep unlisted.

Door position sensing

The Eufy Smart Lock E31 has no open-door sensor, and its auto-lock runs on a timer that starts after every unlock whether or not the door is closed. The Eufy Smart Lock C34 lists auto-lock after the door is closed, though owners describe it as not verifying that the door is fully shut.

Weather rating and finish

The Eufy Smart Lock E31 is rated IP53 for the exterior assembly. The Eufy Smart Lock C34 has no weather rating documented in this catalog, so an exposed door is a question to settle before buying it.

Which one to buy if

Winner
Eufy

Eufy Smart Lock E31

Prime exclusive deal
$144.99
Buy on Amazon USA
  • + Rating: 3.9
  • + Battery Life: 14 months
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Thread Protocol
  • - Price: $144.99 vs $79.99

What owners say

Owners of both Eufy locks praise the same first two things: a swap onto an existing deadbolt that takes five to fifteen minutes, and a keypad that responds reliably. Eufy Smart Lock E31 owners single out the fingerprint reader, which many call faster than unlocking a phone, the rechargeable pack that ends the cycle of buying AA cells, USB-C emergency power and reliable Siri control through Matter, while a notable subset report the pack lasting only weeks and dying with no warning, with support that did not help. Eufy Smart Lock C34 owners talk about a quiet motor, a keypad that works well for keyless entry and the same broad ecosystem support at a lower outlay, and their complaints are low-battery alerts that do not always fire, no backup battery port, and auto-lock that does not check whether the door is fully shut.

Frequently Asked Questions

Which is better overall: Eufy Smart Lock C34 or Eufy Smart Lock E31?

The Eufy Smart Lock E31 is the better lock overall because it adds fingerprint entry, a rechargeable battery with emergency charging, Bluetooth and anti-peep passcodes on top of the same Matter and ecosystem support. The Eufy Smart Lock C34 is the simpler, less expensive keypad deadbolt.

What is the biggest difference between the Eufy Smart Lock C34 and the Eufy Smart Lock E31?

The way you get in and the way it is powered. The Eufy Smart Lock E31 has a fingerprint reader and a rechargeable 10000mAh pack with USB-C emergency power, while the Eufy Smart Lock C34 relies on a keypad and 8 AA batteries with no backup port.

Does the Eufy Smart Lock C34 have a fingerprint reader?

No. The Eufy Smart Lock C34 unlocks by touchscreen keypad, the app or a physical key. Fingerprint entry is on the Eufy Smart Lock E31.

How long do the batteries last in the Eufy Smart Lock C34 and the Eufy Smart Lock E31?

The Eufy Smart Lock C34 is quoted at about eight months on 8 AA batteries, while the Eufy Smart Lock E31 is quoted at about 14 months on its rechargeable pack. Owners of the E31 report a wide range in practice, including a subset with much shorter life, so the manufacturer figures are a ceiling rather than a guarantee.

Who should buy the Eufy Smart Lock C34?

Buyers who want a straightforward keypad deadbolt with built-in Wi-Fi, Matter and broad ecosystem support at the lowest outlay, and who do not need fingerprint entry.

Who should buy the Eufy Smart Lock E31?

Anyone who wants fingerprint entry, a rechargeable battery with emergency charging, an IP53 exterior rating and the same Matter and Apple Home support, and who is prepared to monitor the charge closely.

AmazonOur store on AmazonShop our ideas on AmazonLists of the smart home setups we would put together ourselves, ready to add to your Amazon cart.Shop on Amazon
Full comparison table

Compare all 54 Door Locks side by side

You are looking at two of them. The full table lines up all Door Locks in the catalog with the same specs, so you can filter by what you need and sort by price or rating.

  • 54 Door Locks
  • 55 specs compared
  • 51 filters
Open the full comparison
More Door Locks

Top Door Locks to compare next

54 smart door locks from 14 brands compared: Aqara, Eufy, Nuki, Schlage and more. Unlock methods, battery life, retrofit fit and app support.

All Door Locks
Eufy

More Eufy products

A sharper look at other Eufy products worth comparing.

Explore Eufy
Independent · Not sponsoredBrands never pay for placement or rankings. Affiliate commissions never influence our comparisons.

As an Amazon Associate I earn from qualifying purchases.

CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.

© 2026 Smart Home Compared
Search