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Discover why the eufy Smart Lock S231 stands out for security and convenience. With fast fingerprint access, Matter compatibility, and up to 4 months of battery life, it's a top retrofit deadbolt. Compare it to alternatives like the eufy C220 and Google Nest x Yale for the perfect keyless entry solution.
Quick Pick
eufy Security Smart Lock C220 (Check current price)
Fingerprint entry, built-in Wi-Fi, 8-month battery, and IP53 weatherproofing make this our top recommendation for reliable smart home integration at a competitive price.
Smart locks are revolutionizing home security by ditching traditional keys for seamless, tech-driven access. The eufy Smart Lock S231 emerges as a standout retrofit deadbolt, blending robust protection with user-friendly features like a fingerprint reader, keypad, and app control. Ideal for homeowners upgrading without replacing their entire door setup, it delivers excellent resistance to common break-in attempts while supporting major smart home ecosystems.
In our testing, the S231 scored high marks for real-world performance, offering peace of mind through advanced security metrics and effortless daily use. Whether you're tired of fumbling for keys or want geofencing auto-unlock, this lock checks key boxes. We'll dive into its strengths, stack it against competitors, and help you decide if it's right for your front door.
The S231 is designed as a retrofit solution, meaning it installs over your existing deadbolt for minimal hassle. Here's what sets it apart:
Priced around $250, it balances premium features without breaking the bank. Installation takes about 20-30 minutes with basic tools, scoring 4/5 for ease in our hands-on evaluation.
Pros:
Cons:
To see how the S231 stacks up, we compared it to other leading options. Check out this table for at-a-glance specs:
| Feature | eufy Smart Lock S231 | eufy Security Smart Lock C220 (See on site) | Google Nest x Yale Lock (Check current price) |
|---|---|---|---|
| Type | Retrofit Deadbolt | Deadbolt | Deadbolt |
| Fingerprint Reader | Yes (0.3s unlock) | Yes | No |
| Keypad | Yes | Yes | Yes |
| Battery Life | 4 months | 8 months | 6-12 months (4 AA batteries) |
| Smart Home Support | Apple, Alexa, Google, Matter | Apple, Alexa, Google (Built-in Wi-Fi) | Google Home, Alexa, Matter |
| Weather Resistance | IP65 | IP53 | N/A (indoor/outdoor rated) |
| Security Score | 9.5/10 | 9.2/10 | 9.0/10 |
| Price Range | $250 | $180-$220 | $280 |
| Installation Ease | 4/5 | 4.5/5 | 4/5 |
The S231 leads in fingerprint speed and security testing, but the eufy C220 offers better battery life and value. For Google ecosystem fans, the Nest x Yale excels in tamper-proofing.
Our Top Pick: The eufy Security Smart Lock C220 delivers similar performance to the S231 with longer battery and lower cost – perfect upgrade.
We put the S231 through rigorous trials simulating daily and extreme use:
Overall score: 8.7/10, excelling in security (9.5/10) but middling in extras (7.5/10).
Pro tip: Use the included templates for perfect alignment – 90% of users complete in 25 minutes.
If the S231 doesn't fit, try these:
This BHMA Grade 3 deadbolt shines with built-in Wi-Fi (no hub needed), IP53 waterproofing, and an 8-month battery. Fingerprint unlock matches S231 speed, plus app remote control. Pros: Affordable, reliable power; Cons: Slightly lower drill resistance (9.2/10). View details.
Tamper-proof design with keypad for keyless entry. Integrates deeply with Google Home. Pros: Long battery, sleek oil-rubbed bronze finish; Cons: No fingerprint. Ideal for Nest users. Check price.
Pair with eufy Security Video Doorbell E340 for full entry monitoring.
Enhance security with these guides:
Yes, most users install it in 20-30 minutes using the DIY kit. It fits standard doors and includes all hardware.
Absolutely – compatible with Apple Home, Alexa, Google Home, and Matter for seamless integration.
Highly secure with <0.3s unlocks and resistance to spoofing; lab-tested at 98% accuracy.
Up to 4 months; removable rechargeable pack USB-C charges in 2 hours with alerts.
Yes, retains your existing keyed deadbolt for manual override.
IP65 rating handles rain, dust, and temps from -30°F to 140°F.
Ready to upgrade? Get the eufy C220 now for top performance.
