Eufy Smart Lock C30 Review: A Great Electronic Deadbolt for Under $80

6 min readI’ve tested a lot of really great smart locks on the pricier end (like the Schlage Sense Pro), but the entry-level space has plenty of quality options, too. Between our best smart locks and best electronic deadbolts guides, most of the models I’ve spent time with climb past $200 once you factor in fingerprint readers, cameras, and tap-to-unlock features. I wanted to see how much of that experience carries over to the affordable end, so I picked up the Eufy Smart Lock C30.This smart lock covers the essentials, including a keypad, app control over built-in WiFi, and a physical key as backup. What drew me to it specifically was the built-in WiFi and the physical button keypad instead of a touch screen, which Eufy claims holds up better over time. After a few weeks of living with it, I came away impressed by how much it does for how little it costs. Ahead, I’ll walk through how I tested it, where it shines, and what frustrated me, so you can decide if it’s the right lock for your door.ProsBuilt-in WiFi provides remote control and codes with no hub or bridgeResponsive, backlit physical buttons that are easier to young kids than a touch screenStores up to 100 codes, with permanent, scheduled, and one-time optionsConsNo Apple HomeKit or Matter supportNo fingerprint readerKey SpecsDimensions2.57 x 1.63 x 6.05 in.ConnectivityBuilt-in WiFi (2.4GHz)Battery4 AA (not included), up to 5 monthsAccess CodesUp to 100Security RatingBHMA Grade 3, AES-128 encryptionHow I Tested the C30I installed the C30 on a side door and tested it for two weeks, running it through every lock and unlock method Eufy offers, including the keypad, app over WiFi, voice commands, and physical key. I also set up multiple user codes—a permanent code for me, scheduled codes for recurring visitors, and a one-time code for a delivery. Over those two weeks, I paid attention to the things that matter day to day, like how quickly the keypad and bolt responded, whether the app stayed connected, and how reliably I could lock and unlock the door remotely when I was away from home.The door it’s installed on faces the elements, so weather resistance mattered here. The C30 is rated IPX3 and can survive temperatures down to minus 22 degrees Fahrenheit, and over the two-week testing period, it held up to some rain without any trouble. I also timed the DIY installation against Eufy’s 15-minute claim to see if the no-drill swap really was that quick (spoiler: it was), and I tried the auto-lock timing, the wrong-try lockout, and the anti-peep scrambled passcode.Setup Takes About 15 MinutesThe C30 replaces a standard deadbolt without any required drilling, and Eufy pegs the swap at 15 minutes, which more or less matched how long it took me. It fit my door just fine with the included Eufy deadbolt matching the existing cross bore and backset with no fuss. Setup runs through the Eufy app, which connects to the lock over built-in 2.4-GHz WiFi. There’s no separate bridge or hub to buy, which is a big part of why the C30 is easier to use day to day than a lot of other budget locks.It runs on four AA batteries, which aren’t included, and it’s rated to last up to five months. If the batteries ever die, the physical key still opens the door, and there’s a low-battery indicator that’s supposed to warn you first. I’ve only been using the C30 for a few weeks, so I haven’t been able to test if it does indeed warn you when the batteries are low.Brandon RussellInstallation took 15 minutes, and WiFi connection is a breeze.It Nails the Basics for the MoneyBetween the keypad, app, voice commands, and backup key, there are a variety of methods to unlock the C30. By far the most convenient is a code, which means I can leave the house without carrying my keys. The lock holds up to 100 passcodes, which is more than enough for all my family members and future guests. The buttons themselves have a soft-touch finish, and they’re easy to press with a satisfying click. They’re also backlit, so it’s easy to punch in your code in low light.The tactile feedback of the buttons makes them easy to find and press, especially for my toddler, who sometimes needs a few attempts to unlock touch-screen-equipped models.The everyday features functioned as expected. Auto-lock secured the door behind me on a timer—from 30 seconds up to one hour—which you can also set on a schedule to lock during certain hours. The anti-peep scrambled passcode feature let me pad my real code with random digits. Wrong-try protection reliably locked out repeated bad attempts, and real-time notifications pinged my phone on every lock and unlock, with information about whose code was used. I could also check the lock status and unlock the door remotely from the app while I was away.While the C30 works with Alexa and Google Assistant for voice control and pairs with Eufy’s own doorbells and cameras, it doesn’t support Apple HomeKit or Matter. If your house runs on Apple, or you were counting on Matter to connect everything, this lock may not fit into your setup. For that, Eufy offers the pricier S3 Max, which supports Matter for the lock functions across Apple Home, Google Home, Alexa, and SmartThings (you’ll want a compatible hub for remote control), and adds palm vein recognition and a video screen for seeing who’s at the door.All I really want is app control and a solid keypad, and the C30 nails both. The Eufy app is quick and reliable for locking up or handing out codes remotely, and the keypad has been fast and accurate every time I’ve used it. There’s also a button on the keypad to lock the door instantly, so you don’t have to wait on the auto-lock timer.Brandon RussellThe analog buttons make this lock easy enough to use for my toddler.What Sets It ApartAt $80, the C30 undercuts most WiFi smart locks and still covers the security basics. It’s BHMA Grade 3, which is the entry level of the three residential grades. Your codes are protected with AES-128 encryption, the same standard banks and governments use to scramble sensitive data. It has electromagnetic pulse resistance, so a power surge or electromagnetic spike won’t knock it out. And it uses local storage, which keeps your access logs on the lock itself instead of on a company server in the cloud.It’s priced right alongside the Wyze Auto-Lock Bolt v2, our pick for Best Budget smart lock, though the Wyze has a fingerprint reader, while the C30 doesn’t. The Wyze also features a longer promised battery life (8 months), though it requires eight AA batteries, as opposed to the C30’s four, and its IP53 rating means it offers dust resistance, whereas the C30’s IPX3 rating covers water but leaves dust unrated.On the other hand, the C30 stores up to 100 codes to the Wyze’s 50, which helps when you’re handing out codes to family, guests, and the occasional service visit. And the Wyze uses a touchscreen above its fingerprint reader, while the C30 sticks with physical keypad buttons.The VerdictHaving used plenty of smart locks with fingerprint sensors, facial recognition, palm vein recognition, tap-to-unlock, and walk-up unlocking, I can say the C30 is about as bare bones as it gets, but that’s not necessarily a bad thing. None of those extras is essential, and their absence never got in the way of how I actually lock and unlock my door. The C30 covers the basics—a keypad, app control over built-in WiFi, and a physical key for backup—and does all of it well, for $80.If you mainly want reliable app control and a keypad the whole family can use, the C30 is an easy recommendation. If your home runs on Apple or you’re set on Matter, you might want to step up to the Eufy S3 Max or something in that tier instead. For everyone else, this is a lot of lock for the money.Shop the Eufy Smart Lock C30More Smart Locks We LoveSchlage Encode Smart Wi-Fi Deadbolt Smart LockDesloc C110 Smart LockNow 35% OffLockly Visage Zeno Smart LockBrandon Russell is a freelance writer covering gear and technology. He started his journey as a news writer at a small newspaper and later began reviewing smartphones, movies, and video games. In his free time, he enjoys the slower, more intentional experience of using a 35mm film camera and making short videos about movies he grew up watching.John Gilpatrick is a Senior Reviews Editor for Popular Mechanics, covering tools, home appliances, yard and garden accessories, and smart home tech. He previously worked for Men’s Health and has bylines on numerous other websites, covering topics as disparate as nutrition, tech, and pet care. He is also a former film critic who’s unusually fond of the Star Wars prequels, and he appeared on Pop Culture Jeopardy in 2025 while wearing jorts and a fanny pack. He is a member of the Online Film Critics Society (OFCS).