eufy smart locks let family, guests, and the dog walker in with their own fingerprint, palm, face, or code, so nobody has to carry or hide a key. Three questions narrow the choice: which door the lock goes on, who will use it, and whether you want a camera at the door.
Which door is the lock for?
Start with the door, because a smart lock replaces the lock that is already on it. If your front or back door has a standard single-cylinder deadbolt, every lock in this collection except the C33 and C32 fits it, since those two replace a door handle instead. If a storm door sits in front of that door, narrow the choice to the eufy Smart Lock C220, C210, or C30, because eufy does not recommend the E34, E40, S3, or S3 Max there: the outer door blocks their palm or face sensor and camera. If your door has a mortise lock, the C220, E40, and E32 list it as not supported, so check the door requirements on the product page before you buy.
How will everyone in your home unlock it?
Next, choose how your family will unlock the door. Almost every eufy smart lock opens with a code, so you can give a guest, cleaner, or dog walker their own code and delete it in the app when they no longer need it. For fingerprint unlocking, choose the eufy Video Smart Lock S330, Video Smart Lock E330, Smart Lock C220, or Smart Lock C33. For palm vein unlocking, which reads the veins under the skin rather than the surface of a finger, choose the eufy FamiLock E34, S3, or S3 Max. For hands-free unlocking, the eufy Smart Lock E40 recognizes your face as you walk up. If no one in your home wants biometrics, the eufy Smart Lock C30 and C210 open with a code, the app, or a key.
Do you want a camera at the door?
Then decide whether the lock should also be your doorbell camera. Among fingerprint locks, the S330 and E330 both have a camera and video doorbell: the S330 comes with an indoor chime, and the E330 connects to Wi-Fi directly without a bridge. The C220 and C33 have no camera. Among palm vein locks, the S3 and S3 Max have a camera and video doorbell, and the S3 Max adds a 4-inch screen inside the door so family can see who is outside without a phone. The E34 has no camera and runs up to 8 months per charge. The face-unlock E40 also has a camera and video doorbell.
