Eufy Video Doorbell C31 (with Battery Pack) vs EZVIZ CP4

The EZVIZ CP4, for the door it is built for. It adds an indoor touchscreen chime, a voice changer, a two-year warranty and microSD recording up to 512 GB, all without a subscription. The Eufy Video Doorbell C31 (with Battery Pack) is the sharper of the two at 2K and is the better pick if you want a conventional doorbell and already run Eufy gear.

The shape of the product. The EZVIZ CP4 is a peephole kit that replaces an existing door viewer and puts a screen inside, so it only fits doors that already have a hole. The Eufy Video Doorbell C31 (with Battery Pack) is a normal doorbell camera that mounts beside the door and shoots 2K.

No. Both record locally without a monthly fee, the EZVIZ CP4 to a microSD card of up to 512 GB and the Eufy Video Doorbell C31 (with Battery Pack) to a microSD card of up to 128 GB or a Eufy HomeBase. Cloud storage is optional on both.

Both work with Google Home, Alexa and Home Assistant, and neither supports Apple Home, Matter or SmartThings. Both also connect over 2.4 GHz Wi-Fi only. The EZVIZ CP4 adds a voice changer and Quick Replies are not part of its feature set, while the Eufy Video Doorbell C31 (with Battery Pack) adds automatic replies.

Apartment dwellers whose door already has a peephole and who want a screen indoors, a chime in the box and local recording without a monthly plan, and who can keep the camera on a sheltered door.

Buyers who want a conventional 2K doorbell, the flexibility of a swappable battery or hardwiring, and subscription-free recording, especially if they already own a Eufy HomeBase.