Blink's person detection works well enough, but it's a subscription-only feature.
CNET/Tyler LacomaResolution and view
We always pay attention to resolution and field of view for home security cameras. Checking detail, up close and at a distance, is very important for live views and the quality of recorded video. It's important to pay attention not only to resolution numbers and how wide the field of view is but if a brand locks higher resolutions behind a subscription (some do).
Video storage
Video storage refers to how easily video can be recorded and shared, typically either in the cloud or locally through an attached hub/hard drive. Cloud storage is almost always locked behind a subscription except in rare exceptions like Google Nest and some others. Local storage is generally a better way to avoid subscriptions and still get this important quality of life.
Smart home integration
Smart home support for voice assistants (Siri, Alexa, Google Assistant) or platforms like Google Home or Apple Home aren't often locked behind subscriptions: What you see in the specs is what you get. That can be limited to a single platform (Amazon likes to keep its devices focused on Alexa for now) or spread out between several platforms. If you already use a voice assistant or a full smart home security system, look for a cam that's compatible with it.
Object detection
Object detection, like recognizing packages or human-shaped beings approaching, is another feature often locked behind a subscription. Some cameras offer free object detection. Eufy uses human detection for many of its cams, TP-Link Tapo cams offer some free detection and several Lorex cams provide package and people detection.
App usability
High-quality secure cams come with apps that are intuitive with settings that are easy to manage. It's also a big bonus if they don't have constant pop-ups telling you to sign up for a subscription.
Night vision
We always take a close look at night vision and its distance to make sure that it's working properly and offers plenty of utility for capturing images on the other side of your yard or room.
Two-way audio
Two-way audio features help scare away intruders, talk to strangers or tell the kids to get inside for dinner. They're always free, but we take a close look at their quality and range, too.