I've noticed that about new fridges-most of them require a push. That's a step backwards, in my opinion.
I don't use contact, but I do have a hue motion sensor in my freezer door and it's been working great for a couple of years now, I think, on the same batteries.
With the hue,you can use lux, or temperature. I don't use motion, but I guess you could.
Good.
I did my survey of fridge doors a couple times ago at Home Depot. I really think it's weird that the majority don't close by themselves. I'd definitely prefer one that does.
I have contacts inside my garage freezer and fridge and the notification app is simple to use for these notifications. Even have it announcing on my Alexa devices too.
We just got a new refrigerator on Friday, so I have been paying attention to this. Behavior has been good so far. It is a mix of door design and setup. I doubt that the examples on a store floor are setup correctly (biased for gravity).
This seems most likely...even though modern fridges don't lock any more, any airtight box that is large enough for a kid to squeeze into is potentially more dangerous if it closes on its own. I'll take saving one kids life over me having to give my fridge door a push.