Tbh I am a messy person, I trained myself to be organized but I still struggle to not lose my keys and I want something like the apple tag but FOSS, I’ve thought of an ESP32 or ATTINY with a bluetooth module but I don’t think apple uses that? It has to be durable and friendly with LineageOS, samsung stock and my dad lol.
I thought the point of the Apple tag was the gigantic iPhone network tracking where everything is. Yes it uses Bluetooth but the reality proprietary part is on the phones. I believe the spec for the tag itself is public. Do you just want something that beeps when you send a Bluetooth signal?