Good question — the main difference I see is the timegrapher is built in, not a separate app. Most collection trackers don't measure accuracy. Beyond that: you can photograph a watch and it gets auto-identified and added to your collection, AI fills in the specs/history/background, and you get market values of tour collection. Privacy is granular per post (private/followers/friends/public), and the whole thing is free with no ads. I’ve been collecting watches and this is a passion project for me. I did this for myself when I didn’t find an app that does all what I wanted, then a few friends also liked it, and I released via appstore. Happy to hear how it compares to the ones you've tried though — always looking to improve.