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drøn-
On android most rated at 4.8 Watch Accuracy Meter
I don’t have real timegrapher to compare. Just been timeing watch for 24 hours against GMT website and app was very close to that
Seems popular on the webs https://www.watchuseek.com/threads/watch-accuracy-meter-app-on-android.5415487/
https://www.reddit.com/r/watchmaking/comments/11d4u8v/has_anyone_tried_this_mobile_app_compare_to/
Ricochet
Downloaded timegrapher app on my phone and messed a bit at work with.
Results very close to real live situation.
Mido Powerwind COSC, Citizen Promaster full lume from amazon (as per advise on here),
Seiko SPB237 Willard and Seiko spb313 slim turtle, both suck balls big time, never again.