Is there any app that tests accuracy of a watch? I've seen people using it but any recommendations?

 

I have been using WatchCheck for my android phone. Works well enough.

 

warchtracker for iOS ... costs $5

 

Toolwatch

 

I’ve been using Kello. If used properly (silent environment etc.) it’s accurate enough for a first order estimation when purchasing a watch. Don’t expect miracles though: it’s not a replacement for an actual timegrapher for diagnosing problems.

 

I've been using the Time Grapher PC program, works great for my uses.
Direct Link: https://tg.ciovil.li/
Info on WUS: http://forums.watchuseek.com/f6/open-source-timing-software-2542874.html

I used a cheap webcam I had laying around that has a built in microphone. I use a spring clamp to hold it onto the watch. Screen Shot attached.

 

don't bother. they're like buying a loupe.

you'll drive yourself crazy with them.

 

I downloaded one (can’t remember which, but it was recommended here and free) to my iPhone about six months ago. I had previously checked my three watches and knew that one ran consistently at +2, one at +4, and one at +6. According to the app, all were off by several MINUTES per day. After a week of screwing with the app I deleted it and went about my life.

 

For Android I can recommend Atomic Clock & Watch Accuracy Tool (with NTP Time) (download it for free from https://play.google.com/store/apps/...android.apps.atomic_clock_watch_accuracy_tool)

 

Here is what I posted about Hairspring.

https://omegaforums.net/threads/hairspring-timing-app-for-iphones.71478/

 

i am using this https://www.lepsi.ch/watch-scope/ and it works fine

 

I can second WatchTracker for iOS is pretty good.