App that tests watch accuracy?

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Is there any app that tests accuracy of a watch? I've seen people using it but any recommendations?
 
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I have been using WatchCheck for my android phone. Works well enough.
 
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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.
Edited:
 
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don't bother. they're like buying a loupe.

you'll drive yourself crazy with them.
 
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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.
 
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I can second WatchTracker for iOS is pretty good.