YouTuber Mark Rober just recently released a video where his team built an app that would help them steal the third base coaches signs. If you haven't seen it I encourage you to check it out as it's pretty cool.
That said, the real question is would you as a coach utilize such an app or would you consider it cheating? Personally in my opinion if you're openly relaying signals then it's fair game. Honestly I think it would be easier if coaches just used random words or something like that, it's really the same thing.
I would love to have your feedback either in the comments below here in the blog or on our YouTube video.