While i'm all for everything this represents technologically, why isn't this considered cheating?

They are allowed by the poker sites. This is a simple version of PokerTracker/Hold'em Manager. Theres a bunch of others. This is the only one that runs in the browser! (that I know of). I actually want to target the people who don't use trackers and even the playing field a bit.

I was curious why you would attempt this since PT/HM already dominate the market (for a reason) but that's a solid way to differentiate yourself.

I would check it out if I could actually play online anymore.

I wanted to target the casual player who play 1 or 2 tables. Basically someone like me! PT/HM are bit too complicated and overkill (in my opinion at least)

Are the hand histories shared between users or do you only see statistics from hands you have played yourself?

Only yourself. It's a javascript app using the FileReader API, so it doesn't do any server interaction when calculating the stats. Just gets the player ratings from the server.

You will make serious money if you'll release it as a Google Glass app ;)