I’ve owned & played CrazyStone for almost 2 years now. Runs seamlessly on iOS, I’m 7-8 kyu and can beat this app at only 6-7 kyu, no lower, so it’s pretty accurately rated. You set the computers strength by Dan-kyu, so great flexibility. It’s much stronger than me if I “open the throttle” on its engine & if you search YTube, can see older vids of BattsGo Dwyrin, Hajin Lee, Hanayeol, and other high Dan players engaging w CrazyStone. Although one can play bots, like OGS, those require internet or cell connection; CS is a standalone app that can be played anywhere without data connection. Simple setting, saves all your games in sgf, can play human v human if you want to play friend & have no real board or are traveling (train, etc). With SmartGo Kifu moving to new subscription format, CS may be the best one-time paid iOS Go app. I love it. No relationship to game creator, just happy customer.
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