The Players for PC and Mac are the most feature rich players. They have an almost identical feature set and usage is extremely similar. The few differences are the Mac player lacks some Club Regatta licensed features present on the PC player: the Auto-replay play list and Competitor Schedule.
The in-browser Web player (see tacktracker.com/cloud) shares the same library code as the PC player, but has a simpler user interface designed for immediate use, with no learning curve.
The iPhone and iPad App shares the same library code as the Mac Player, but has a different interface designed for iOS.