SendView - The best way to track your competitors' email marketing.
Hevy - Simple workout logging, insightful analytics, and a growing community of gym athletes.
Owletter - Keep an Eye on Your Competitors' Newsletters
Strong.app - Strenght training logger.
Competitors App - Competitors App helps marketers monitor their competitors' marketing moves in one place, with very little time investment.
HeroSnatch - User-friendly workout tracker for CrossFit athletes