If you're tired of sending endless texts, emails, or tweets to all of your friends just to find out what they're doing tonight, then Wendr is the perfect app for you. Founded by Sam Zises and Nick Kaye, Wendr makes it easy to discover what your friends will be up to when the sun goes down, find new and interesting stuff to do, as well as let your pals know if you're going out, open to suggestions, or staying in for the night. You can group your friends into crews and control who sees your plans. For example, if you're going to a party but don't want your co-workers to know, just set your visibility to your best buds. Wendr only focuses on your plans for tonight, so everything resets automatically at 6 am. Currently compatible with just the iPhone, the app recently won Thrillist and Samsung's Speed Dating for Startups competition.