None of the dozen or so climbing apps out there are ready for prime time, but the crowd-sourced Bouldr platform has the potential to be. After all, what makes a 5.10 a 5.10 save for some sort of consensus? This GPS-enabled, map-based mobile database has route info on everything from Pain in Uranus (despite its name, a family-friendly bouldering problem in NYC's Central Park) to Paul's Roof (a V9 overhang in Sydney, Australia). The advice, route-finding specifics, and level of detail vary maddeningly—just like the beta from your dirtbag climber pals. Free; iPhone only.