rytmio is described as 'Free habit tracker with a scrollable visual grid. See months of progress at a glance, track intensity levels, and watch your streaks grow. No credit card,
no fuss' and is a Habit Tracker in the office & productivity category. There are more than 50 alternatives to rytmio, not only websites but also apps for a variety of platforms, including Android, iPhone, Android Tablet and iPad apps. The best rytmio alternative is Super Productivity, which is both free and Open Source. Other great sites and apps similar to rytmio are Loop Habit Tracker, Habitica, Lunatask and YA Habit Tracker.