Online Interval Timer is described as 'Free online interval timer for HIIT, Tabata, EMOM, AMRAP workouts. Customizable work/rest periods, rounds, cycles, and sounds. Works on any device' and is an website in the sport & health category. There are more than 10 alternatives to Online Interval Timer, not only websites but also apps for a variety of platforms, including Android, iPhone, iPad, F-Droid and Android Tablet apps. The best Online Interval Timer alternative is OpenHIIT, which is both free and Open Source. Other great sites and apps similar to Online Interval Timer are TimeR Machine, Workout Time!, Interval Timer (PFA) and Just Another Workout Timer.