The best alternatives to Gravitus are Gymatic, GymBot, and MoveRite. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Whether it be a powerlifting 5x5 workout or a HIIT workout, Strengthic's flexible set-based workouts allow you to create any workout tailored to your fitness goals. Built in timers, stopwatches, and plate calculators make the process easier and more efficient.