Callus

Forge your fitnessmark by mark

Track anywhere. Own your data. No paywalls, no gimmicks — just a clean, addictively smooth experience that gets you hooked on showing up.

677

Workouts Tracked

903

Hours Logged

Workout tracking made delightful

Logging sets and reps shouldn't feel like a chore. With clean controls and a rewarding sound after every set, tracking becomes something you look forward to, not something to tolerate.

Progress you can feel and see

See your strength evolve across reps, weight, and rest.

Momentum you don't want to break

That feeling when you don't want to break your streak? That's by design. Built to addict you to the process.