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Grain Gym is free to download and use, and there is no subscription. The FAQ has the plain answer.

What's included

  • 13 built-in programs on 11 progression systems
  • 448 exercises, plus your own custom exercises
  • Workout logging with a rest timer, a warm-up calculator and a plate calculator
  • Your own workouts and programs, built in the app or imported from JSON
  • Personal records, per-exercise charts, a history calendar, a consistency score and a body coverage map
  • A full export as JSON or CSV, and an account backup you can restore on a new phone

Coach and Insights

Coach notes, Trend, Goals, Strength Projections, Muscle Analysis and the weekly review are covered on the features page, which also says how they're offered.