Gryper

Gryper is an iPhone workout tracker for lifters built around three core features. First, it enables one-tap set logging with weight and reps pre-filled from your plan, alongside a rest timer that starts automatically. Second, it displays a living muscle heatmap that shows which muscles you worked during each session and across the week, graded against MEV (minimum effective volume), MAV (maximum adaptive volume), and MRV (maximum recoverable volume). Third, it tracks strength metrics including estimated one-rep max and session grades compared to your previous eight workouts. The app works fully offline, syncing to your account when you regain internet connectivity, and includes over 170 exercises mapped to 36 muscle groups. Users can export their data as CSV or JSON, import workouts from Hevy, and build custom workout splits that repeat across sessions.