Adults who want a light, low-maintenance way to notice variety across strength workouts without turning exercise into a complex training plan.
MettleKin
Raise Crystallin through five permanent illustrated mineral stages from a character-first home, run reusable local workout routines, track balanced progress across seven major and twenty-one supporting muscle groups, choose a Bodybuilder or Athletic final form at Stage 5, and optionally keep a simple daily calorie total without an account or subscription.
USD 9.99one-time paid download
Local-only with no account, tracking, analytics, ads, or developer-operated serverMettleKin stores the Crystallin profile and final-form preference, equipment choices, saved workout routines, active routine state, workout entries, motivational muscle points, optional calorie entries, and an optional user-chosen calorie target on the device. The app sends no user data to the developer. Device backups may include app data according to the user's Apple device settings.