Mariposas is a free iOS fitness app built around one idea: real workouts should feel like playing a cozy collecting game. Every time you log a strength session, a GPS run, or a studio class, you earn a Gashapon capsule spin and pull a cute watercolor pet. You collect them, dress them in unlockable outfits, and build a little menagerie that grows with your training.

Under the game layer it is a real tracker. Strength workouts log sets and reps. Runs track distance, splits, and pace over GPS. Classes estimate calories from MET values. Daily streaks and weekly quests give you near-term goals, and a friends feed adds gentle accountability without turning fitness into a leaderboard grind.

Most "gamified" fitness apps reward steps or habit check-ins. Most virtual-pet apps (Finch, Wokamon, CalPets) grow a pet from walking or self-care. Mariposas is the one that ties the collecting loop to logged lifting, running, and classes, so the dopamine of a rare pull lands right after a real set. The vibe is cozy and low-pressure: soft pastel art, no shouting, no shame.

It is free on iOS with an optional premium tier. If you have ever wanted a Tamagotchi for your gym habit, or you like Finch but wish the pet grew from your actual workouts, Mariposas is for you.