RepDB
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Notes from building RepDB and shipping fitness apps.
Animated WebP vs MP4 for Exercise Animations
One transparent master, two deliveries: when to ship the animated WebP and when to export an MP4 — measured on real exercise clips.
How to Recolour the Muscle Highlight to Your Brand Colour
Recolour the orange muscle highlight in RepDB exercise images, animations and heatmap layers to your brand colour, in your own code.
Best Exercise Animation Libraries for Fitness Apps (2026)
Choose an exercise animation library for your app: RepDB’s transparent motion, matching stills and multilingual data, compared with Vital, GymVisual and MoveKit.
Exercise Animations in Videos: WebP to MP4
Convert transparent exercise WebP to MP4, GIF, or an alpha video layer with practical export steps and common mistakes.
Fitness App Themes with Transparent Animations
Use transparent exercise animations for dark mode, brand colours, gradients, and consistent fitness app themes.
How to Use Exercise Images in a Fitness App
Build exercise libraries and detail screens with matching stills and transparent animations. Practical sizing and loading patterns, with measured examples.
Lazy-Loading Exercise Animations in Fitness Apps
A complete still-first pattern: click-to-play, one active clip, reduced motion — with the decode budget measured on a 12-card catalogue grid.
Exercise Dataset Licenses for Commercial Apps
Choose an exercise dataset for a commercial app: RepDB's licensed artwork, JSON and SQLite, free attribution tier, and product and media use terms.
ExerciseDB Alternatives 2026: 8 APIs and Datasets
ExerciseDB alternatives compared: RepDB, ExerciseDB.io and free-exercise-db files, plus hosted APIs from WorkoutX, AscendAPI, API Ninjas, MuscleWiki and wger.