Buyer's guide
Best exercise database APIs for fitness apps (2026)
If you're building a workout app, you need exercises, images, and structured metadata. Here's an honest comparison of the real options — free and paid — so you can pick the right one.
Last updated June 2026 · maintained by the team behind BarPath
Every fitness app hits the same wall early: where do the exercises come from? You can scrape, commission illustrations, stitch together a free dataset, or pay for an API. The trade-offs are real — volume vs. curation, free vs. clean licensing, photos vs. illustrations. We build a shipping iOS app (BarPath) and also sell our dataset (MuscleMap), so we'll be upfront about where we win and where we don't.
| Source | Exercises | Images | Dual-gender | Difficulty | License | Price |
|---|---|---|---|---|---|---|
| MuscleMap | 552 (curated) | Hand-drawn, per-exercise (the movement) | Yes — male + female | Audited + reasoning | Clean commercial | API free→$49/mo · $99–299 one-time |
| ExerciseDB | ~11,000+ | Scraped-style GIFs (1 each) | No | Basic field | AGPL-3.0 (open) / freemium API | Free tier → paid API |
| wger | ~500+ | Some, inconsistent (CC) | No | No | AGPL / CC images | Free (open-source, self-host) |
| free-exercise-db | ~873 | Model photos (no muscle overlay) | No | Level field | Public domain (Unlicense) | Free |
| WorkoutLabs | ~800 | Professional static illustrations | Add-on | Partial | Per-illustration / library | $$$ ($1,200+/yr library) |
| API Ninjas | Data only | None | — | Basic | Commercial API | Part of a bundle |
Figures as of June 2026 from each provider's public docs; verify the latest before relying on them. "Curated" means hand-picked gym-real movements rather than every grip/stance variation counted separately.
The free options (great floor)
free-exercise-db (yuhonas) is the easiest "just ship something" choice: ~873 exercises and ~1,700 model photos, public-domain, zero strings. The catch: the photos have no muscle overlay, some fields are incomplete, and it's a lightly-maintained GitHub repo. wger is a full open-source fitness platform with an API you can self-host; great if you want control, but the images are sparse and inconsistent and it's AGPL. Both are excellent if free + "good enough" beats polish.
ExerciseDB (the volume option)
ExerciseDB is the default paid API on RapidAPI — huge breadth (~11,000+ entries) with an animated GIF per exercise. If you want the most exercises and don't mind scraped-style GIFs, it's the obvious pick. Two honest caveats: that count includes a lot of near-duplicate variations, and the open data is AGPL-3.0 (a copyleft license that can be awkward for a closed-source app — check it carefully). It also offers a separate muscle-visualizer tool if you want muscle-group heatmaps.
Where MuscleMap fits
We didn't try to win on volume. MuscleMap is 552 curated movements with original, hand-drawn illustrations of each exercise being performed — in both a male and a female version, worked muscles highlighted — plus difficulty that's been audited (with a per-exercise reason on paid tiers) and a clean commercial license (no copyleft, no attribution, no scraped-image copyright fog). It's the exact dataset shipping in the BarPath iOS app, so it's been tested in production rather than dumped from a vendor with no product. New exercises are added throughout the year.
Pick MuscleMap if you want consistent, professional per-exercise illustrations (especially dual-gender) and a license you can actually ship a commercial app on — without commissioning 1,000+ drawings yourself. Pick a free option if breadth and $0 matter more than polish, and you're fine with photos or sparse images.