RepDB
ExerciseDB Alternative? Four Exercise-Image Datasets Compared (2026)
ExerciseDB alternative? An honest comparison of ExerciseDB.io, WorkoutX, free-exercise-db, and RepDB — image quality first, then catalogue depth, schema, and pricing.
Building a fitness tracker, I hit the same wall everyone does: where do I get the exercise data? Nothing quite fit, so I built RepDB. This is the short, honest comparison I wish I’d had. Only datasets that ship images — the visual layer is the hard part, and it’s where these products actually differ.
One thing to know up front: ExerciseDB and WorkoutX ship the same artwork. WorkoutX serves ExerciseDB’s animation assets through a metered API — same exercise IDs, same GIF frames (I downloaded both 0551 GIFs and compared them frame by frame; details in the methodology). So the real illustrated choice is ExerciseDB’s images — bought as a bundle, or rented through WorkoutX — versus RepDB’s.
The comparison
| ExerciseDB.io | WorkoutX | free-exercise-db | RepDB | |
|---|---|---|---|---|
| Images | GIF, opaque white bg | Same GIFs, hosted | JPG gym photos, mixed sizes | 2 illustrated styles, one on a transparent background |
| Colour | 8-bit (256 colours, visible banding) | 8-bit | 24-bit | 24-bit |
| Animation | 2-keyframe crossfade; more frames on complex moves | same | none | 2-keyframe loops + video-grade motion on complex moves (Standard) |
| File size, one exercise | 1.77 MB (1080px GIF) | hosted | ~200 KB | ~1 MB typical (960px animated WebP)† |
| Catalogue | 1,394 entries* | “1,400+”* (same catalogue) | ~800 | 470+ distinct movements |
| Languages | EN | EN | EN | EN · DE · ES |
| Pricing | $299–599 one-time | $0–24.99/mo metered | free | $199–399 one-time |
| License | commercial, explicit | API terms, image caching restricted | Unlicense (image provenance unclear) | commercial, written |
* Raw entry counts. ExerciseDB’s list includes camera-angle duplicates (barbell full squat (back pov) / (side pov)), (male)/(female) pairs, literal v. 2 entries, and grip/stance permutations of the same movement. Collapse those and the distinct-movement count lands far closer to RepDB’s 470+ than the headline suggests.
† Measured across the shipped Standard bundle: simple 2-keyframe crossfades average ~0.85–1.2 MB at 960px — lighter than their 1080px GIF. Complex movements with real captured motion (like the Turkish get-up above) run heavier — up to ~8 MB — because they’re an actual motion clip, not a 2-pose fade. Both are transparent; theirs isn’t.
The images decide it
Same exercise, side by side, both animated — WorkoutX serving ExerciseDB’s asset, and RepDB’s:
Three differences, measured from the actual files:
- Transparency. Opaque near-white GIFs turn into white squares on any dark or themed UI. RepDB’s classic style is transparent WebP — it drops onto any background, masks into round avatars, and re-tints to your brand with one CSS filter:
- Colour depth. GIF caps at 256 colours, which bands on smooth anatomical shading. WebP is full colour.
- Weight. Their 1080px GIF runs 1.77 MB. RepDB’s equivalent 2-keyframe crossfade (960px) averages ~0.85–1.2 MB — lighter, at full 24-bit colour and with real transparency. The video-grade Standard clips for complex movements — like the Turkish get-up above — trade some of that weight advantage for actual captured motion instead of a two-pose fade.
On animation, both catalogues crossfade two keyframes for simple movements (on ExerciseDB’s bench-press GIF you can see the barbell ghost mid-transition). The gap is on complex movements: ExerciseDB’s Turkish get-up runs 54 frames at 360px; RepDB’s is a 241-frame, 960px video-grade loop — generated from actual motion, so the kettlebell traces a smooth, precise path instead of stepping between poses. And it’s transparent WebP, not opaque GIF. On the Starter tier you get the raw keyframes instead, to crossfade yourself with ten lines of CSS.
Which one, when
ExerciseDB.io — you want the biggest raw catalogue, English is enough, and your UI is light/neutral so opaque white GIFs are fine. $299–599 once, clean commercial license.
WorkoutX — you want those same ExerciseDB images but hosted, for a prototype or hackathon. Free tier is genuinely free. Watch out at scale: every screen-view burns quota, the bill never ends, and you’re renting files rather than owning them.
free-exercise-db — free hobby or portfolio project, and real gym photography fits your brand. ~800 exercises, Unlicense on the code; the photos’ chain of title is fuzzier, so paid products should look closer.
RepDB — paid product where the UI matters: dark mode, brand theming, round avatars, EN/DE/ES, programming metadata (goals, safety tags, relations). 470+ distinct movements, transparent WebP in two styles, looping animations on Standard. $199 Starter undercuts ExerciseDB’s floor; $399 Standard undercuts their top tier. The free tier is 400 exercises with flat 512×512 images — the resolution ExerciseDB charges $299 for — licensed for commercial in-app use with attribution, no signup.
Methodology & disclosure
All numbers measured July 2026 from public sources: ExerciseDB.io’s sample bundle (exerciseList.json, 0025.json, GIFs at 180/360/720/1080 px), the free-exercise-db GitHub repo, and WorkoutX’s public pages. The WorkoutX/ExerciseDB comparison: both services’ GIF for exercise 0551 (kettlebell Turkish get-up “(squat style)”) downloaded and compared frame by frame — same 54-frame animation, WorkoutX’s upscaled to 360px with a watermark. RepDB figures match the shipping bundle (479 exercises, 2026-07). Vendors change things — verify against their sites.
Disclosure: I build and sell RepDB. Read accordingly, and check every claim above against the sources.