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RepDB
RepDB is a one-time-purchase exercise dataset for developers building fitness and workout apps โ not a subscription, not a rate-limited API. You download the data once and own it: JSON (and SQLite on the higher tier), WebP images, and full EN/DE/ES translations, with no per-request billing and no dependency on our servers staying up.
A free tier includes 250 exercises with flat-style 512ร512 images, attribution-licensed for commercial in-app use. The Starter tier ($199) adds the full catalog in classic white-background style. Standard ($399) adds transparent 1024px images, looping animations, exercise relations (similar/progressions/regressions), workout templates, and embeddings โ exclusive to that tier.
Every exercise includes muscle-group highlighting, equipment/muscle icons, MET values, and safety/goal tags. Compared to GIF- or JPG-based competitor APIs, RepDB images are transparent WebP with no watermarks, so they drop into any app UI without a white box around them.
Readlang RepDBRepDB's answer:
RepDB is sold as a one-time download, not a metered API โ you own the JSON/SQLite data and WebP images outright, with no rate limits, no per-request billing, and no risk of the vendor cutting off access. It's also the only dataset in this space with EN/DE/ES translations, transparent (alpha-channel) images with no watermark, muscle-group highlighting, safety/goal tags, and looping animations on the higher tier.
RepDB's answer:
RepDB grew out of a consumer workout app its creator was building solo. Sourcing exercise images and data meant either paying for a subscription API with usage caps and no caching rights, or producing everything from scratch. The illustrated, multi-language dataset was built for us first, then split out as its own product once it became clear other indie developers had the same problem and preferred to buy the data outright rather than rent it through an API.
RepDB's answer:
Most alternatives are subscription APIs โ you pay monthly, you're capped on requests, and ExerciseDB's terms of use explicitly forbid caching or storing the data at all, so every image render is a live paid API call. RepDB is the opposite: pay once, download the files, self-host with zero ongoing dependency. It's also the only option offering true DE/ES localization and transparent images instead of a white box behind every exercise.
RepDB's answer:
Solo developers and small teams building fitness or workout-tracking apps (iOS, Android, web) who need licensed exercise images and structured exercise data, but don't want to build their own media pipeline or depend on a rate-limited third-party API.
Based on our record, Readlang seems to be more popular. It has been mentiond 53 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
AFAIK, I think the most popular version of this idea is https://readlang.com. - Source: Hacker News / over 2 years ago
In my own case, I struggled for over a decade, to get anywhere at all useful with Spanish, until someone in this forum recommended readlang.com. I can't speak for anyone else, but for myself: just reading entire stories, as fast as I could, without stopping AT ALL when I ran into an unknown word, or tense, or idiom, made THE critical difference. Before that, every second word was causing me to stop. And... Source: about 3 years ago
If you're going to do this, why not just use something like the free tier of ReadLang? Source: about 3 years ago
Readlang, but you have to have a basic vocabulary; otherwise it is not easy. Https://readlang.com/ I've had a love and hate relationship with Duolingo for Dutch and French. I'm trying it for Greek now and it seems to have improved over the last few years. Source: about 3 years ago
I think https://readlang.com/ is similar to LingQ and hast the option to upload files - I have never used it though, so no guarantee the formatting is better. Source: over 3 years ago
Duolingo - Duolingo is a free language learning app for iOS, Windows and Android devices. The app makes learning a new language fun by breaking learning into small lessons where you can earn points and move up through the levels. Read more about Duolingo.
Memrise - Learn a new language with games, humorous chatbots and over 30,000 native speaker videos.
Busuu - Join the global language learning community, take language courses to practice reading, writing, listening and speaking and learn a new language. Learn English with busuu's .
LingQ - Learn languages by immersing yourself in a world of interesting, authentic content!
Lingvist - Lingvist helps you take your foreign language skills to the next level with a broad selection of exercises and lessons.
Babbel - Babbel is a paid language learning service that aims to strike a balance between thoroughness and cost efficiency.