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RepDB
RepDB is a one-time-purchase exercise dataset with animations for developers building fitness and workout apps — 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 600+ exercises with flat-style 512×512 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 — 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.
Uno Platform RepDBRepDB's answer:
RepDB is sold as a one-time download, not a metered API — 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 — 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.
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> I like WASM and I want to like WASM but the rate of maturity within the ecosystem is incredibly abysmal. The C# toolchain for WebAssembly is pretty good. You can do a lot with Avalonia and Uno: https://avaloniaui.net/ https://platform.uno/ Here's a C# clone of Visual Basic compiled to WebAssembly: https://bandysc.github.io/AvaloniaVisualBasic6/. - Source: Hacker News / 4 months ago
Next, I explored Uno Platform. This framework impressed me immediately. - Source: dev.to / 9 months ago
We're excited to announce our newest challenge with Uno Platform! - Source: dev.to / 10 months ago
WASM and DOM in Rust: https://www.leptos.dev/ Uno can render to canvas or the DOM in C#: https://platform.uno/ Blazor renders to the DOM: https://dotnet.microsoft.com/en-us/apps/aspnet/web-apps/blazor. - Source: Hacker News / 10 months ago
> All that instead of making WPF crossplatform. Avalonia (https://avaloniaui.net/) and Uno (https://platform.uno/) are cross platform UI frameworks for .NET. Both work in the browser with WebAssembly. Avalonia renders to canvas. Uno can render to canvas or the DOM. Here are a couple of Avalonia demos: https://solitaire.xaml.live/ https://bandysc.github.io/AvaloniaVisualBasic6/. - Source: Hacker News / 11 months ago
Avalonia - A multi-platform .NET UI framework
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Maui Project (MauiKit) - A free and modular front-end framework for developing fast and powerful user experiences.