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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 400 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.
Protobuf 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, Protobuf seems to be more popular. It has been mentiond 84 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.
gRPC is strictly contract first11 which is a design approach that works especially well in larger development teams. It also excels when developing microservices, as a contract would be created before any actual implementations can be done. The contract is designed in the .proto file12, which is also where gRPC gains some of its speed from, seeing as .proto files are... - Source: dev.to / almost 3 years ago
Protocol Buffers, developed by Google, is a compact and efficient binary serialization format designed for high-performance data exchange. - Source: dev.to / over 1 year ago
Protocol Buffers: https://developers.google.com/protocol-buffers. - Source: dev.to / over 3 years ago
ProtocolBuffersโ OneOf message addresses the case of having a message with many fields where at most one field will be set at the same time. - Source: dev.to / over 3 years ago
That's definitely the bigger thing. I think something like Protocol Buffers (Protobuf) is what you're looking for there. Output the data and consume it by something that can handle the analysis. Source: over 3 years ago
gRPC - Application and Data, Languages & Frameworks, Remote Procedure Call (RPC), and Service Discovery
Apache Thrift - An interface definition language and communication protocol for creating cross-language services.
Messagepack - An efficient binary serialization format.
GraphQL - GraphQL is a data query language and runtime to request and deliver data to mobile and web apps.
Avro - Avro Keyboard is an Unicode and ANSI compliant Free Bangla Typing Software and Bangla Spell Checker for Windows.
Protocol Buffers - A method for serializing and interchanging structured data.
