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LucidChart
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.
ArchGen
RepDBArchGen's answer
ArchGen focuses on turning plain-text system descriptions into clean, professional architecture diagrams that are meant to be edited and refined, not treated as final AI output.
Unlike many diagram tools that start from boxes and arrows, ArchGen starts from intent and structure, then helps users quickly iterate toward a diagram they actually agree with.
RepDB'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.
ArchGen's answer
ArchGen is a good fit when you care more about clarity and speed than perfect formal notation.
Compared to diagram-as-code tools like Mermaid or PlantUML, it reduces the upfront syntax and layout work. Compared to traditional visual editors, it avoids manual box-by-box drawing.
The goal is not to replace architectural thinking, but to get closer to a usable diagram faster.
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.
ArchGen's answer
ArchGen is built for software engineers, architects, and technical leads who regularly need to explain system design in documents, specs, or discussions.
It is especially useful for people who already know what they want to communicate, but donโt want to spend too much time manually drawing diagrams.
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.
ArchGen's answer
ArchGen started from a common frustration: most architecture diagrams are either time-consuming to draw or hard to keep aligned with how you actually think about a system.
The idea was to use AI as a starting point for structure and layout, while keeping humans fully in control of the final result through editing and refinement.
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.
ArchGen's answer
ArchGen is built as a modern web application, combining large language models for text understanding with a custom diagram rendering and editing layer.
The focus is on producing structured, editable outputs rather than static images.
ArchGen's answer
ArchGen is currently used by individual developers and small teams exploring faster ways to create and iterate on architecture diagrams.
The product is still early, and feedback from early users plays a big role in shaping its direction.
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Bluebeam Revu - The end-to-end digital workflow and collaboration solution trusted by over 1 million AEC professionals worldwide. Revu delivers award-winning PDF creation, editing, markup and collaboration technology designed for AEC workflows.
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PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
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