C4 model
IcePanel
PlantUML
Excalidraw
Mermaid
Productivity Power Tools
SequenceDiagram.org
Graphviz
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.
C4 model 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, C4 model seems to be more popular. It has been mentiond 37 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.
C4[1]? Hadnโt heard of it until now. Thanks! Really curious what the major differences are that have you preferring it over other methods / winging it. [1]: https://c4model.com/. - Source: Hacker News / 10 days ago
C4 model is a pragmatic approach to architecture modelling. There are many ways to introduce this into your architecture agent, for instance by using Structurizr syntax plus tooling as they also have official MCP servers. For now we're just going to rely on a simple skill from my GitHub repo and existing DrawIO MCP and skills. Configuration is super-simple, you just have to drop in the skill into... - Source: dev.to / 4 months ago
I've been working on this desktop tool (FSL license, free for commercial use) for the past month because I now spend more time in a terminal prompting Claude Code instead of using a code editor. It generally works quite well if I ask the right questions, but I still often find a lot of dead code, stubs, or poor architectural choices when I finish a session, and understanding the codebase itself can be jarring... - Source: Hacker News / 5 months ago
When you need formal, lasting documentation, you need structure. The C4 model is brilliant for software, and we can adapt it perfectly for Kubernetes. It provides four levels of zoom, and you create a different diagram for each level. This prevents information overload. - Source: dev.to / 6 months ago
Deepwiki-rs approaches grounding through explicit, architecture-first artifacts rather than conversational explanations. Its outputs, such as C4 diagrams, component boundaries, and cross-references, are derived directly from static analysis of the source code, which makes their grounding relatively strong and inspectable. This tool implements a 4-step pipeline to generate documentation that includes C4 models of... - Source: dev.to / 8 months ago
IcePanel - Collaborative modelling and diagramming tool based on the C4 model. Software architecture design made fun! ๐ง
PlantUML - PlantUML is an open-source tool that uses simple textual descriptions to draw UML diagrams.
Excalidraw - Excalidraw is a whiteboard tool that lets you easily sketch diagrams that have a hand-drawn feel to them.
Mermaid - Create diagrams and visualizations using text and code.
Productivity Power Tools - Extension for Visual Studio - A set of extensions to Visual Studio 2012 Professional (and above) which improves developer productivity.
SequenceDiagram.org - Clean and fast online sequence diagram tool using scripting and Drag and Drop
