head to head · open source
devdocs vs oh-my-mermaid
devdocs has 39,596 GitHub stars, 2,656 forks, 196 open issues and last shipped yesterday. oh-my-mermaid has 3,371 stars, 268 forks, 11 open issues and last shipped 7 months ago. devdocs leads on adoption by 1,075% (39,596 vs 3,371 stars). devdocs is written in Ruby under MPL-2.0; oh-my-mermaid is written in TypeScript under MIT. devdocs has attracted 7% as many forks as stars, oh-my-mermaid 8%. devdocs was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (developer-tools, documentation), so they are genuine substitutes rather than adjacent tools.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| devdocs | oh-my-mermaid | |
|---|---|---|
| GitHub stars | ★ 40K | ★ 3.4K |
| License | MPL-2.0 | MIT |
| Written in | Ruby | TypeScript |
| Last push | 2026-11-02 | 2026-04-07 |
| Forks | ⑂ 2.7K | ⑂ 268 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick devdocs if
- You weight community size — 40K stars and counting
- You want the MPL-2.0 license terms
- Your stack matches Ruby
- You value the larger contributor base for long-term maintenance
pick oh-my-mermaid if
- You want the oh-my-mermaid feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and oh-my-mermaid fits your workflow better
About devdocs
DevDocs — API Documentation Browser DevDocs combines multiple developer documentations in a clean and organized web UI with instant search, offline support, mobile version, dark theme, keyboard shortcuts, and more. DevDocs was created by Thibaut Courouble and is operated by freeCodeCamp. We are currently searching for maintainers Please reach out to the community on Discord if you would like to join the team! Keep track of development news: Join the contributors chat room on Discord Watch the repository on GitHub Table of Contents: Quick Start · Vision · App · Scraper · Commands · Contributing · Documentation ·…
read the full devdocs overview →
About oh-my-mermaid
English Türkçe 한국어 日本語 中文 Oh my mermaid AI writes code in seconds. Humans understand it in hours. But skip understanding, the codebase becomes a black box — even to you. omm closes the gap — architecture docs, generated by AI, for humans. Quick Start Paste this in your terminal: Then open your AI coding tool and use the /omm scan skill: That's it. View the result: Example omm scanned itself. This is what it found. How It Works Your AI analyzes the codebase and generates perspectives — different lenses on your architecture (structure, data flow, integrations...). Each perspective contains a Mermaid diagram and…
read the full oh-my-mermaid overview →
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Frequently asked questions
Is devdocs or oh-my-mermaid more popular?
devdocs has 39,596 GitHub stars and oh-my-mermaid has 3,371. devdocs has the larger community by that measure.
Are devdocs and oh-my-mermaid free?
Both are open source. devdocs is licensed under MPL-2.0 and oh-my-mermaid under MIT. Neither carries a licence fee.
What is the difference between devdocs and oh-my-mermaid?
devdocs is written in Ruby and oh-my-mermaid in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, devdocs or oh-my-mermaid?
Choose devdocs if you want the larger community (39,596 stars) or its MPL-2.0 licence terms. Choose oh-my-mermaid if its feature set, stack or MIT licence fits better. Both are self-hostable.