head to head · open source
devdocs vs oh-my-mermaid
devdocs has 39,462 GitHub stars, 2,643 forks, 196 open issues and last shipped 3 days ago. oh-my-mermaid has 2,264 stars, 196 forks, 11 open issues and last shipped 5 months ago. devdocs leads on adoption by 1,643% (39,462 vs 2,264 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 9%. 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 | ★ 39K | ★ 2.3K |
| License | MPL-2.0 | MIT |
| Written in | Ruby | TypeScript |
| Last push | 2026-09-15 | 2026-04-07 |
| Forks | ⑂ 2.6K | ⑂ 196 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick devdocs if
- You weight community size — 39K 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 is an API documentation browser that combines multiple developer documentations into a single, clean and organized web UI with instant search, offline support, a mobile version, a dark theme and keyboard shortcuts, and it is aimed at developers who need to read and search API and reference documentation quickly.
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 doc…
read the full oh-my-mermaid overview →
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Frequently asked questions
Is devdocs or oh-my-mermaid more popular?
devdocs has 39,462 GitHub stars and oh-my-mermaid has 2,264. 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 (39,462 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.