head to head · open source
Understand-Anything vs oh-my-mermaid
Understand-Anything has 89,864 GitHub stars, 7,643 forks, 303 open issues and last shipped 8 days ago. oh-my-mermaid has 3,371 stars, 268 forks, 11 open issues and last shipped 7 months ago. Understand-Anything leads on adoption by 2,566% (89,864 vs 3,371 stars). Understand-Anything is written in TypeScript under MIT; oh-my-mermaid is written in TypeScript under MIT. Understand-Anything has attracted 9% as many forks as stars, oh-my-mermaid 8%. Understand-Anything was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (claude-code), 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
| Understand-Anything | oh-my-mermaid | |
|---|---|---|
| GitHub stars | ★ 90K | ★ 3.4K |
| License | MIT | MIT |
| Written in | TypeScript | TypeScript |
| Last push | 2026-10-26 | 2026-04-07 |
| Forks | ⑂ 7.6K | ⑂ 268 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Understand-Anything if
- You weight community size — 90K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- 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 Understand-Anything
Understand Anything Turn any codebase, knowledge base, or docs into an interactive knowledge graph you can explore, search, and ask questions about. Works with Claude Code, Codex, Cursor, Copilot, Gemini CLI, and more. Understand Anything. Understand Anyone. AI should help people, not replace them. English 简体中文 繁體中文 日本語 한국어 Español Türkçe Русский An open source project from Egonex Originally created by Lum1104 . You just joined a new team. The codebase is 200,000 lines of code. Where do you even start? Understand Anything is a Claude Code Plugin that analyzes your project with a multi agent pipeline, builds a…
read the full Understand-Anything 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 Understand-Anything or oh-my-mermaid more popular?
Understand-Anything has 89,864 GitHub stars and oh-my-mermaid has 3,371. Understand-Anything has the larger community by that measure.
Are Understand-Anything and oh-my-mermaid free?
Both are open source. Understand-Anything is licensed under MIT and oh-my-mermaid under MIT. Neither carries a licence fee.
What is the difference between Understand-Anything and oh-my-mermaid?
Understand-Anything is written in TypeScript 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, Understand-Anything or oh-my-mermaid?
Choose Understand-Anything if you want the larger community (89,864 stars) or its MIT licence terms. Choose oh-my-mermaid if its feature set, stack or MIT licence fits better. Both are self-hostable.