head to head · open source
calibre vs yomiyasu
calibre has 26,074 GitHub stars, 2,708 forks, 6 open issues and last shipped yesterday. yomiyasu has 1,589 stars, 36 forks, 3 open issues and last shipped yesterday. calibre leads on adoption by 1,541% (26,074 vs 1,589 stars). calibre is written in Python under GPL-3.0; yomiyasu is written in Python under MIT. calibre has attracted 10% as many forks as stars, yomiyasu 2%. yomiyasu was the more recently maintained of the two, and both are self-hostable with no licence fee.
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
| calibre | yomiyasu | |
|---|---|---|
| GitHub stars | ★ 26K | ★ 1.6K |
| License | GPL-3.0 | MIT |
| Written in | Python | Python |
| Last push | 2026-10-06 | 2026-10-06 |
| Forks | ⑂ 2.7K | ⑂ 36 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick calibre if
- You weight community size — 26K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick yomiyasu if
- You want the yomiyasu feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Python
- You evaluated both and yomiyasu fits your workflow better
About calibre
calibre is the official source code repository for the calibre e book manager, an open source application written in Python and released under GPL 3.0. It lives in the content and publishing ecosystem as a desktop tool for books, and it is cross platform, running on Linux, Windows and macOS. The project has been hosted on GitHub for roughly thirteen years, carries about 25,900 stars and 2,683 forks, and its home on the web is calibre ebook.com, where an About page and a screenshots page document it further.
read the full calibre overview →
About yomiyasu
yomiyasu is an Agent Skill that rewrites AI generated Japanese into natural, readable prose, for writers, engineers and editors who draft technical articles, design documents, pull request descriptions and internal reports with LLMs.
read the full yomiyasu overview →
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Frequently asked questions
Is calibre or yomiyasu more popular?
calibre has 26,074 GitHub stars and yomiyasu has 1,589. calibre has the larger community by that measure.
Are calibre and yomiyasu free?
Both are open source. calibre is licensed under GPL-3.0 and yomiyasu under MIT. Neither carries a licence fee.
What is the difference between calibre and yomiyasu?
calibre is written in Python and yomiyasu in Python. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, calibre or yomiyasu?
Choose calibre if you want the larger community (26,074 stars) or its GPL-3.0 licence terms. Choose yomiyasu if its feature set, stack or MIT licence fits better. Both are self-hostable.