head to head · open source
koreader vs yomiyasu
koreader has 30,136 GitHub stars, 1,945 forks, 1,345 open issues and last shipped yesterday. yomiyasu has 1,589 stars, 36 forks, 3 open issues and last shipped yesterday. koreader leads on adoption by 1,797% (30,136 vs 1,589 stars). koreader is written in Lua under AGPL-3.0; yomiyasu is written in Python under MIT. koreader has attracted 6% as many forks as stars, yomiyasu 2%. koreader 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
| koreader | yomiyasu | |
|---|---|---|
| GitHub stars | ★ 30K | ★ 1.6K |
| License | AGPL-3.0 | MIT |
| Written in | Lua | Python |
| Last push | 2026-10-06 | 2026-10-06 |
| Forks | ⑂ 1.9K | ⑂ 36 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick koreader if
- You weight community size — 30K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches Lua
- 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 koreader
KOReader is a free, AGPL 3.0 licensed document viewer written in Lua that runs on e ink readers from Cervantes, Kindle, Kobo and PocketBook, on reMarkable, and on Android and desktop Linux, aimed at readers who want broader format support, finer typesetting control and better performance than the reading software shipped with their device.
read the full koreader 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 koreader or yomiyasu more popular?
koreader has 30,136 GitHub stars and yomiyasu has 1,589. koreader has the larger community by that measure.
Are koreader and yomiyasu free?
Both are open source. koreader is licensed under AGPL-3.0 and yomiyasu under MIT. Neither carries a licence fee.
What is the difference between koreader and yomiyasu?
koreader is written in Lua 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, koreader or yomiyasu?
Choose koreader if you want the larger community (30,136 stars) or its AGPL-3.0 licence terms. Choose yomiyasu if its feature set, stack or MIT licence fits better. Both are self-hostable.