A document viewer for e-ink readers that opens PDF, DjVu, EPUB, FB2, CBZ and many other formats on Kindle, Kobo, PocketBook and more.
30.9K+157 this week2KLuaAGPL-3.0Updated 4 hours ago
1 alternative
Best open-source alternatives to Calibre viewer (2026)
Looking for a free, open-source alternative to Calibre viewer? These 1 projects can replace it. Each one passed our quality screening and is explained in plain words, so you can compare stars, license and maintenance at a glance.
Quick comparison
| Project | Stars | License | Last commit |
|---|---|---|---|
| koreader/koreader | ★ 30.9K | AGPL-3.0 | 4 hours ago |
FAQ
- Is there a free, open-source alternative to Calibre viewer?
- Yes. The most popular open-source alternatives to Calibre viewer on Repolode are koreader.
- Which Calibre viewer alternative should I choose?
- koreader has the most GitHub stars and is released under AGPL-3.0. Compare the license and last commit of each option in the table above before choosing.
How this list is made: AI reads each project's documentation to match it with products it can replace, every project passes our quality screening, and the list is ranked by GitHub stars. Stars updated Nov 6, 2026. How Repolode works