compare
calibre vs KOReader
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | calibre | KOReader |
|---|---|---|
| Language | Python | Lua |
| Licence | GPL-3.0 | AGPL-3.0 |
| Stars | 26k | 30k |
| Latest | v9.15.0 | v2026.07.1 |
| Last push | 2026-10-06 | 2026-10-06 |
| Release cadence | about 21 days between releases | about 131 days between releases |
| Active contributors | 21+ commit authors on the default branch in the last 90 days | 57 commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Both replace Amazon Kindle. Alternatives to Amazon Kindle →
PartialcalibreThe library for your own DRM-free books, sent to a Kindle by email or USB, not the store.
PartialKOReaderReader for your own DRM-free books that runs on Kindle, Kobo, PocketBook and Android devices; not the Kindle store.
calibre
KOReader
- ota2026-09-29OTApre-release
- v2026.07.12026-08-01KOReader 2026.07.1
- v2026.072026-07-26KOReader 2026.07 "Sailing Walrus"
- v2026.032026-03-17KOReader 2026.03 "Snowflake"
- v2025.102025-11-01KOReader 2025.10 "Ghost"
calibre
✓ signed The latest release, v9.15.0, carries a signature GitHub verified.
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KOReader
unsigned The latest release, v2026.07.1, carries no signature GitHub could verify.
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