head to head · open source
koodo-reader vs grimmory
koodo-reader has 28,699 GitHub stars, 2,148 forks, 271 open issues and last shipped 2 days ago. grimmory has 4,642 stars, 357 forks, 243 open issues and last shipped yesterday. koodo-reader leads on adoption by 518% (28,699 vs 4,642 stars). koodo-reader is written in JavaScript under AGPL-3.0; grimmory is written in Java under AGPL-3.0. koodo-reader has attracted 7% as many forks as stars, grimmory 8%. grimmory was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 3 topic tags (cbr, cbz, epub), 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
| koodo-reader | grimmory | |
|---|---|---|
| GitHub stars | ★ 29K | ★ 4.6K |
| License | AGPL-3.0 | AGPL-3.0 |
| Written in | JavaScript | Java |
| Last push | 2026-11-01 | 2026-11-02 |
| Forks | ⑂ 2.1K | ⑂ 357 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick koodo-reader if
- You weight community size — 29K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick grimmory if
- You want the grimmory feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Java
- You evaluated both and grimmory fits your workflow better
About koodo-reader
简体中文 हिंदी Português Indonesian English Türkçe Koodo Reader A cross platform ebook reader Download Preview Roadmap Document Plugins Preview Features Format support: EPUB ( .epub ) PDF ( .pdf ) DRM free Mobipocket ( .mobi ) and Kindle ( .azw3 , .azw ) Plain text ( .txt ) FictionBook ( .fb2 ) Comic book archive ( .cbr , .cbz , .cbt , .cb7 ) Rich text ( .md , .docx ) HyperText ( .html , .xml , .xhtml , .mhtml , .htm ) Platform support: Windows , macOS , Linux , Android , iOS and Web Sync and backup your data with OneDrive , Google Drive , Dropbox , iCloud , MEGA , pCloud , Yandex Disk , Box , FTP , SFTP , WebDAV…
read the full koodo-reader overview →
About grimmory
Grimmory is a self hosted digital library for people who take their reading seriously. Documentation · Quick Start · Translations · Discord · Releases Features Supported Formats Quick Start [!TIP] For OIDC setup, advanced configuration, or upgrade guides, see the full documentation. Requirements: Docker and Docker Compose. Image Repositories Step 1: Environment Configuration Create a .env file: Step 2: Docker Compose Stable images are published from semantic release tags on main as vX.Y.Z plus latest . Nightly images are built from develop and tagged nightly . Create a docker compose.yml or copy and adapt…
read the full grimmory overview →
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Frequently asked questions
Is koodo-reader or grimmory more popular?
koodo-reader has 28,699 GitHub stars and grimmory has 4,642. koodo-reader has the larger community by that measure.
Are koodo-reader and grimmory free?
Both are open source. koodo-reader is licensed under AGPL-3.0 and grimmory under AGPL-3.0. Neither carries a licence fee.
What is the difference between koodo-reader and grimmory?
koodo-reader is written in JavaScript and grimmory in Java. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, koodo-reader or grimmory?
Choose koodo-reader if you want the larger community (28,699 stars) or its AGPL-3.0 licence terms. Choose grimmory if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.