head to head · open source
koodo-reader vs PolyglotPDF
koodo-reader has 28,699 GitHub stars, 2,148 forks, 271 open issues and last shipped 2 days ago. PolyglotPDF has 1,324 stars, 198 forks, 14 open issues and last shipped 1.1 years ago. koodo-reader leads on adoption by 2,068% (28,699 vs 1,324 stars). koodo-reader is written in JavaScript under AGPL-3.0; PolyglotPDF is written in Python under GPL-3.0. koodo-reader has attracted 7% as many forks as stars, PolyglotPDF 15%. koodo-reader was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (ebook), 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 | PolyglotPDF | |
|---|---|---|
| GitHub stars | ★ 29K | ★ 1.3K |
| License | AGPL-3.0 | GPL-3.0 |
| Written in | JavaScript | Python |
| Last push | 2026-11-01 | 2025-09-28 |
| Forks | ⑂ 2.1K | ⑂ 198 |
| 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 PolyglotPDF if
- You want the PolyglotPDF feature set and don't need the biggest community
- You prefer the GPL-3.0 license terms
- Your stack matches Python
- You evaluated both and PolyglotPDF 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 PolyglotPDF
python包在2.2版本之前预计不会更新，2.2版本预估采取解析最底层span获取更信息的布局逻辑解决，预估解决：行内公式错误判断为公式块，错误将粗体文本进行分段bug,以及insert html方法重复嵌入字体文件导致处理页数较大pdf时浪费计算资源极其卡顿。 目前效果，对于基于文本的pdf,polyglotpdf的解析方式依旧是最优解。 ocr和布局分析并不总是完美。（考虑处理文本上下标问题，大部分pdf文件中上标下标文本通过指定坐标和字体大小实现伪上下标，考虑替换为真正的上下标文字对应的Unicode编码，但并不完美），对于报告型表格文档，polyglotpdf效果相当完美，当然表格中的复杂矢量数学公式依旧无法正确处理）。 寻求意见的改进方法，对于复杂的颜色布局文本或者粗体参杂常规字体文本，提出以下方法，对于流内容我们可以解析为html格式如下： ABSTRACT: The swine industry annually suffers significant economic losses caused by porcine reproductive and respiratory syndrome virus (PRRSV). Because the available commercial vaccines have limited protective efficacy against epidemic…
read the full PolyglotPDF overview →
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Frequently asked questions
Is koodo-reader or PolyglotPDF more popular?
koodo-reader has 28,699 GitHub stars and PolyglotPDF has 1,324. koodo-reader has the larger community by that measure.
Are koodo-reader and PolyglotPDF free?
Both are open source. koodo-reader is licensed under AGPL-3.0 and PolyglotPDF under GPL-3.0. Neither carries a licence fee.
What is the difference between koodo-reader and PolyglotPDF?
koodo-reader is written in JavaScript and PolyglotPDF 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, koodo-reader or PolyglotPDF?
Choose koodo-reader if you want the larger community (28,699 stars) or its AGPL-3.0 licence terms. Choose PolyglotPDF if its feature set, stack or GPL-3.0 licence fits better. Both are self-hostable.