head to head · open source
calibre-web vs papermill
calibre-web has 18,530 GitHub stars, 1,902 forks, 409 open issues and last shipped 26 days ago. papermill has 6,498 stars, 465 forks, 196 open issues and last shipped 1 months ago. calibre-web leads on adoption by 185% (18,530 vs 6,498 stars). calibre-web is written in Fluent under GPL-3.0; papermill is written in Python under BSD-3-Clause. calibre-web has attracted 10% as many forks as stars, papermill 7%. calibre-web 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
| calibre-web | papermill | |
|---|---|---|
| GitHub stars | ★ 19K | ★ 6.5K |
| License | GPL-3.0 | BSD-3-Clause |
| Written in | Fluent | Python |
| Last push | 2026-10-10 | 2026-10-05 |
| Forks | ⑂ 1.9K | ⑂ 465 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick calibre-web if
- You weight community size — 19K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches Fluent
- You value the larger contributor base for long-term maintenance
pick papermill if
- You want the papermill feature set and don't need the biggest community
- You prefer the BSD-3-Clause license terms
- Your stack matches Python
- You evaluated both and papermill fits your workflow better
About calibre-web
Calibre Web Calibre Web is a web app that offers a clean and intuitive interface for browsing, reading, and downloading eBooks using a valid Calibre database. Table of Contents (click to expand) 1. About 2. Features 3. Installation Installation via pip (recommended) Quick start Requirements 4. Docker Images 5. Troubleshooting 6. Contributor Recognition 7. Contact 8. Contributing to Calibre Web This software is a fork of library and licensed under the GPL v3 License. Features Modern and responsive Bootstrap 3 HTML5 interface Full graphical setup Comprehensive user management with fine grained per user permissions…
read the full calibre-web overview →
About papermill
papermill is a tool for parameterizing, executing, and analyzing Jupyter Notebooks. Papermill lets you: parameterize notebooks execute notebooks This opens up new opportunities for how notebooks can be used. For example: Perhaps you have a financial report that you wish to run with different values on the first or last day of a month or at the beginning or end of the year, using parameters makes this task easier. Do you want to run a notebook and depending on its results, choose a particular notebook to run next? You can now programmatically execute a workflow without having to copy and paste from notebook to…
read the full papermill overview →
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Frequently asked questions
Is calibre-web or papermill more popular?
calibre-web has 18,530 GitHub stars and papermill has 6,498. calibre-web has the larger community by that measure.
Are calibre-web and papermill free?
Both are open source. calibre-web is licensed under GPL-3.0 and papermill under BSD-3-Clause. Neither carries a licence fee.
What is the difference between calibre-web and papermill?
calibre-web is written in Fluent and papermill 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, calibre-web or papermill?
Choose calibre-web if you want the larger community (18,530 stars) or its GPL-3.0 licence terms. Choose papermill if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.