calibre by kovidgoyal
The official source code repository for the calibre ebook manager
About calibre
From the project's README at github.com/kovidgoyal/calibre. Lightly cleaned for readability; for the full source see the upstream repo.
calibre is an e-book manager. It can view, convert, edit and catalog e-books in all of the major e-book formats. It can also talk to e-book reader devices. It can go out to the internet and fetch metadata for your books. It can download newspapers and convert them into e-books for convenient reading. It is cross platform, running on Linux, Windows and macOS.
[](https://github.com/kovidgoyal/calibre/actions?query=workflow%3ACI) Screenshots
A tarball of the source code for the current calibre release. Bugs
Bug reports and feature requests should be made in the calibre bug tracker at Launchpad. GitHub is only used for code hosting and pull requests. Support calibre
Health score breakdown
6-dimension composite. See methodology for formula and weights.
Adoption signals
Real-world usage data, pulled from each registry. The bigger the numbers, the more battle-tested the project.
| Signal | Value | Source |
|---|---|---|
| GitHub stars | 25k | github.com/kovidgoyal/calibre |
| GitHub forks | 2.6k | github.com/kovidgoyal/calibre |
| PYPI downloads (last month) | 2.7k | calibre |
Release & maintenance
Is this project actively maintained, or about to die? Check the recency of last commit and last release.
| Project age | 13.0 years | since May 2013 |
| Last commit | 3 days ago | May 4, 2026 |
| Releases shipped | 347 | last: 6 days ago |
| Security policy | SECURITY.md | declared by maintainers |
| Funding links | 4 | declared by maintainers |
Self-hosting cost across providers
Detected requirements: 4GB RAM, 40GB disk minimum. Cheapest plan per provider that meets the requirement.
| Provider | Plan | Specs | Monthly | |
|---|---|---|---|---|
| hetzner | CAX11 | 2c · 4GB · 40GB | $4.13 USD | Deploy → |
| vultr | VC2 | 1c · 1GB · 25GB | $5 USD | Deploy → |
| linode | Nanode 1GB | 1c · 1GB · 25GB | $5.12 USD | Deploy → |
| digitalocean | Basic Regular 1GB | 1c · 1GB · 25GB | $6 USD | Deploy → |
Security advisories
CVE-2026-33206. What people say on Hacker News
Ready to self-host calibre?
Spin up a hetzner CAX11 (4GB RAM, 40GB disk) for $4.13/mo and follow the project's official install docs.
Data last refreshed May 7, 2026.
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