What does calibre replace?

calibre is a free alternative to Kindle Unlimited.

Is calibre open source?

Yes. calibre is licensed under GPL-3.0, an OSI-approved open-source license.

Does calibre run on Linux?

Yes (Arch extra: calibre; Flathub: com.calibre_ebook.calibre). Install with: sudo pacman -S calibre or flatpak install flathub com.calibre_ebook.calibre.

Can you self-host calibre?

There's nothing to host: calibre is a desktop app that runs on your own machine.

calibre

A free, open-source alternative to Kindle Unlimited.

Checked Oct 17, 2026 · How we check

calibre

Desktop app

Open source · GPL-3.0 Linux Arch/AUR

kovidgoyal/calibre26.1k★last push Oct 10, 2026checked Oct 17, 2026

Install

$ sudo pacman -S calibre

$ flatpak install flathub com.calibre_ebook.calibre

calibre: questions

What does calibre replace?: calibre is a free alternative to Kindle Unlimited.
Is calibre open source?: Yes. calibre is licensed under GPL-3.0, an OSI-approved open-source license.
Does calibre run on Linux?: Yes (Arch extra: calibre; Flathub: com.calibre_ebook.calibre). Install with: sudo pacman -S calibre or flatpak install flathub com.calibre_ebook.calibre.
Can you self-host calibre?: There's nothing to host: calibre is a desktop app that runs on your own machine.

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calibre: questions

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calibre