# Sioyek (open-source PDF tool)

> Sioyek is a free, open-source PDF tool for Windows, macOS and Linux. Sioyek is a PDF viewer with a focus on textbooks and research papers. It has 9,924 GitHub stars and is released under the GPL-3.0 license, and people use it instead of Adobe Acrobat Reader.

Sioyek is a PDF viewer with a focus on textbooks and research papers. A: If you are building the development branch you need to use Qt 6.7 or 6.8.

## Key facts

| Fact | Value |
|---|---|
| Repository | https://github.com/ahrm/sioyek |
| Platforms | Linux, macOS, Windows |
| Interface | desktop GUI |
| GitHub stars | 9,924 |
| License | GPL-3.0 (open source) |
| Replaces | Adobe Acrobat Reader |
| Language | C |
| Website | https://sioyek.info/ |
| Official | no |
| Category | PDF editors & tools |
| Latest release | v2.0.0 (Dec 16, 2022) |
| Last commit | Oct 7, 2026 |

## Install

### Flathub (Linux)

```sh
flatpak install flathub com.github.ahrm.sioyek
```

Package page: https://flathub.org/apps/com.github.ahrm.sioyek

### Homebrew (macOS)

```sh
brew install --cask sioyek.
```

Package page: https://formulae.brew.sh/cask/sioyek.

### AUR (Arch Linux)

Package page: https://aur.archlinux.org/packages/sioyek

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