Side by side
SumatraPDF vs Thorium Reader
Both stand on file reader software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan Windows
SumatraPDF covers a wide range of reading formats and PDF tasks at no cost. Its Windows-only availability and the stated crash-report behavior are worth considering before choosing it.
Visit SumatraPDF Free plan iPhoneLinuxMac+1
Visit Thorium Reader The facts
| SumatraPDF | Thorium Reader | |
|---|---|---|
| Free plan | Yes | Yes |
| Open source | Not published | Not published |
| Runs on | Windows | iPhone, Linux, Mac, Windows |
| Lowest paid plan | Free or on request | Not published |
| Plans published | 1 | None |
| Maker | Not published | Not published |
| Website | sumatrapdfreader.org | thorium.edrlab.org |
| On file reader software | #17 of 24 | #21 of 24 |
SumatraPDF: what it does well
- Opens PDFs, ebooks, comics, and image formats.
- PDF tools include signing and form filling.
- Portable version can run from a USB drive.
- Supports screen readers and text-to-speech.
What to know first
- Available only for Windows.
- No OCR support.
- Official builds send crash reports that may contain document fragments.
Thorium Reader: what it does well
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