
MuPDF
7.7#1 in pdf sdksFrom $299 a monthFree planAndroidiOSWebLinux
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| Fact | MuPDF | Skim |
|---|---|---|
| Annotation tools | Yes | Yes |
| Free plan | Yes | Yes |
| Platform support | cross-platform | desktop |
MuPDF is for developers who need document handling in desktop, cloud/server, or embedded software. It may suit teams evaluating an open-source option, provided they can meet AGPL terms or arrange commercial licensing.
Skim suits macOS readers who annotate scientific papers or other PDFs and need presentation, scripting, or LaTeX-related tools. It is intended for desktop use on supported macOS versions.