Mozilla PDF.js vs Skim
| Mozilla PDF.js | Skim | |
|---|---|---|
| Free plan | Yes | No |
| Free trial | No | No |
| Paid from | Free | — |
| Open source | No | No |
| Platforms | api, extension, Linux, self-hosted, Web | macOS |
| Annotation tools | Yes | Yes |
| Form filling | Yes | — |
| Platform support | cross-platform | desktop |
| Free plan | — | Yes |
| OCR support | — | none |
Both are listed in Best PDF Readers. On Freedom251, Mozilla PDF.js scores higher on our published basis.