A side-by-side comparison built from catalogue data. They share no listed features.
| App |  Okular KDE's universal document viewer with PDF annotation. |  Stirling-PDF Self-hosted web app for merging, splitting, converting and editing PDFs. |
|---|---|---|
| Developer | KDE | Stirling Tools |
| Pricing | Free | Free, Freemium |
| License | GNU GPL v2 or later | MIT License |
| Open source | Open source: Yes | Open source: Yes |
| Self-hostable | Self-hostable: No | Self-hostable: Yes |
| Works offline | Works offline: Yes | Works offline: No |
| Privacy-focused | Privacy-focused: No | Privacy-focused: Yes |
| Windows | Windows: Yes | Windows: No |
| Linux | Linux: Yes | Linux: No |
| Web | Web: No | Web: Yes |
| Self-hosted | Self-hosted: No | Self-hosted: Yes |
| Docker | Docker: No | Docker: Yes |
| Community rating | No reviews yet | No reviews yet |
| Likes | 0 | 0 |
| First released | — | — |
| Categories | PDF Tools | PDF Tools |
| Features | ||
| Form filling | Form filling: Yes | Form filling: not recorded |
| Merge and split PDFs | Merge and split PDFs: not recorded | Merge and split PDFs: Yes |
| Offline mode | Offline mode: Yes | Offline mode: not recorded |
| PDF annotation | PDF annotation: Yes | PDF annotation: not recorded |
| PDF editing | PDF editing: not recorded | PDF editing: Yes |
| Links | ||
Feature rows list only features recorded in the catalogue. A missing check means the feature is not recorded for that app, not necessarily that it is unavailable.
