Outline vs PdfDing
Comparing two open source alternatives to Adobe Acrobat . Use the comparison below to decide which one fits your needs.
Outline
The fastest growing-team knowledge base — beautiful, realtime collaborative, feature packed, and markdown compatible Notion and Confluence alternative.
PdfDing
AGPL-3.0Self-hosted PDF manager, viewer, and editor with multi-device sync, tagging, and an in-browser reader; deployable via Docker.
Side-by-side comparison
| Outline | PdfDing | |
|---|---|---|
| License | — | AGPL-3.0 |
| Self-hostable | Yes | Yes |
| GitHub Stars | 40,147 | 1,849 |
| Forks | 3,480 | 119 |
| Open Issues | 80 | 11 |
| Last Commit | Aug 14, 2026 | Aug 15, 2026 |
| First Released | May 22, 2016 | Nov 27, 2024 |
| Categories | ||
| Tags | — |
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