CloakShare
Cloak vs Papermark
Papermark is an open-source DocSend alternative (AGPL). Cloak takes a different approach with a stronger security model: server-side rendering to canvas prevents content extraction that's possible with Papermark's DOM-based viewer. Plus, Cloak supports video sharing.
| Feature | Cloak | Papermark |
|---|---|---|
| API-first | Yes | Limited |
| Open source | MIT | AGPL |
| Video sharing | HLS streaming | No |
| Office documents | DOCX, PPTX, XLSX | Limited |
| Canvas-based viewer | Yes | No (DOM-based) |
| Dynamic watermarks | Per-session | Basic |
| Webhooks | Yes | No |
| Custom domains | Yes | Yes |
| Embeddable viewer | Yes | No |
| Teams & RBAC | Yes | Yes |
| Email gate | Yes | Yes |
| Print protection | CSS + headers | No |
| Page-level analytics | Yes | Yes |
| Background rendering | Yes | Client-side |
| Screenshot protection | Permissions-Policy | No |
Video sharing
Papermark doesn't support video. Cloak transcodes uploads to adaptive HLS streaming with canvas watermark overlay, watch time analytics, and per-segment signed URLs. Share training videos, product demos, and investor presentations with the same security as documents.
Security model
Papermark renders documents in the DOM, making content accessible via browser DevTools. Cloak renders documents server-side to images, then draws them to a Canvas element. The original document content never exists in the DOM, making it significantly harder to extract.
MIT vs AGPL licensing
Cloak uses the MIT license, which allows unrestricted commercial use, modification, and integration. Papermark uses AGPL, which requires you to open-source your entire application if you modify or integrate Papermark's code.