# Open-source diagrams and whiteboards

4 open-source diagrams and whiteboards rated against public privacy criteria.

1. [draw.io](https://privacyratings.com/diagrams/draw-io/): B (80/100). An open-source diagramming app for flowcharts, UML, network and architecture diagrams that runs in the browser or as a desktop app, and saves files to the device or to a storage service the user chooses.
2. [Mermaid](https://privacyratings.com/diagrams/mermaid/): B (80/100). An open-source JavaScript library that renders flowcharts, sequence, class, Gantt and other diagrams from Markdown-like text definitions. It is built into many documentation tools and code hosting sites.
3. [Excalidraw](https://privacyratings.com/diagrams/excalidraw/): C (65/100). An open-source virtual whiteboard for sketching hand-drawn style diagrams in the browser. Drawings are stored locally, and shared links and live collaboration are end-to-end encrypted. A paid hosted workspace, Excalidraw+, is also offered.
4. [PlantUML](https://privacyratings.com/diagrams/plantuml/): F (30/100). An open-source Java tool that generates UML and other diagrams, such as sequence, class, activity, Gantt and mind maps, from plain-text descriptions. It runs locally or through a public or self-hosted rendering server.

Source: https://privacyratings.com/open-source/diagrams/