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Excalidraw

Virtual whiteboard with a hand-drawn look.

AppOpen source
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Browser diagram and sketch editor with a hand-drawn look, real-time collaboration and image export.

When to use

To sketch architectures and ideas quickly, alone or collaboratively.

When to avoid

For formal, standardized diagrams in versioned documentation; prefer text (Mermaid).

Alternatives

They do a similar job. Compare before choosing.

  • Mermaid

    Diagrams from text, right in Markdown.

    LibraryOpen source★ 90.9K