Excalidraw is an open-source whiteboard with a deliberately hand-drawn, low-fidelity style that keeps diagrams feeling like sketches. It is great for quick architecture diagrams, wireframes, and brainstorming, works offline, and offers end-to-end encrypted live collaboration.

Highlights

Charming hand-drawn aesthetic that suits sketches
Free, open source, and self-hostable
Works offline; data stays local by default
End-to-end encrypted live collaboration

Watch-outs

Intentionally low-fidelity, not for polished visuals
Lighter feature set than commercial canvases
Teams/cloud features need paid Excalidraw+

Good for

Whiteboarding Diagramming

Excalidraw is the fast, friendly choice for sketchy diagrams and brainstorms, especially for developers mapping out architecture. Its hand-drawn look is the point — if you need crisp, high-fidelity diagrams or a full design tool, look to tldraw for a richer canvas or Figma/Penpot for real UI design. For quick, private, free sketching it is excellent.

When to use it

developers_sketching_architecture
quick_brainstorms
open_source_advocates

Avoid if

need_high_fidelity_polished_diagrams
want_a_full_design_tool

Free

Free tierOpen source

Free and open source (MIT). Excalidraw+ is a paid hosted tier adding teams, cloud storage, and more.

Self-hostable
Native
Open source
Native
Real-time collaboration
Integration
Offline support
Native

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Excalidraw

Highlights

Watch-outs

Good for

When to use it