Best free diagram tools

1. Sketch diagrams and whiteboards that look hand-drawn
   ★ 135kstars
   excalidraw by excalidraw · Free alternative to Miro, FigJam
   Hand-drawn style whiteboard
   No codingWebsite▶ Try onlineHealthy
2. Draw diagrams by chatting with AI
   ★ 36.7kstars
   next-ai-draw-io by DayuanJiang
   Describe a diagram and AI draws it
   No codingWebsiteHealthy
3. Design database diagrams in your browser
   ★ 40.2kstars
   drawdb by drawdb-io
   Database diagrams in the browser
   No codingWebsiteHealthy
4. See any GitHub project as an interactive diagram
   ★ 18.7kstars
   gitdiagram by ahmedkhaleel2004
   See any GitHub project as a diagram
   No codingWebsiteHealthy
5. Draw neural network diagrams for papers
   ★ 5.7kstars
   NN-SVG by alexlenail
   Neural network figures for papers
   No codingWebsiteFair

Ranked for people new to AI: ease of use first, then quality, upkeep and popularity. Last checked 4 Nov 2026.

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