Diagramming
draw.io
Open source diagramming tool with real-time collaboration and privacy-first data storage.
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6+ Free Diagramming Tools
7 of the 8 tools in this category have a free plan. Each offers a free tier beside paid plans.
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Diagramming tools with a free plan
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Diagramming
Mindomo
Mindomo is a collaborative mind mapping tool supporting mind maps, concept maps, outlines, and Gantt charts with real-time editing and AI
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Diagramming
PlantUML
An open-source tool that generates UML and other diagrams from simple textual descriptions.
Diagramming
Moqups
A web-based tool for creating and collaborating on wireframes, mockups, diagrams, and prototypes.
Diagramming
MockFlow
A wireframing and online whiteboard tool with AI-powered collaboration and UI design features.
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Frequently asked questions
How many Diagramming tools are there?
Siteefy's live index currently tracks 8 Diagramming tools, with 8 added in 2026. The count updates automatically as tools are published or retired.
Are there free Diagramming tools?
Yes. 7 offer a free plan alongside paid tiers.
How is this Diagramming list ordered?
Boosted listings appear first, then the most reviewed tools, then the most saved and highest rated. Star ratings come from community reviews, and anyone can review a tool or suggest one that is missing.