draw.io
Draw diagrams and flowcharts for free.
/Visio
New to this? What open source means and how to read this page.
What it is
A diagramming editor that runs in the browser or as a desktop app and stores files where you choose.
Good for
Flowcharts, architecture diagrams, org charts and wireframes.
The catch
It is a diagram editor, not a collaboration suite. Live co-editing and shared libraries are weaker than in paid tools.
Facts checked on 12 October 2026. We have not yet run a hands-on test of this tool. When we do, it gets a "Tested" mark here. Approximate US list prices for an individual plan, from third-party price trackers checked on 12 Oct 2026. Monthly billing where it exists. Regions, taxes and promotions change them. Confirm at the vendor before you decide.
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