diagrams.net
diagrams.net
Full diagram editor that works without an account or a saved file
No sign-upOn deviceClassic
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lucidchart.com
Polished diagramming with real-time collaboration and smart layout.
The corporate diagram tool: cleaner defaults than the free alternatives, live multi-cursor editing, comments, and data-linked shapes that pull values from a spreadsheet. Good when a diagram has to be presented rather than merely understood. The free plan is the wall — three editable documents, and 60 objects per document counting lines and text boxes, which a real architecture diagram exceeds quickly.
AltFTool does this too
If you would rather not leave the site, Flow Chart Maker covers the same job here — free, no account, and it runs in your browser.
Open Flow Chart MakerQuestions
A genuinely usable free tier with paid plans for volume or team features. Free accounts get three editable documents with a 60-object cap each, and lines count as objects.
Yes. Lucidchart sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Free accounts get three editable documents with a 60-object cap each, and lines count as objects.
Alternatives
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diagrams.net
Full diagram editor that works without an account or a saved file
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Write a diagram as text and watch it render beside you
plantuml.com
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