Compare software

Flowchart Fun vs D2: catalog facts
Flowchart Fun	D2
Free Described on its website as a free online flowchart maker.	Free Free and open source under the Mozilla Public License 2.0.
Web	Windows, Command line
Diagrams are written as plain text, so edits are fast Runs in the browser with nothing to install	Diagrams as text that fit into version control Simple syntax with automatic layout
Less control over exact layout than a freehand drawing tool License and source details are not stated on the homepage	Requires learning the D2 syntax Less fine control than drawing by hand
Web application	Downloadable app
Closed source	Open source
License not stated	License: MPL-2.0
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.