Compare software

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