Coggle
coggle.it
Mind maps that stay readable as branches multiply
Free tier
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markmap.js.org
Turns a Markdown outline into a collapsible mind map as you type.
Paste a nested Markdown list and the heading hierarchy becomes an interactive mind map you can collapse, expand and export as SVG or an interactive HTML file. Because the source is just Markdown, the map is a by-product of notes you were writing anyway rather than a separate document to maintain. It runs entirely in the browser. It only reads structure from headings and list nesting — there is no dragging nodes around, no colours, no styling.
AltFTool does this too
If you would rather not leave the site, Markdown Preview covers the same job here — free, no account, and it runs in your browser.
Open Markdown PreviewQuestions
Works the moment the page loads. No account, no email, no trial. The layout is generated from your Markdown nesting and cannot be rearranged by hand.
No. Markmap does the work inside your browser, so the file never leaves your device — you can load the page, disconnect from the network, and it still works. That makes it a reasonable choice for material containing personal data.
The layout is generated from your Markdown nesting and cannot be rearranged by hand.
Alternatives
Same category or same task, ordered by how closely they overlap.
coggle.it
Mind maps that stay readable as branches multiply
excalidraw.com
Hand-drawn-looking whiteboard that opens instantly with no sign-up
mermaid.live
Write a diagram as text and watch it render beside you
tldraw.com
Infinite canvas that feels like a native app in a browser tab
asciiflow.com
Draws boxes and arrows as plain ASCII you can paste into a comment
diagrams.net
Full diagram editor that works without an account or a saved file