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Cascadia

Diagrams you can diff, review, and share.

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Cascadia with the Signal maintenance sequence diagram open: Mermaid code on the left and the rendered diagram of the track crew, control desk and Signal 14 on the right.

The text is the source of truth.

Write the diagram. The picture follows.

In Cascadia, two lines of Mermaid are typed into the Ferry booking flowchart, and the preview redraws after each: a yes branch to Pay with transit card, then a no branch to Join the waitlist.In Cascadia, two lines of Mermaid are typed into the Ferry booking flowchart, and the preview redraws after each: a yes branch to Pay with transit card, then a no branch to Join the waitlist.
  1. Type a line of Mermaid
  2. The preview redraws with it
  3. Type the next; the diagram follows
In Cascadia, typing a new line in the Platform alerts flowchart offers Mermaid arrows to complete. The line is finished with a one-dash arrow, so it gets an error marker and a lightbulb; its quick fix changes the arrow to two dashes, the marker clears and the diagram renders the new Alert log node.In Cascadia, typing a new line in the Platform alerts flowchart offers Mermaid arrows to complete. The line is finished with a one-dash arrow, so it gets an error marker and a lightbulb; its quick fix changes the arrow to two dashes, the marker clears and the diagram renders the new Alert log node.
  1. Completion offers Mermaid arrows
  2. A mistyped arrow is marked, with a lightbulb
  3. Apply the quick fix: the marker clears

  • Plain Mermaid, live preview

    Flowcharts, sequence diagrams, class diagrams, state diagrams, and other Mermaid types, as plain Mermaid, with a live rendered preview beside your source.

  • An editor that knows Mermaid

    Syntax highlighting, completion for diagram types and keywords, an error marker on the line that stops a diagram from rendering, and quick fixes for common mistakes.

  • Source mapping

    Click a shape in the preview to jump to the line that drew it; move the cursor and the preview highlights what that line draws.

  • Markdown documents

    View markdown documents with diagrams embedded inline. Design notes and their diagrams stay together in one place.

  • Imports between diagrams

    Reference one diagram from another with a %% @import comment, so shared definitions live in one file instead of being copied around.

Manage diagrams the way you manage code.

Folders, history, and the people you choose.

In Cascadia, Version History opens for the Night bus routes diagram. Choosing version 1 compares it with the diagram now, first as code and then rendered: before, the route ends at N2 Old Town; after, it continues to N3 University.In Cascadia, Version History opens for the Night bus routes diagram. Choosing version 1 compares it with the diagram now, first as code and then rendered: before, the route ends at N2 Old Town; after, it continues to N3 University.
  1. Open Version History
  2. Choose an earlier version
  3. See the rendered diagram before and after

  • Folders and search

    Keep diagrams and documents in folders, find them by name, and see everything shared with you in one list.

  • Version history you can see

    Every diagram keeps its version history. Compare a version with the code change and the rendered diagram before and after, and restore any of them.

  • Sharing that matches intent

    Each diagram is private until you share it. Let anyone with the link view or edit it, or add people by e-mail as viewers or editors.

  • Saves that don't collide

    When someone else saved first, see both versions side by side, then keep yours, use theirs, or combine the two.

  • Edits kept on this device

    If a save can't reach the server, your latest edits stay in the browser, ready to restore the next time you open the diagram.

  • Export and copy

    Export a diagram as SVG, PNG, or a Visio drawing, copy it to the clipboard, or download the source of every diagram you own as a zip archive.

Start diagramming.

Open Cascadia

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