dia lets AI assistants such as Claude create system architecture diagrams, and lets people view, check, and share them. Diagrams are made of elements and arrows, and dia lays them out automatically, so you never adjust positions by hand and can focus on the content.
The web app is at https://dia.rakudeji.com. You sign in with a Google account.
What you can do
Ask your AI for diagrams
Describe the diagram you want, and your AI creates an architecture or data flow diagram.
See changes as they happen
When your AI edits a diagram, the change appears on the screen you have open.
Go back to earlier versions
Every change is kept as a version. Review what changed and restore an earlier version.
Share and download
Share a document by link. Download diagrams as PNG, SVG, or ZIP.
Icons
Browse the standard icons, or upload your own logos as custom icons.
Present
Show diagrams full screen and step through them with the keyboard.
How it works
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Connect your AI
Register the connection URL with your AI. See Connect your AI.
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Ask your AI
Tell your AI what diagram you want. It creates a document and diagrams in dia.
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View it in dia
Open the diagram in the web app and check it. Tell your AI what to fix. Share or download the result.
Key terms
| Term | Meaning |
|---|---|
| Project (プロジェクト) | A container for documents. Documents created without a project go into Unsorted (未分類). |
| Document (ドキュメント) | An ordered set of diagrams. Sharing works per document. |
| Diagram (図) | A single diagram made of elements and arrows. |
| View (ビュー) | A named highlight of some elements in a diagram. Your AI adds views to a diagram. |
| Version (バージョン) | A record kept each time a diagram changes. |
There are two kinds of documents: standard documents, where each diagram stands on its own, and steps documents, where each diagram builds on the one before it. See Projects and documents.