Design C4, System Design, and Sequence diagrams without signing up. Save locally or export your work. Accounts add AI Guided Draft, the full palette, and up to 20 cloud diagrams.
AAL describes architecture structure and relationships. It does not capture the complete visual canvas. Colors, styling, coordinates, and manual positioning may not reproduce identically. Use a project JSON export to preserve supported presentation details.
Local: Saved only in this browser on this device. Clearing site data can remove local projects. Export a file to keep a backup.
Cloud: Private to your account. Available on other devices when you sign in.
Cloud projects support up to 2 MB of project data and names up to 200 characters.
Cloud projects: Sign in to save to cloud
Your saved prototypes will appear here. Choose a diagram type, paste AAL, or import a project to begin.