AI Sequence Diagram generator
Describe your sequence diagram in plain English and get editable Mermaid code instantly. Show how services, users and systems exchange messages over time.
Example prompts for a sequence diagram
- “OAuth 2.0 authorization code flow with PKCE”
- “Checkout with payment provider webhook confirmation”
- “Chat message delivery with read receipts”
What a Mermaid sequence diagram looks like
Example sequence diagram
sequenceDiagram
autonumber
actor U as User
participant W as Web App
participant A as Auth API
participant D as Database
U->>W: Submit login form
W->>A: POST /login
A->>D: Find user by email
D-->>A: User record
alt password valid
A-->>W: 200 + session token
W-->>U: Redirect to dashboard
else invalid
A-->>W: 401 Unauthorized
W-->>U: Show error
endWant to write it by hand? See the full Mermaid sequence diagram syntax and examples, or browse templates.
Frequently asked questions
How do I generate a sequence diagram with AI?
Describe the sequence diagram you need in the box above and click Generate. The AI writes valid Mermaid sequence diagram code that renders instantly, and you can open it in the editor to refine it.
Is the AI sequence diagram generator free?
You can try it free — 5 AI generations in total, no sign-up needed. Starter includes 500 AI conversations a month and Pro is unlimited. Manual editing and export stay free after that.
Can I edit the generated sequence diagram?
Absolutely. The output is plain Mermaid code — edit it by hand in the live editor, or ask the AI for changes in natural language.