AI C4 Diagram generator
Describe your c4 diagram in plain English and get editable Mermaid code instantly. Document software architecture using the C4 model (context, containers…).
Example prompts for a c4 diagram
- “Container diagram for a food delivery platform”
- “System context for a hospital records system”
- “Microservices e-commerce architecture”
What a Mermaid c4 diagram looks like
Example c4 diagram
C4Context
title System context – Online banking
Person(customer, "Customer", "A bank customer")
System(bank, "Internet Banking", "Lets customers view accounts and make payments")
System_Ext(mail, "Email system", "Sends notifications")
System_Ext(core, "Core banking", "Stores accounts and transactions")
Rel(customer, bank, "Uses")
Rel(bank, core, "Reads/writes", "HTTPS")
Rel(bank, mail, "Sends emails", "SMTP")
Rel(mail, customer, "Emails")Want to write it by hand? See the full Mermaid c4 diagram syntax and examples, or browse templates.
Frequently asked questions
How do I generate a c4 diagram with AI?
Describe the c4 diagram you need in the box above and click Generate. The AI writes valid Mermaid c4 diagram code that renders instantly, and you can open it in the editor to refine it.
Is the AI c4 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 c4 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.