C4 Model Diagram Generator
Describe your system and get a C4 context or container diagram: the people, the software systems and the containers, with every relationship labelled.
No sign-up required • Free to try
Example
C4 Model Diagram example, generated from one sentence
Prompt: “C4 context diagram: customers and support agents use a ticketing system that talks to an email provider and a CRM”
The four C4 levels, and the two worth generating
The C4 model describes a system at four zoom levels. The context diagram shows the system as one box with the people and the other systems around it. The container diagram opens that box into the things that run and store data: web apps, APIs, databases, queues. The component diagram opens one container, and the code level opens one component.
Almost every team only ever keeps the first two up to date, because the lower levels change with every refactor and are better read from the code. Those two are what this generator draws. Name the level in the prompt, say who uses the system, and list the containers with the technology of each ("API, Node.js"; "orders database, Postgres"); every relationship comes out as a labelled arrow.
For the container view of a real codebase, connecting the repository gives a diagram drawn from the code itself, and it is redrawn when the code changes.
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Frequently Asked Questions
Common questions about c4 model diagram generator
What is a C4 model diagram?▼
A C4 diagram is one view of a software system at a fixed zoom level: context (the system and its users and neighbours), container (the applications and data stores inside it), component (the parts of one container) or code. The model, created by Simon Brown, keeps each diagram to one level so a reader knows what the boxes mean.
Which C4 diagrams should a team maintain?▼
The system context and container diagrams. They change when the architecture changes, not with every commit, so they stay accurate for months. Component and code views are usually better generated from the code when someone needs them.
Can I edit the generated C4 diagram?▼
Yes. The result is a normal canvas: rename boxes, add a container, change a relationship label, then export to PNG or embed the live diagram in a README or Confluence page.
Ready to create your diagram?
Signing up costs nothing and every feature is included. Only AI generation is metered, in credits.