Generate C4 Model Diagrams with AI

The C4 model structures software architecture documentation into four levels — Context, Container, Component, and Code — each targeting a different audience at a different level of abstraction. Describe your system in plain English and get all four C4 levels generated with AI in seconds.

The four C4 levels

Level 1: System Context
The big picture. Shows your software system as a single box and how it relates to users and external systems (payment providers, identity providers, third-party APIs). Designed for non-technical stakeholders and executives.
Level 2: Containers
Zooms into your system and shows the containers (web apps, APIs, databases, message queues, mobile apps) and how they communicate. Designed for architects and technical leads.
Level 3: Components
Zooms into a single container and shows the major internal components (controllers, services, repositories, domain objects) and how they interact. Designed for developers working in that container.
Level 4: Code
UML class or sequence diagrams at the code level. Useful for complex or non-obvious implementations, but generally auto-generated from code rather than manually maintained.

The challenge

Most teams either skip C4 diagrams entirely (the documentation is outdated from day one) or spend too long maintaining them in tools like Structurizr DSL that require learning a custom modeling language. Getting a complete set of C4 diagrams for a new system from scratch typically takes hours of manual diagram work — and they're out of date by the next sprint.

The solution

Describe your system the way you'd explain it to a colleague:

"SaaS platform used by HR managers and employees. The system has a React SPA, a Node.js REST API, a PostgreSQL database, a Redis cache, and a background job processor (BullMQ). It integrates with Okta for SSO, Stripe for billing, and SendGrid for transactional email. Generate a C4 Container diagram."

From that description you get a complete C4 Container diagram with all containers labeled with technology choices and their communication protocols, plus the external systems shown at the boundary. Request Level 1 (Context) or Level 3 (Component) with a follow-up message.

Perfect for

Architecture documentation for new systems and major features
Stakeholder presentations that need multiple abstraction levels
Architecture review boards (ARBs) and design approvals
Developer onboarding to a new codebase or service
RFP and tender responses requiring architecture documentation
Replacing outdated architecture docs inherited from a previous team

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