Instantly generated C4 Model diagrams
One Architecture Model.
Infinite diagrams.
Always in sync.
Stop manually drawing and updating architecture diagrams. Model your architecture once in C4InterFlow — and generate any C4 diagrams dynamically, so they’re always accurate no matter how fast your systems evolve.
The hidden cost of static diagrams
Every team starts with good intentions. Then the system grows, and diagrams become a liability instead of an asset.
Tools like PlantUML and Mermaid help by moving diagrams into code — but even diagram code goes stale and has to be maintained manually. They solve the tooling problem, not the maintenance problem.
Diagrams go stale instantly
Every code change risks making your diagrams inaccurate. Keeping them up to date demands constant manual effort — effort most teams can’t afford.
Scale makes it worse
One architectural change can mean updating dozens of separate diagrams. The larger your system, the heavier the maintenance burden — and the higher the risk of inconsistency.
No one trusts them
When diagrams might be wrong, engineers stop consulting them. Architecture documentation becomes shelfware — and teams reverse-engineer the codebase instead.
A better way
Model your architecture. Generate diagrams on demand.
Instead of drawing diagrams that need constant maintenance, you define your architecture once as a model. C4InterFlow generates every diagram dynamically — always from source of truth.
Model your architecture
Define your software systems, containers, components, and the interfaces between them using C4 Model notation — the industry standard for architecture documentation.
Generate any diagram, instantly
Choose your view: Scope, Level of Detail, Diagram Type — C4InterFlow generates it dynamically from your model — no manual drawing required.
Update once, reflect everywhere
When your architecture changes, update the model in one place. Every generated diagram reflects the change immediately. Always accurate. Always trustworthy.
Many diagram types. One model.
Generate any views from the same architecture definition.
Context diagram
Show how your system fits into the world around it.
Container diagram
Zoom in to the high-level technical building blocks.
Container (Static) diagram
View architecture dependencies without behavioural flows.
Flow/Sequence diagram
Trace a specific interface or business process end to end.
What makes C4InterFlow different
C4InterFlow = C4 Model + Interfaces + Flows
Every C4 tool can draw diagrams. C4InterFlow extends the C4 Model with two concepts no other tool has — Interfaces and Flows — making your architecture model as precise and traceable as your code.
IT’S A GAME-CHANGER...!
Interfaces — explicit architecture contracts
- C4 Model gives you structure — Interfaces give you capability
- Every element declares what it exposes: APIs, UI, events, service methods
- Modelled just like interfaces in code — DI, IoC, DDD all rely on them
- Makes every dependency traceable to a specific, named Interface
- Interfaces become a first-class citizen of your architecture model
Flows — end-to-end traceability
- Flows connect Interfaces across your entire architecture stack
- Mirror how code executes: function calls → API endpoints → downstream services
- Define a Flow once — C4InterFlow traces all downstream dependencies automatically
- Add any Interface to scope — get a complete end-to-end flow diagram instantly
- Any use case. Any scenario. No manual drawing required.
Take it even further with Actors, Activities, and Business Processes
- Define Actors and their Activities — model who does what in your system
- Express each Activity’s logic using Interfaces and Flows
- Compose Business Processes from Actor Activities and System, Container, or Component Interfaces
- Add any Activity or Business Process to scope — visualise the full picture instantly
- View individual Use Cases and Scenarios with numbered, step-by-step flows
- Switch between Levels of Detail — from executive overview to component deep-dive
- Trace dependencies and analyse the impact of change before it happens
- The possibilities are endless
- Define Actors and their Activities — model who does what in your system
- View individual Use Cases and Scenarios with numbered, step-by-step flows
- Express each Activity’s logic using Interfaces and Flows
- Switch between Levels of Detail — from executive overview to component deep-dive
- Compose Business Processes from Actor Activities and System, Container, or Component Interfaces
- Trace dependencies and analyse the impact of change before it happens
- Add any Activity or Business Process to scope — visualise the full picture instantly
- The possibilities are endless
Any interaction. Any scenario. Any depth — traced end-to-end through your architecture automatically, from a single model.
Features
Everything you need to document architecture
Built for individual architects and engineering teams who want architecture documentation they can actually rely on.
Dynamic diagram generation
Diagrams are generated on demand from your model — not drawn by hand. Add a component once; it appears in every relevant diagram automatically.
C4 Model notation
Built on Simon Brown’s C4 Model — the industry standard for communicating software architecture at the right level of detail for any audience.
Team workspaces
Collaborate in a shared workspace with role-based access control. Admins, contributors, and read-only members — everyone sees what they need.
YAML export — no lock-in
Export your full architecture model as YAML at any time and use it with the open-source C4InterFlow CLI. Your data is always yours.
Multiple views, one model
Context, Container, Component, and Flow diagrams — all generated from a single architecture definition. Consistent, coherent, and always in sync.
Cloud-based
No installation, no setup. Access your architecture from any browser, on any device. Your model is always available when you need it.
Built for visual modelling. Compatible with Architecture as Code.
C4InterFlow is a visual modelling tool built on top of the open-source C4InterFlow framework — an Architecture as Code tool with its own YAML DSL. Import and export your full architecture model as YAML at any time, fully compatible with the C4InterFlow CLI — bridging visual modelling and Architecture as Code workflows seamlessly.
View on GitHubPricing
Start free. Scale as you grow.
The Free plan gives you one repository and 100 interfaces — enough to model a real system. Upgrade to Pro or Team when you’re ready for more repositories, collaboration, and unlimited capacity.
Ready to stop maintaining diagrams?
Model your architecture once. Let C4InterFlow handle the rest.
Start for free →No credit card required. Free plan available forever.