Viaduct is a C4 modeling tool that helps software teams visualize and document system architecture. Create system context, container, component, and code diagrams with live collaboration features.
The browser-based version is free with an account. It integrates with an MCP server that feeds your architecture into AI development tools, enabling coding agents to understand and implement changes. Desktop app requires a subscription.
Ideal for teams wanting to align AI-assisted development with accurate architecture documentation.
