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Viaduct #3

C4 modeling tool for software teams with AI-powered architecture diagrams

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Viaduct is a free C4 modeling tool for software teams, with a hosted MCP server that feeds your architecture to AI development tools. System context, container, component and code diagrams, live collaboration, and change sets your coding agent can implement. Free in the browser with an account; the desktop app is a subscription.

Viaduct — Free C4 Modeling Tool with an MCP Server V I A D U C T by Quiet Grid Labs Viaduct Platform For agents Desktop Integrations About Docs Sign up Log in Sign up Clarity at every level. One architecture model. Connected knowledge. Shared context for your team and AI agents. Free in the browser with an account — every C4 level, the hosted MCP server and change sets included. The desktop app is the only paid part: 7 days free, then €10 a month. Create a free account See the model Context: System boundary. Containers: Services and APIs. Components: Business logic. Code: Implementation Watch

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