Viaduct
Free browser C4 modeling with a hosted MCP server and live team collaboration
Freemium - Web app: free forever with an account (no card). Desktop app: available via paid subscription; price not listed on landing page.
About Viaduct
Viaduct is a free, browser-based C4 architecture modeling tool for software teams. It supports all four C4 levels (system context, container, component, code), Magic flows and docs, live collaboration, team projects and change sets. A hosted MCP server is included to expose your architecture to AI development tools and coding agents. The web app is free forever with an account; a separate desktop app is available via subscription (desktop subscription does not affect web features). No trial or card required for the web version.
Key Features
- Support for all four C4 diagram levels (system, container, component, code)
- Hosted MCP server that feeds architecture to AI development tools and coding agents
- Live collaboration, team projects and implementable change sets
- Magic flows and documentation generation
- Free in-browser use forever; optional paid desktop app
Who is this for?
Software architects, engineering teams, and developers using AI-assisted tooling
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Pricing
FreemiumWeb app: free forever with an account (no card). Desktop app: available via paid subscription; price not listed on landing page.
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