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Viaduct

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

AI Productivity Tools unknown Source-reviewed · Oct 14, 2026 New

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What is Viaduct?

Viaduct is C4 modeling tool for software teams with AI-powered architecture diagrams It's designed for software architects who model systems in c4 and want ai agents to work with the model.

About Viaduct

Key Strengths

C4-model architecture tool with a hosted MCP server so AI agents can read and propose changes to your diagrams
Changes go through change sets you review, plus OpenAPI import and JSON export
Free in the browser with an account, and hosted in the EU

Limitations to Consider

The desktop app costs €10/month after a 7-day trial, and its builds aren't code-signed
The AI assistant has a monthly allowance
Very new, with only a handful of Uneed ratings; don't confuse it with viaduct.ai, an unrelated manufacturing AI company

Best For

Software architects who model systems in C4 and want AI agents to work with the model.

Skip it if: You're happy with Structurizr or diagram-as-code in your repo.

Pricing

unknown

flexible pricing options

Browser app free with an account; desktop app (macOS, Windows, Linux, up to 3 machines) 7 days free, then €10/month. (checked Oct 23, 2026)

Sources

Pros, cons and pricing compiled from public sources (official pricing/docs pages, published reviews, user reports), not hands-on testing.

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Frequently Asked Questions

What is Viaduct?

Viaduct is C4 modeling tool for software teams with AI-powered architecture diagrams It's designed for software architects who model systems in c4 and want ai agents to work with the model.

How much does Viaduct cost?

Viaduct offers flexible pricing options You can check pricing on their official website.

Who should use Viaduct?

Viaduct is best suited to software architects who model systems in c4 and want ai agents to work with the model.