Skip to main content

Built by makers, shipped in public

Sign in

Viaduct vs Agent Role Contracts

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Viaduct compared with Agent Role Contracts
DetailViaduct logo ViaductAgent Role Contracts logo Agent Role Contracts
What it doesFree C4 modeling tool with an MCP server for software teams to share architecture context with AI development tools Offline checker for AI agent role declarations without executing agents
StageNot given Not given
FoundedNot given Not given
Based inLT JP
Pricing modelFreemium Open source
PricingBrowser: Free with account. Desktop: €10 a month after 7-day free trial, one licence covers 3 machines. Enterprise: custom pricing. Not given
Key features
  • System context, container, component, and code diagrams
  • Live collaboration on models
  • MCP server for AI coding agents
  • Change sets for scoped agent work
  • Organization SSO
  • JSON import and export
  • OpenAPI contract export
  • Desktop app for macOS, Windows, Linux
  • AI assistant for model descriptions
  • Installable PWA
  • Checks role and authority consistency
  • Validates reviewer-implementer separation
  • Verifies role references exist
  • Checks filesystem write scope boundaries
  • Runs completely offline without network access
  • Three command modes: validate, explain, and handoff
  • Clear exit codes for pass/fail/error states
  • MIT open source license
  • Bundled starter fixtures and examples
What makes it different
  • Model elements exist once and appear on every level they belong to
  • Endpoints are real OpenAPI documents, not diagram labels
  • Desktop app keeps all data local and offline-capable
  • Free browser version with no paywall or feature limits
  • AI agents read and write architecture through MCP
  • Designed through public feedback dialogue with incorporated role and path mapping improvements
  • Bundles working examples that run without API keys or accounts
Community votes00
DR (Domain Rating by Ahrefs)3 +1 (up) since last check13 no change since last check
Trust Flow (Majestic)109
Citation Flow (Majestic)2829
Referring domains (Majestic)7451

5 details filled in for both companies.

More alternatives to Viaduct More alternatives to Agent Role Contracts

Ask us