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Jern Cloud vs Viaduct

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

Jern Cloud compared with Viaduct
DetailJern Cloud logo Jern CloudViaduct logo Viaduct
What it doesCloud coding agent for GitHub that runs your tests before and after, and opens pull requests with receipts Free C4 modeling tool with an MCP server for software teams to share architecture context with AI development tools
StageNot given Not given
FoundedNot given Not given
Based inNot given LT
Pricing modelFreemium Freemium
PricingFree trial: 30 days with $5 of inference included, no card required. Paid: $19 per workspace per month (billed after trial ends). Browser: Free with account. Desktop: €10 a month after 7-day free trial, one licence covers 3 machines. Enterprise: custom pricing.
Key features
  • Runs tests before and after changes
  • Detailed receipts showing what changed and cost
  • Scheduled campaigns with budget caps and safety limits
  • No setup required, no API keys to start
  • Supports Python, Node, .NET, and Java
  • Network proxy blocks private addresses
  • Policy enforcement with configurable access
  • 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
What makes it different
  • Transparent receipts with provider request IDs instead of vendor black boxes
  • Open source runtime that runs the same agent locally
  • Use your own provider key with metered usage
  • Never merges—you control all pull request acceptance
  • 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
Community votes00
DR (Domain Rating by Ahrefs)6 +1 (up) since last check20 no change since last check
Trust Flow (Majestic)810
Citation Flow (Majestic)1428
Referring domains (Majestic)1674

5 details filled in for both companies.

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