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Viaduct vs Pydantic Logfire

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 Pydantic Logfire
DetailViaduct logo ViaductPydantic Logfire logo Pydantic Logfire
What it doesFree C4 modeling tool with an MCP server for software teams to share architecture context with AI development tools Production-grade AI and general observability built on OpenTelemetry
StageNot given Established
FoundedNot given 2018
Based inLT Not given
Pricing modelFreemium Freemium
PricingBrowser: Free with account. Desktop: €10 a month after 7-day free trial, one licence covers 3 machines. Enterprise: custom pricing. Personal: Free with 10 million records/month hard-capped at $0. Team: $49/month with 10 million records included, $2 per million additional. Growth: $249/month with everything in Team plus unlimited seats and up to 90-day retention. Enterprise: Custom pricing for Cloud, Dedicated, or Self-hosted opt
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
  • Real-time cost tracking and model usage analytics
  • SQL query interface for traces and logs
  • Integrated evals framework for AI output evaluation
  • AI Gateway for centralized LLM API management
  • Feature flags and managed variables without redeploy
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
  • Works with any language via standard OpenTelemetry, not proprietary SDKs
  • Traces full application stack, not just LLM layer
  • Integrated evaluation framework with production datasets and live evals
  • Querying production telemetry with standard PostgreSQL SQL
  • Built by the team behind Pydantic with 60K+ GitHub stars
Community votes00
DR (Domain Rating by Ahrefs)3 +1 (up) since last check83 no change since last check
Trust Flow (Majestic)1030
Citation Flow (Majestic)2854
Referring domains (Majestic)747880

5 details filled in for both companies.

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