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MCPJam vs eryx

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

MCPJam compared with eryx
DetailMCPJam logo MCPJameryx logo eryx
What it doesTest, debug, and evaluate MCP servers across every major AI client WebAssembly sandbox for running untrusted Python safely
StageNot given Not given
FoundedNot given Not given
Based inUS Not given
Pricing modelFreemium Open source
PricingFree: $0/mo with 200 credits/day and 500 free eval iterations. Pro: $24/mo (billed annually at $288/year) with 5,000 credits/mo. Team: $199/mo (billed annually at $2,388/year) with 50,000 credits/mo. Enterprise: Custom pricing. Additional credits: $10 per 1,000 credits (Pro), $9 per 1,000 credits (T Not given
Key featuresNot given
  • Full CPython 3.14 with standard library
  • Async callbacks from sandboxed code
  • No filesystem or network unless allowed
  • Fast startup in 1–5 milliseconds
  • Embed from Python, JavaScript or Rust
  • MCP server support
  • gRPC server deployment
  • Hosted execution over HTTP and WebSocket
What makes it different
  • Tests how external AI clients use your MCP server, not just how your code runs
  • Open source core runs locally or in your own CI, never sees live traffic
  • Evaluations score tool choice and goal completion across repeated runs, not brittle assertions
  • Automatically maintains current behavior of 16+ AI clients so your tests stay relevant
  • Framework and deployment agnostic: works with any MCP server however it was built
  • Full CPython 3.14 running in WebAssembly
  • Async callbacks between sandbox and host
  • Extremely fast sandbox startup
  • Works as MCP server for AI agents
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)63 +1 (up) since last checkNot checked yet no change since last check
Trust Flow (Majestic)200
Citation Flow (Majestic)426
Referring domains (Majestic)3992

3 details filled in for both companies.

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