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TestFlows Machine vs eryx

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

TestFlows Machine compared with eryx
DetailTestFlows Machine logo TestFlows Machineeryx logo eryx
What it doesRun your programs deterministically. Record, replay, and branch your runs. WebAssembly sandbox for running untrusted Python safely
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFreemium Open source
PricingFree: €0 with ₡3 credits included each month (about 20 vCPU-hours). Starter: €10/month with ₡25 credits (about 166 vCPU-hours). Plus: €25/month with ₡65 credits (about 433 vCPU-hours). Pro: €50/month with ₡150 credits (about 1,000 vCPU-hours). Dedicated: contact sales. Usage credits: €1 a credit, pu Not given
Key features
  • Record runs with non-deterministic inputs pinned down
  • Replay runs instruction-by-instruction
  • Checkpoint and fork from any point
  • Fault injection for disk, network, clock, containers and system calls
  • Built-in debugger for machine programs
  • Machine client and Python SDK
  • Cloud storage for runs and disk images
  • Multiple simultaneous sessions with configurable vCPUs
  • Configurable session disk up to 256G
  • 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
  • Deterministic replay of program runs with identical outcomes
  • Fork and branch from any point without losing original timeline
  • Comprehensive fault injection testing built-in
  • Pay-as-you-go usage credits with free plan available
  • 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)2 no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)40
Citation Flow (Majestic)216
Referring domains (Majestic)272

4 details filled in for both companies.

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