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Reference edition 2026.46

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Responsive Tool vs eryx

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

Responsive Tool compared with eryx
DetailResponsive Tool logo Responsive Tooleryx logo eryx
What it doesFree responsive website checker for mobile, tablet and desktop WebAssembly sandbox for running untrusted Python safely
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Open source
PricingNot given Not given
Key features
  • Test multiple device viewports simultaneously
  • Real CSS viewport rendering
  • Share setup links
  • Custom pixel width testing
  • No installation required
  • Sync scroll across panes
  • Browser-based with no account needed
  • 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
  • Compare multiple real device widths side by side instead of switching one at a time
  • Faster than DevTools for checking several device sizes at once
  • Entirely browser-based with no setup, signup or download
  • Built and maintained by one developer in the open
  • 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)Not checked yet no change since last checkNot checked yet no change since last check
Trust Flow (Majestic)10
Citation Flow (Majestic)256
Referring domains (Majestic)142

4 details filled in for both companies.

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