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Responsive Tool vs MCPJam

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 MCPJam
DetailResponsive Tool logo Responsive ToolMCPJam logo MCPJam
What it doesFree responsive website checker for mobile, tablet and desktop Test, debug, and evaluate MCP servers across every major AI client
StageNot given Not given
FoundedNot given Not given
Based inNot given US
Pricing modelFree Freemium
PricingNot given Free: $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
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
Not given
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
  • 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
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 check63 +1 (up) since last check
Trust Flow (Majestic)120
Citation Flow (Majestic)2542
Referring domains (Majestic)14399

3 details filled in for both companies.

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