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String Utility Belt vs MCPJam

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

String Utility Belt compared with MCPJam
DetailString Utility Belt logo String Utility BeltMCPJam logo MCPJam
What it doesFree online string and text tools for encoding, decoding, hashing, formatting and converting text in your browser 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
  • Base64 encoding and decoding
  • URL encoding and decoding
  • JSON formatting, validation and minifying
  • JWT decoding with readable timestamps
  • SHA-256 and other cryptographic hashing
  • UUID generation with multiple versions
  • Text diffing with multiple formats
  • Chainable pipelines with live preview
  • CSV to JSON and JSON to YAML conversion
  • Regular expression explanation in plain English
Not given
What makes it different
  • All processing happens in your browser with no data uploaded to servers
  • Chain multiple tools into pipelines with live preview of each step
  • Available across VS Code, CLI, MCP and as a Node.js library
  • No cookies or tracking scripts, privacy-focused
  • 248 utilities organized by category with guides and worked examples
  • 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)38 +1 (up) since last check63 +1 (up) since last check
Trust Flow (Majestic)520
Citation Flow (Majestic)2442
Referring domains (Majestic)18399

3 details filled in for both companies.

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