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jarpeek vs Craft Quantities

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

jarpeek compared with Craft Quantities
Detailjarpeek logo jarpeekCraft Quantities logo Craft Quantities
What it doesOnline JAR viewer and Java decompiler that runs entirely in your browser with no file uploads Free JSON API for construction calculators with test vectors and building codes
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Open source
PricingNot given Free under CC BY 4.0 licence
Key features
  • Inspect decompiled Java source code locally
  • View JVM bytecode instructions, operands, and labels
  • Explore class structure, fields, methods, and constant pool
  • Section-aware hex view of class file bytes
  • Support for JAR, WAR, and standalone CLASS files
  • Search and filter files and classes by name
  • Load remote JAR files from URLs with CORS support
  • Preview and export text and image resources
  • Web Workers for responsive decompilation
  • Safety limits for archive processing: 512 MiB input, 100,000 entries, 2 GiB expanded content
  • 1,173 construction calculators with full inputs and test vectors
  • 3,485 published test vectors for validation
  • No authentication key or rate limits required
  • Citations to building standards with section numbers
  • Executable API for running calculations on request
  • MCP server integration for AI assistants
  • 79 job takeoffs with calculator sequences
  • Cross-market glossary in US, Canadian, UK and Australian usage
  • Corrections ledger tracking confirmed errors
  • Unit conversion with exact statutory factors
What makes it different
  • 100% in-browser processing with no file uploads to servers
  • Privacy-first design where files are processed locally only
  • No installation, account, or Java runtime required
  • Multiple inspection views: source, bytecode, hex, and constant pool
  • Direct JAR URL loading from CORS-enabled servers
  • No API key required with no rate limits or quotas
  • CC BY 4.0 licence allows commercial use and redistribution
  • Every calculation cited to specific building code sections
  • Pinned test cases prevent silent changes to published figures
  • Complete accessibility with CORS support for browser use
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
Trust Flow (Majestic)00
Citation Flow (Majestic)2626
Referring domains (Majestic)1829

4 details filled in for both companies.

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