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CatalystAgile Marketplace Fee Calculator

Know your real take-home on Etsy, eBay, Poshmark, Depop and Mercari before you list.

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What you get

Enter price, cost and shipping and see every fee broken out — listing, transaction, payment processing, offsite ads, regulatory operating fees — plus net profit, margin, and the exact price needed to hit a target profit. Fee tables are dated and cited.

  • Five marketplaces with region variants
  • Every fee itemised, not a single blended rate
  • Break-even and target-profit solver
  • Dated, cited fee reference table
  • Works fully offline

What's in the ZIP

  • Full PWA source (HTML/CSS/JS)
  • README-USER-GUIDE.md
  • GROQ-OPTIONAL.md hook
  • LICENSE.md (single-buyer perpetual)
  • Logo + favicon assets
  • 1 free hosting walkthrough

Hosting your copy

Drop the unzipped folder into Cloudflare Pages, Vercel, Netlify, or even a S3 bucket. The PWA works as a static site — no Node server, no database, no API key required. Add a free Groq API key later if you want AI-enhance mode (instructions in GROQ-OPTIONAL.md).