SellerSum VS Diffee

• 13 fee and profit calculators
  Calculators for eBay, Etsy, PayPal, Stripe, Square, Whatnot, Depop, Poshmark and Mercari, plus margin, markup and food cost. A comparison hub puts every marketplace's cut side by side.
• Rates quoted from official fee pages
  Every rate comes from the marketplace's own published fee page, and each calculator shows the date it was last checked. The source link sits on the page, so you can confirm the number yourself instead of taking our word for it.
• Tested against the marketplaces' own examples
  Where a marketplace publishes a worked example, the calculator reproduces it to the cent. eBay's $400 phone example is one of them, and a unit test fails the build if it ever stops matching.
• Fee changelog and email alerts
  Every fee change is logged with the date it landed. Sign up and you get one email when any tracked marketplace moves its rates, whichever calculator you use.
• Free, no signup
  Every calculator is free and works without an account. Nothing is behind a paywall.

Possible disadvantages

• Amazon-Only Limitation
  Since the tool is built specifically for Amazon sellers, it may not support other e-commerce platforms like Shopify, eBay, or Walmart, limiting its usefulness for multi-channel sellers.
• Subscription Cost
  Like many SaaS tools in this space, SellerSum likely operates on a subscription model, which adds an ongoing expense that may not be justified for very small sellers or those just starting out.
• Learning Curve for Advanced Features
  While the basic interface may be user-friendly, understanding and utilizing more advanced analytics or customization features may require some time investment to learn.
• Dependency on Amazon API Reliability
  Because the tool relies on syncing with Amazon Seller Central, any changes to Amazon's API, policies, or data availability could impact the accuracy or functionality of SellerSum's reporting.
• Limited Customization
  Depending on the platform's design, sellers with very specific or complex accounting needs may find the reporting templates and metrics less flexible compared to building custom solutions in Excel or specialized accounting software.

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