SellerSum is a suite of 13 free fee and profit calculators for online sellers — eBay, PayPal, Etsy, Stripe, Square, Whatnot, Depop, Poshmark, Mercari — plus a marketplace fee comparison hub and a food-cost calculator. Every rate is sourced from official marketplace fee pages with dates, a changelog tracks every fee change, and free email alerts notify you when fees change. No signup, no paywall.
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Maker
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Hey Product Hunt! I built SellerSum after running my own cross-border e-commerce print business and getting tired of guessing what marketplaces would actually take in fees. Every calculator out there felt outdated or paywalled, so I built 13 free ones (eBay, Etsy, PayPal, Stripe, Square, Whatnot, Depop, Poshmark, Mercari, and more), sourced every rate directly from the official fee pages with dates, and added a changelog plus free email alerts so sellers know the moment a marketplace changes its cut. No signup, no paywall — just the numbers. Would love your feedback!
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Really useful for someone selling across multiple platforms like I do, the fee comparison hub made it instantly clear which marketplace actually eats less of my margins. Love that it sources rates from official pages and tracks changes over time.
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The changelog with dates and source citations is a really thoughtful touch, shows you actually care about accuracy over just slapping numbers on a page.
Really useful for someone selling across multiple platforms like I do, the fee comparison hub made it instantly clear which marketplace actually eats less of my margins. Love that it sources rates from official pages and tracks changes over time.
The changelog with dates and source citations is a really thoughtful touch, shows you actually care about accuracy over just slapping numbers on a page.