MarginLog

What it does

Resellers on eBay, Poshmark, Mercari, and 4 other platforms constantly underestimate how much fees eat into profit. MarginLog lets you log a sale in 30 seconds — sale price, what you paid, shipping — and shows your true net profit after every platform fee, automatically. Free during beta. No card required. Also includes free profit calculators for all 7 platforms — no signup needed.

Track true profit on every sale across eBay, Poshmark, Mercari, Depop, and more. See real net profit after platform fees, COGS, and shipping — free.

Platform fees quietly eat your margin. MarginLog deducts them automatically — log a sale in seconds and know exactly what you made. Real net profit after platform fees, COGS, and shipping. Fee tables for eBay, Poshmark, Mercari, Depop, Etsy, and more — kept current. Profit by platform, category, and month in one dashboard. Know exactly where your margin comes from. Upload a CSV export from eBay, Poshmark, Mercari, or other resale platforms — column names matched automatically. Export for tax season in one click. Split a haul purchase across items, log bundles with proportional revenue, and track returns that drop out of your totals automatically. Group sales by sourcing trip and see real…from marginlog.net

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