Launched this week
MarginLog
eBay says you made $50. MarginLog says $31. Now you know.
2 followers
eBay says you made $50. MarginLog says $31. Now you know.
2 followers
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.
Hey Product Hunt 👋
I built MarginLog after losing track of whether I was actually making money reselling.
The math sounds simple: sale price minus what you paid. But then eBay takes 13.25% + $0.30. Poshmark takes 20%. Shipping eats another few dollars. And suddenly the $22 profit you thought you made is actually $8.
MarginLog fixes this. Log a sale in ~30 seconds. It knows every platform's fee structure and does the math for you — true net profit, ROI, and which platform is actually worth your time.
What's free forever:
Profit calculators for eBay, Poshmark, Mercari, Depop, Etsy, Facebook Marketplace, and Vinted — no signup needed: marginlog.net/calculators
Compare all 7 platforms side by side: marginlog.net/calculators/compare
The full app (free during beta): https://marginlog.net
Log sales in 30 seconds
Dashboard showing profit trends and platform analytics
CSV export for tax season
Would love any feedback — especially from resellers who've tried other tracking methods (spreadsheets, notebooks, nothing). What's the biggest thing you'd want to see added?
MarginLog is live! Find it at: https://marginlog.net