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MarginLog
eBay says you made $50. MarginLog says $31. Now you know.
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.
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?
About MarginLog on Product Hunt
“eBay says you made $50. MarginLog says $31. Now you know.”
MarginLog was submitted on Product Hunt and earned 0 upvotes and 2 comments, placing #127 on the daily leaderboard. 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.
On the analytics side, MarginLog competes within Productivity, E-Commerce and Finance — topics that collectively have 699.5k followers on Product Hunt. The dashboard above tracks how MarginLog performed against the three products that launched closest to it on the same day.
Who hunted MarginLog?
MarginLog was hunted by Ahmed Saqib. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of MarginLog including community comment highlights and product details, visit the product overview.
Ahmed Saqib
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?