For eBay, Poshmark, Mercari & more
See your real profit
after every sale
Platform fees quietly eat your margin. MarginLog deducts them automatically — log a sale in seconds and know exactly what you made.
Start tracking freeResellers are already tracking with MarginLog · Free to start
Try the free fee calculators →Net profit this month
$1,284
Monthly profit · last 12 months
True profit tracking
Real net profit after platform fees, COGS, and shipping. Fee tables for eBay, Poshmark, Mercari, Depop, Etsy, and more — kept current.
Analytics that matter
Profit by platform, category, and month in one dashboard. Know exactly where your margin comes from.
CSV import & export
Upload a CSV export from eBay, Poshmark, Mercari, or other resale platforms — column names matched automatically. Export for tax season in one click.
Built for how resellers work
Split a haul purchase across items, log bundles with proportional revenue, and track returns that drop out of your totals automatically.
Sourcing trip ROI
Group sales by sourcing trip and see real net ROI after the cost of the trip itself. Know if Goodwill Tuesday was actually worth it.
Business expense tracker
Log shipping supplies, platform subscriptions, mileage, and more. Organized by Schedule C category so tax season is less painful.
Not ready to sign up? Try the free fee calculators — no account needed.