See what you really made on every sale.
Marginvane is an inventory and cross-listing tool for small online resellers. Keep your stock in one place, list it on more than one marketplace, and see your profit after fees and costs.
Example sale, for illustration
What we're building
One inventory
Every item, quantity and cost in one place, with a full history of each stock change.
Cross-listing
List an item on eBay and Etsy from one screen, through each marketplace's official API.
Delist on sale
When an item sells on one marketplace, its other listings come down, to help you avoid overselling.
True net profit
Profit after fees, shipping and your cost. If a cost is unknown, we say so instead of guessing.
Email parsing
Forward supplier and order emails. AI drafts the items, and anything uncertain waits for your review.
Your data, your account
You connect your own shops with OAuth and can disconnect them at any time. We never ask for your marketplace password.