Work out margins, fees, profit and break-even points in seconds. Everything runs in your browser, so nothing you enter is sent anywhere.
Quick answers from two or three numbers.
Full seller workflows with fees, shipping, returns and ad spend.
See what each marketplace takes from a sale.
Know your conversion rate, then see what improving it is worth.
See what your ads return and where they stop being profitable.
Find what a customer is worth, then whether it is worth what you pay to win them.
Plan a test before you run it, then judge the result properly.
Add or remove tax from a price.