Find completed sales
Match model, condition and included accessories. An unsold listing only proves what a seller asked, not what a buyer paid.
Check a flip before buying
A thrift flip starts at the purchase decision. Compare likely proceeds with all cash costs and how long the inventory might sit; an attractive asking price alone is not a sourcing thesis.
A workflow you can use
Enter the entire cost
Include what you pay for the item, the package, shipping you fund and any cleaning or repair. Keep your currency consistent.
Verify fee rules
Use the marketplace's current rules for your category and account. Some percentage fees include buyer-paid shipping; others use a different basis.
Stress-test the downside
Recalculate with a lower sale price and an extra return or repair cost. If the margin disappears, passing may be the better use of your cash.
Put the idea into practice
A concrete example
An item costs 18, sells for 45 and costs 8 to post. The leftover is smaller once you add fees and packing. Changing the expected sale from 45 to 35 can matter more than negotiating one unit off the purchase cost.
When to use the iPhone app
Sift's listing focuses on resale research, sell-through and visible buy-or-pass arithmetic. It describes estimating proceeds after platform fees and showing the sales evidence used for an estimate.
Know the boundary
This page does not fetch sold listings or know your marketplace's current fees. Enter the actual fee basis and rates from your account. Tax, returns and your time are separate costs unless you include them.
Resale profit and break-even calculator
The sale price is not the profit. Enter acquisition cost, postage, packing and the fee rules for your actual marketplace to see what remains. You can compare a conservative sold-price estimate with a hopeful asking price before committing cash.
Profit = item price + buyer shipping - percentage fee - fixed fee - acquisition - postage - packing - other costs. Fee basis is selectable; a positive margin is not proof an item will sell.
Inputs are processed in this page. Nothing is submitted to the app or a business. Download a result to keep it; this page does not automatically save your work.
What to keep in mind
This page does not fetch sold listings or know your marketplace's current fees. Enter the actual fee basis and rates from your account. Tax, returns and your time are separate costs unless you include them.
Explore Sift
Resale profit and break-even calculator
The sale price is not the profit. Enter acquisition cost, postage, packing and the fee rules for your actual marketplace to see what remains. You can compare a conservative sold-price estimate with a hopeful asking price before committing cash.
Open this toolCheck a thrift flip before buying
A thrift flip starts at the purchase decision. Compare likely proceeds with all cash costs and how long the inventory might sit; an attractive asking price alone is not a sourcing thesis.
Read this guideSift vs eBay Product Research
Use eBay Product Research to inspect the source evidence for an eBay sale. Use Sift when its scan and net-proceeds workflow suits your sourcing process. Verify questionable estimates against comparable transactions instead of treating either interface as a guarantee.
Read the comparisonTake the next step
with Sift.
Sift's listing focuses on resale research, sell-through and visible buy-or-pass arithmetic. It describes estimating proceeds after platform fees and showing the sales evidence used for an estimate.
View Sift on the App StoreThe current listing requires iOS 26.0 or later. Some features have additional device requirements. Check the listing and purchase screen for current availability and terms.