See what changed, who's cheapest, and what it does to your margin.
Compare your supplier's price list over time, or compare quotes from multiple suppliers for the same purchase — add selling prices and see the margin impact on every affected item.
CSV or XLSXNo account requiredFiles stay in your browser
Example data — illustrative only
Two ways to compare
Price Change
Compare an old and new price list from the same supplier. See increases, decreases, new and removed items, and the margin impact of each change.
Supplier Comparison
Compare quotes from multiple suppliers for the same items. See the cheapest supplier per item, coverage, and potential savings across suppliers.
What CostRift shows you
Detect cost changes
See increases, decreases, new and removed items — with ambiguous cases flagged for review.
See margin impact
Map selling prices and see exactly how each cost change moves your margin.
Protect your margin
Get the target selling price to preserve your previous margin on every affected item.
Export the comparison
Export filtered results to CSV for review in your own workflow.
How it works
- 1Add your previous and updated price lists from the same supplier — CSV or XLSX.
- 2Map the SKU and cost columns for each list.
- 3Review changed, added, and removed items and their impact on margin.
Private by design
On your device
- Your files stay in your browser.
- Supplier price lists are processed locally.
- Your files aren't uploaded to CostRift servers.
No account needed
- No account is required to compare price lists.
Flagged, not guessed
- Products are matched conservatively by SKU, and ambiguous cases are flagged for review.
Frequently asked questions
What file formats does CostRift support?
CSV and XLSX. Drop in your previous and current supplier price lists from emails, downloads, or supplier portals.
Do my supplier files leave my browser?
No. Supplier price lists are processed locally in your browser and are never uploaded to CostRift servers. No account is needed.
Do I need selling prices?
No. Comparing costs works with just SKU and cost columns. Adding selling prices unlocks margin impact and target selling price calculations.
How does CostRift match SKUs?
Products are matched by SKU. CostRift first tries the SKU exactly as written in each list; if there is no clean match, it retries with a normalization that trims outer whitespace and ignores ASCII letter case (for example sku-123 and SKU-123). When a clean match is not possible, the rows are left unresolved for review — nothing is guessed.
What happens with duplicate or ambiguous SKUs?
Rows with duplicate or ambiguous SKUs are not paired arbitrarily. They stay unresolved and are flagged in the results for you to review.
Can the two files use different column names?
Yes. The previous and current lists are mapped independently, so the SKU, cost, and selling price columns can be named differently in each file.
Can I compare price lists from different suppliers?
CostRift is designed to compare an older and a newer price list from the same supplier. Comparing unrelated supplier catalogs can produce misleading matches, because SKUs and product definitions can differ.
Can I compare multiple suppliers?
Yes. Supplier Comparison compares quotes from multiple suppliers for the same items and shows which supplier is cheapest for each one, along with coverage and potential savings across suppliers.
Compare supplier quotesCompare a previous and current supplier price list and see every change and its margin impact.
See how a supplier price increase affects your margin.
Compare supplier prices together in a shared workspace for your team.