Keepa
Keepa is a third-party service that tracks the price, Buy Box, and sales-rank history of Amazon products over time and presents it as charts and exportable data.
Keepa's value is history. A single Amazon page shows you today's price and rank; Keepa shows how those numbers have behaved for months or years, so you can tell a stable, proven seller from a one-off spike. Sellers read Keepa charts to judge demand consistency, price stability, how often the Buy Box rotates, and whether Amazon itself competes on the listing.
Keepa data can be exported to CSV for bulk analysis. Those exports use a custom time format (minutes since the start of 2011) that breaks when you open it in a spreadsheet — which is why a dedicated Keepa time converter is useful.
Reading charts one product at a time is fine for a handful of ASINs; for a long list, sellers screen the exported data in bulk instead. Gridwinner works straight from a Keepa CSV — your export, not a live connection — so a whole file can be vetted at once.
Frequently asked questions
- What does Keepa do?
- Keepa records the historical price, Buy Box, and sales-rank of Amazon products and shows it as charts, so sellers can assess demand and price stability over time rather than from a single snapshot.
- Why is Keepa time hard to read in Excel?
- Keepa stores timestamps as the number of minutes since the start of 2011, not as standard dates, so a raw export shows large integers instead of readable dates until you convert them.
- Does Gridwinner connect to Keepa directly?
- Gridwinner analyzes the Keepa CSV data you export, processing it locally in your browser. It works from your exported file rather than a live Keepa connection.