How the Flipify price tracker works
By Sam Salfi, founder of Flipify · Updated
- Products tracked
- 62
- Listings analyzed
- 8,365
- Currencies
- 13
- Marketplaces
- 6
What is the Flipify price tracker?
A free set of pages showing what used electronics actually sell for on local marketplaces. Each product page gives the typical (median) asking price, a fair range, price history, breakdowns by storage, condition and marketplace, and recent listings priced below market.
Where does the data come from?
From public listings on Facebook Marketplace, eBay, Kijiji, OfferUp, Gumtree, and Vinted, found by Flipify's marketplace monitoring while it watches for new listings for its users. We only use what a listing shows publicly: its title, price, condition, marketplace, link and when we first saw it. We never publish who was watching a listing, seller details, locations or photos.
How are listings matched to products?
Every listing title is resolved to a specific product, like "Apple iPhone 15 Pro" with its storage size, using cached matches and alias tables first and a language model for titles we haven't seen before. Accessories, parts, bundles, "wanted" posts and listings flagged as scams are excluded, so a case or a cracked screen never counts as the phone itself.
How is the typical price calculated?
It is the median asking price of matching listings, counting each listing once even if many people were watching it. Before calculating, we drop placeholder prices like $1 or $1234, then anything far outside the usual range and anything below half or above double the median. Breakdowns with fewer than 3 listings are hidden so no single seller's price is shown on its own.
Which products get a page?
A product gets a page once we have at least 15 distinct listings for it in one currency over the last 90 days. Pages never disappear: if listings dry up, the page stays with its last prices and says when they were from.
Why are prices shown per currency instead of converted?
Each currency is its own market of local listings. A used iPhone in Canada doesn't sell for the US price times the exchange rate, so converting would be misleading. Switching currency shows real listings from that market.
What counts as a deal?
A recent listing priced at least 10% below the typical price for the same model and storage size, and not so cheap that it's likely bait or broken (below half the typical price). Good deals usually sell within hours, so some may already be gone.
How often is it updated?
Every day. Prices are recalculated each night from the latest 90 days of listings, and the chart switches from daily to weekly points once a product has four weeks of history.
What are the limitations?
These are asking prices, not sale prices: buyers often negotiate below them. Matching is automated and occasionally wrong, especially for similarly named models. Products with fewer listings have wider, less certain ranges.