Phia

Phia is a price-comparison browser extension focused on fashion and luxury. It is published on the Chrome Web Store by the owner of phia.com and is distributed free of charge. The workflow is deliberately small: while browsing any online store, you click the "Should I Buy This?" button and Phia runs a check on the product you are already looking at. It compares that item to current listings from both retail and secondhand marketplaces, and if the price looks high it presents lower-cost alternatives on the spot, so you never lose the page you were on.

The secondhand side is where Phia places most of its emphasis. The extension says it draws on a database of over 250 million secondhand items and connects users to deals from 150+ resale platforms, naming partners such as The RealReal, eBay and Poshmark. It also layers AI over that data to read pricing trends and resale value, showing how an item compares to historical sales and how well a given brand tends to hold value on the secondary market. Saved items can be monitored so you get notified when the price drops.

Phia is an independent third-party product, not an official service of any brand, retailer or marketplace it surfaces. It is monetized through an affiliate model — when you click a product link and buy, Phia may earn a commission from the resale platform, which is how the extension stays free. The store listing shows a large user base of roughly 40,000 users with a 4.9-star average from 185 ratings, and the extension is under active development.