PriceCharting has a collection tracker. Collection value is updated instantly when our prices change. See what you own while searching/browsing the site. Thanks to all /r/gamecollecting beta users for your help testing

PriceCharting Collection Tracker is a free, unlimited tool for tracking the value of video games, Pokémon cards, comics, and more. It offers features like barcode scanning, photo support, historic value tracking, and easy editing of item details. Users can also track sales, log profits, and share their collections with others. Premium features include price change alerts, custom folders, sorting by price change, grading recommendations, and advanced collection dashboards.