Market Movers (https://marketmoversapp.com) is a tool created by the Sports Card Investor group that they reference and display often in their YouTube videos.
The tool allows you to track your collection, and automatically keep tabs on pricing trends for the cards in your collection or any that you want to follow. The tool also allows you to follow the trends on sealed wax products, but you’ll need the Pro subscription to do so.
This tool isn’t for the casual collector, but those that are more serious about trying to identify trends that may not be evident at first glance and make money off of those trends.
Access to this application isn’t cheap, as it will cost $25USD a month for their basic (or ‘Lite’ as they call it) plan and $50 per month for their Pro subscription. I personally haven’t used the product, but I do plan on giving it a try at some point, and will post a review in the Thoughts section.