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I've created a free mobile app that lets you check prices for any product called OneScan. All you have to do is scan the barcode of an item with your phone's camera or search for it in the search bar of the app. It will pull live prices from Amazon, Best Buy, Walmart, and eBay if it finds a match. If you only want to use the barcode scanner feature, you don't even have to login. However, if you do login, you can use the search bar feature and we provide daily deals and track your past scans. You can even order items for in store pickup if you prefer to drive in. Both options are free as I do not have a premium option and I do not sell data. Please let me know if the app is intuitive to use and "pretty." It is still in its early MVP stage so there will be many changes coming tied to all of your feedback. You can download it from the website (Also looking for feedback on the website too!). For anyone curious, it was done entirely in Flutterflow with GCP as the backend.
https://onescanapp.com
I would pay good money for something like this that could instantly compare prices with Walmart/FreshCo etc. to tell you immediately if the same product is same price or cheaper in other stores by just scanning the barcode.