What is the free app to check fake products?

Excuse me, I'm curious about a particular topic. Could you tell me, is there a free app available that allows users to verify the authenticity of products? Perhaps it uses some form of barcode scanning or product serial number verification to combat counterfeit items. I've been hearing more about fake products in the market, and I'm interested in finding a convenient way to ensure the authenticity of my purchases. Could you recommend such an app, and perhaps elaborate on its features and how effective it is in detecting fake products?