What is the app that tells you if a product is bad or not?

Have you ever come across an app that acts as a watchdog for consumers, alerting you to potential issues with products you might be considering purchasing? If so, I'm curious to know more about this tool. Can you tell me the name of this app that serves as a guide to help identify problematic products? Additionally, what kind of information does it provide to make such determinations? And, most importantly, how reliable are the assessments made by this app in terms of accurately flagging flawed or subpar products?