RateMate is a service that uses a series of yes/no questions to determine the optimal mobile device or car for a user's needs. It sold over 5 million mobile devices and cars in 2014 and allows users to compare products. RateMate aims to help users make better purchasing decisions by matching them with devices that meet their requirements, while also selling user data and statistics to manufacturers and potential partners like Amazon, eBay, and Alibaba.