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A review aggregator is a system that collects reviews of products and services (such as films, books, video games, software and hardware). This system stores the reviews and the uses them for different purposes such as: creating a website for users to view the reviews, selling information to third parties about consumer tendencies and creating databases for companies to know about their actual and potential customers. The system enables users to easily compare many different reviews of the same work. Most of this type of systems calculate an approximate average assessment, usually based on assigning a numeric value to each review according to the degree of positivity toward to the work.

Examples of review aggregators include Metacritic, Rotten Tomatoes, Game Rankings, and ProCompare.

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