Google Customer Reviews
3,200 websites

Google Customer Reviews is free to use

http://www.google.com/trustedstores

The Google Trusted Stores program helps you identify online stores that deliver a good experience. When you buy from a Google Trusted Store you can choose free purchase protection from Google.

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Stamped
23,686 websites

Stamped offers both free and paid options

https://stamped.io/

Stamped.io is a User Generated Content platform for commerce websites. It allows users to collect genuine reviews of products, with automated survey and in-email forms, so customers experience a simple and easy reviews process, right from t...

Market Share by Top Websites

1 Stamped is leading in Top 100K Sites, Top 1M Sites and The Entire Web.

2 Google Customer Reviews is leading in Top 10K Sites.

Websites Categories

1 Stamped has better usage coverage in more websites categories. Including Lifestyle, Food & Drink, Sports, Health and 20 other categories.

2 Google Customer Reviews hasn't got a lead over Stamped in any websites category.

Geography

1 Stamped is leading in most countries, including United States, United Kingdom, Australia, Canada and 130 other countries.

2 Google Customer Reviews is leading in Gabon, Mali and Yemen.