Facebook Comments
333,844 websites

Facebook Comments is free to use

http://developers.facebook.com/docs/plugins/

Facebook's Comments box lets people comment on content on your site using their Facebook profile and shows this activity to their friends in news feed. It also contains built-in moderation tools and special social relevance ranking.

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HyperComments
3,002 websites

HyperComments offers both free and paid options

https://www.hypercomments.com/

Hypercomments allow realtime commenting on a word or selected text fragment.

Market Share by Top Websites

1 Facebook Comments is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, HyperComments is clearly lagging behind, losing to Facebook Comments in all segments.

Websites Categories

1 Facebook Comments has better usage coverage in more websites categories. Including Computers Electronics & Technology, Arts & Entertainment, News & Media, Science & Education and 20 other categories.

2 HyperComments hasn't got a lead over Facebook Comments in any websites category.

Geography

1 Facebook Comments is leading in most countries, including United States, Russia, Vietnam, Brazil and 162 other countries.

2 HyperComments hasn't got a lead over Facebook Comments in any country.