AMP
1,555,834 websites

AMP is free to use

https://www.ampproject.org/

AMP stands for Accelerated Mobile Pages, a Google-backed project designed as an open standard for any publisher to have pages load quickly on mobile devices. Google officially integrated AMP listings into its mobile search results.

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Apple ITunes App Meta
626,882 websites

Apple ITunes App Meta is free to use

https://developer.apple.com/library/ios/documentation/AppleApplications/Reference/SafariWebContent/PromotingAppswithAppBanners/PromotingAppswithAppBanners.html

Apple Itunes App meta tag

Market Share by Top Websites

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

2 In terms of market share, Apple ITunes App Meta is clearly lagging behind, losing to AMP in all segments.

Websites Categories

1 AMP has better usage coverage in more websites categories. Including Arts & Entertainment, Science & Education, Games, Computers Electronics & Technology and 20 other categories.

2 Apple ITunes App Meta hasn't got a lead over AMP in any websites category.

Geography

1 AMP is leading in most countries, including United States, Japan, Russia, India and 157 other countries.

2 Apple ITunes App Meta is leading in China, Bosnia and Herzegovina, Virgin Islands, U.S., Guam and one other country.