Coinhive Captcha
236 websites

Coinhive Captcha is free to use

https://coinhive.com/documentation/captcha

Coinhive is proof of work captcha widget, alternative to Google's reCaptcha. This prevents spam at an inconvenience that is comparable to a classic captcha and provides the added benefit of earning money from user's' form submission.

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NuCaptcha
470 websites

NuCaptcha is free to use

http://www.nucaptcha.com/

NuCaptcha is the next generation of Captcha security specifically designed to allow authenticated humans to pass quickly and easily while adjusting to a higher level of captcha security when a risk is detected.

Market Share by Top Websites

1 NuCaptcha is leading in The Entire Web.

2 Coinhive Captcha is leading in Top 100K Sites and Top 1M Sites.

Websites Categories

1 NuCaptcha has better usage coverage in more websites categories. Including Science & Education, Community & Society, News & Media, Health and 13 other categories.

2 Coinhive Captcha is leading in Computers Electronics & Technology, Games, Arts & Entertainment, Gambling and 2 other categories.

Geography

1 NuCaptcha is leading in most countries, including United States, France, Spain, Italy and 33 other countries.

2 Coinhive Captcha is leading in Brazil, Indonesia, Vietnam, Mexico and 30 other countries.