OOPSpam Anti-Spam API is a powerful anti-spam filter for contact forms, comment systems, live chat- the limit is your creativity!
OOPSpam Anti-Spam API's advantages over alternatives:
We also have a WordPress plugin, get it here: OOPSpam Anti-Spam – WordPress plugin | WordPress.org
Sucuri - Website Protection, Malware Removal, and Blacklist Prevention
Akismet - Akismet is a spam fighting service that protects millions of WordPress sites from comment and contact form spam.
Amazon CloudFront - Amazon CloudFront is a content delivery web service.
CleanTalk - Spam protection for WordPress, Joomla, Drupal, and any other websites
CloudFlare - Cloudflare is a global network designed to make everything you connect to the Internet secure, private, fast, and reliable.
hCaptcha - Do you use a captcha to keep out bots? hCaptcha is a drop-in replacement for reCAPTCHA that earns website owners money and helps companies get their data labeled.