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.

reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.

ALTCHA - ALTCHA is a free CAPTCHA alternative that uses a proof-of-work mechanism to protect your website, and online services from spam.

OOPSpam Anti-Spam API - The better, new standard to stop spam content.

Sblam! - Open-source implementation of server-side spam filtering of blog comments and forum posts.

Moderation API - Content moderation is tedious and time-consuming. The Moderation API uses artificial intelligence to analyze, detect, extract and even cover up all the kinds of data you rely on. Spend less time moderating with an AI-powered solution.