All In One Captcha is the best WordPress plugin to add Google reCAPTCHA, Cloudflare Turnstile, hCaptcha, Math Captcha, or Slide Captcha to your WordPress site. It is a simple and easy-to-use captcha plugin that comes with built-in captcha verification, automatic browser language detection, error message customization, and other useful features.
Besides default WordPress forms like Login, Registration, Forgot Password, and Comment forms, All In One Captcha works for WooCommerce, Easy Digital Downloads, BuddyPress, bbPress, WPForms, Contact Form 7, and other popular forms.