📄️ Overview
Require a captcha at sign-in, at sign-up, and before Casdoor sends verification codes, and choose when the captcha appears.
📄️ Default
Use the built-in image captcha of Casdoor, which needs no external service.
📄️ Cloudflare Turnstile
Protect sign-in and sign-up with Cloudflare Turnstile, a captcha alternative that respects privacy.
📄️ reCAPTCHA
Protect sign-in and sign-up with Google reCAPTCHA.
📄️ hCaptcha
Protect sign-in and sign-up with hCaptcha.
📄️ アリババクラウドキャプチャ
Protect sign-in and sign-up with Alibaba Cloud Captcha, with sliding or intelligent validation.
📄️ Geetest
Protect sign-in and sign-up with Geetest CAPTCHA V4.