Are there any close or better open source solutions like Google Invisible reCAPTCHA V2? And also, how does Google regularly reCAPTCHA V2 (checkbox one)?
SecurImage or phpcaptcha is an open source alternative for Google reCaptcha v2. But I don't think there is an alternative to Invisible reCaptcha. You can refer to This for some good alternatives for reCaptcha v2 (although most of them are not open source).
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