Anti-spam check the robots by behavior. No captcha. Antispam let robots do so as a human can't do.
Antispam let robots do so as a human can’t do.
GitHub: https://github.com/EugenBobrowski/antispam
Upload the Antispam plugin to your blog, Activate it, then use it.
1, 2, 3: You’re done!
Release Date – 29th December, 2016
Release Date – 24th November, 2016
Release Date – 30rd May, 2016
Release Date – 25rd May, 2016
Release Date – 11rd May, 2016
Release Date – 23rd April, 2016