Hi @elnath78,
hi @twd,
at the moment we do not offer spam protection for any form plugins. We just protect for comment spam.
But both plugins have dedicated antispam pages which list all the possibilities:
https://docs.gravityforms.com/spam/
and
https://ninjaforms.com/blog/spam-wordpress-form/
Although the last one is mentioning us, we do not support Ninja Forms in any way (unfortunately). Maybe we can change that with the upcoming rewrite of the plugin in v3. But at the moment we do not support them (or any other form plugin) although we are listed there.
@wpninjasllc Can you remove us from this page to avoid confusion? Hopefully you can add us back in the future.
All the best,
Torsten