Trending @Capgemini; Peakon

The survey by itself is anonymous.

I get to see the responses if at least 10 reportees have participated in the survey. The responses I see are not associated with individuals.

If you are careful about not revealing specific details about your circumstances in the comments, your N+1 will not be able figure out who are the responses from.

There are ways to narrow down person who has submitted survey

It's reaches the people manager, but without your identity.