How does this support UDL?
Doing in-class activities with Mentimeter allows those students who may have a fear of public-speaking to also have a voice. It also allows the teacher to get information from all students, because students may find it easier to answer the question through this method then my raising their hand and having all eyes on them. It also lets the students who don't want to look foolish to answer the question without stigma, even if they get it wrong.
Are there any requirements to sign up?
To be able to participate in the voting, all that is required is a web-connected device; a smartphone, a laptop, a tablet, etc. To create the polls, you have to sign up on the website, which collects no personal data and is open to all who have an e-mail address.
