Mentimeter
mentimeter.com
Live polls and word clouds that build on screen as people answer
slido.com
Collects audience questions and upvotes them so the best ones rise.
Put the code on screen, the audience opens a page and types questions, and everyone upvotes each other's, so you answer what the room wants rather than whoever spoke loudest. It also runs live polls, word clouds and quizzes, and embeds inside Webex, Teams, Zoom and Google Slides. The free tier caps an event at 100 participants and three polls plus one quiz, and will not export the results.
Questions
A genuinely usable free tier with paid plans for volume or team features. Free events allow 100 participants and three polls, and results cannot be downloaded afterwards.
Yes. Slido sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.
Free events allow 100 participants and three polls, and results cannot be downloaded afterwards.
Alternatives
Same category or same task, ordered by how closely they overlap.
mentimeter.com
Live polls and word clouds that build on screen as people answer
cal.com
Open-source scheduling links you can run on your own server
calendly.com
Send a link and let people book a slot your calendar says is free
doodle.com
Propose several times and let a group tick the ones that work for them
easyretro.io
Runs a retro as a board of cards people add, vote on and group
mural.co
A shared canvas of sticky notes for running a workshop remotely