Doplab

Source: https://doplab.unil.ch/speakup/ Parent: https://doplab.unil.ch/

\ The SpeakUpapp encourages speaker-audience interaction by Providing a single location-based message-board classroom that allows anyone in the room to anonymously post messages, comments. SpeakUp also Provides a rating mechanism that allows users to vote on messages and answer polls (more details on speakup.info).

Available for iPhone (here)  and for Android  (here) or the web (here).