Questful is a smartphone app with which the audience of talks at conferences and events can post their questions and up-vote those of others. Furthermore the audience has access to additional materials like slides, pictures or links provided by the speaker. So gone are the times when you wanted to ask a question and didn't get selected.
On the other hand, the speaker can instantly see the most interesting questions of the audience at one glance.
Questful is also the ideal platform for getting across announcements and news at events and conventions to the whole audience.