The free version includes 10 different response types, from multiple choice to drawing on a grid. You can then choose to show anonymous results in real time. For data analysis, upgrade to the paid version.
I used this recently and was impressed with the intuitive interface for myself as an instructor, and and for my participants. Learners were highly engaged with my content and I was able to adjust the talk based on the formative, immediate feedback I was receiving. This tool is definitely on my "must have" list!