Freemium UNDERSTOODIT is a multi-channel classroom response web app that allows teachers to track students' understanding during presentations. Teachers may opt for a simple Understood/Confused bar graph that students update in real-time throughout a discussion, create questions for students to answer at given intervals, or embed presentations to fine tune the understood/confused feedback to a particular piece of content. All polls and questions are available to students via a web url optimized for desktop, tablet, and mobile. A free account gets you 5 polls and 2 presentations per month. Sign up for a free 30-day trial of the Einstein plan which gets you unlimited presentations and polls for $15/month.