Yotta is a scheduling app designed for telephone and online support organizations. It allows volunteers to see their schedules and provides suggestions for replacements if they are unable to fulfill their shift. The app also provides direct calling and emailing options to contact the suggested replacements. However, it is important to note that the app is only accessible to users who have an existing username and password. The app itself does not allow for scheduling changes, as these must be done through the Yotta website. Overall, Yotta is a useful tool for volunteer-based organizations to keep track of their schedules and ensure that all shifts are covered.