For the name, think about Clear. They didn't choose "Task" anything because that's not their target; instead, their customers want to be clear about what to do, and clear it off their list. Very smart name IMHO. (On the other hand, the Task app chose "Task" so YMMV).

In the download email address area, don't worry about it yet -- I'm not the typical UI case because I'm on Chrome Ubuntu KDE.

Price: A/B testing is good. Bandit testing is better.

Differentiate from Clear tips: download Clear, use it, then write what your app does that's different. Or ask some friends to use Clear, then ask what they'd pay for you to change, then build that.