During the next 24 hours, Clear for iOS will be free. Being its normal price is $4.99, getting the app now for free will let you download future updates.
Clear is designed to help you manage your life without adding clutter. It's a beautifully-designed, gesturally-driven app that we've created to improve on a pencil and notepad for flexibly keeping quick, simple todo lists. — Realmac Software
Download it here.