"Upgrade every area of your life by learning the top insights from life-changing books in minutes, not hours."
Think it use to cost $69.99/yr (from Google cache) but appears to be completely free now.
"Optimize was acquired by Heroic Public Benefit Corporation. As part of Heroic’s mission to help create a world in which 51% of the world’s population is flourishing by the year 2051, the Optimize core wisdom membership is now free. Forever. No credit cards required. No strings attached. Period."
Web + Mobile app available