My team has developed Lifestack, a calendar app that leverages health data from wearable devices and smartphones to help users optimize their schedules based on their peak productivity times.
We recently launched on Product Hunt and achieved the #4 product of the day and the #1 product of the week in the Health & Fitness category.
https://www.producthunt.com/posts/lifestack
I'd love for you to give it a try and share your feedback!