Grey bar bottom of screen
iPhone 6s, iOS 9.2.1
It may be under Settings - Notifications on the app
http://www.tomsguide.com/faq/id-2381564/add-services-timehop.html
I Have all notifications turned off. Everywhere I could find them.
The apps' ability to send notifications is usually governed by the overall Settings - Notifications area
If you have it turned off there as well as in the settings of the app - then I am at a loss to understand how this is showing up
Grey bar bottom of screen