The developer is giving this away for FREE for ever and won't be updating it for iOS 11
It's an educational app and a lot of musicians found it very helpful so it's best for as much people to have a go with it instead of just "killing" it. If you will want to use it after the release of iOS 11 you have to save some device with an older iOS.
Other iOS Free Apps:
Create beautiful designs and professional graphics with DesignLab. Choose from millions of images, graphics, fonts and customizable templates to produce stunning visuals, perfect for social media. It's fast, fun and easy.
RoomScan Pro is the only app with three great ways to get a floor plan, making sure it always gets the job done
TapMeasure – AR utility was $1.99
Meet TapMeasure, the spatial utility that combines computer vision and AR, creating a whole new way to capture and measure your space.
Tap Cam – Live Filters and Effects was $2.99
Tap Cam is the powerful camera with more than 50 live filters and effects to process images in real-time. Many useful tools like a zoom, delayed automatic release, continuous shooting, image stabiliser and a grid help you taking awesome pictures.
iOS Olli by Tinrocket was $1.99
Olli instantly turns your everyday moments into hand-drawn art and animations.
• Watch everything around you turn into an animated movie with Olli’s live preview
• Save your drawings and animations and share them on Instagram, Twitter, Facebook, Tumblr and Pinterest
• Simple, spontaneous, and fun to use
• From Tinrocket, creator of Waterlogue, This, Percolator, and Popsicolor for iOS
Features:
• 8 pre-set styles, each designed to bring a storybook quality to everything around you
• Import your own photos and videos from the Photos library
• Support for Apple’s Live Photos
• 2 supplemental style packs available for in-app purchase
• 1 free supplemental style pack, for an additional 4 styles
• Olli by Tinrocket’s unique and patented technology mimics the way artists see and draw
so it looks like Itunes for PC has removed the ability to download Apps and is now limited to songs, podcasts and videos. OMFGWTF why would you do that apple???