What are some alternatives?
When comparing Piano Academy and Chroma, you can also consider the following products
Simply Piano - Fast and fun way to learn piano
Pixie - Pixie is a free, open source web application that will help you quickly create your own website. Many people refer to this type of software as a content management system (cms), we prefer to call it a small, simple, website maker.
Flowkey - The easiest way to learn piano with your iPhone or iPad
Drop - Beautiful color picker with Touch Bar support
Scale Search by Solfej - Searchable library of over 6000 different scales
Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.