Arturia remembered that they made an Arturia iSpark app today, and made it free to everyone! It seems like they had forgotten about it entirely since 2017. Alto Sax Prompter is a study aid for learning to play the Alto Sax, which has seen regular updates over the years, and is now free today! They're joined by some decent sales on Keystage, the FAC effects (mostly the macOS versions), and Fader Command!
Since iSpark hasn't changed at all in the intervening years, here's a 36 year old Jakob Haq showing off the app. This is from when he had joined forces with The Sound Test Room, and before his first grey hairs.