I recently released JazzEar, an iOS app for ear training. Specifically focuses on improving recognition of chord progressions you would hear in jazz standards.

https://jazzear.com/

Now I'm working on a smaller app for jazz musicians to manage their tune list and act as a tool to help practice and review tunes. I wanted this app to tell me what tunes on my list I haven't played in a while (and might forget), or try different keys or exercises on the tune and track what I found difficult.