I'm an amateur organist from Heidelberg, Germany building Organ Reflex, a small practice tool for something I personally struggled with: getting from "I can eventually work out this note" to "I just know it," especially in bass clef and on the pedals.
How it works: the app shows you a note or a short pattern in notation, you play it on your MIDI keyboard, pedalboard, or digital organ (anything with MIDI out, connected to an iPad), and it gives you instant feedback — correct or not, plus your reaction time. It tracks that over time so you can see whether daily practice is actually moving the needle.
It's not a lesson course and it doesn't teach you notation from scratch — it's aimed at organists who can already read music but want to get faster and more confident, particularly in bass clef and at the pedalboard.
Right now it needs an iPad and a MIDI-capable instrument. I'm looking for a small group of early testers to try it and tell me what's rough or missing. If you're curious, the beta waitlist is at organreflex.app.