Hi, just thought I’d mention perhaps the only non EET app that’s worth bothering with- it’s called PlayByEar, written by a trumpeter from Altanta called Rick. A basic version is on his website iwasdoingallright.com, but he’s done an awesome job on his app.
PlayByEar will play you an interval, chord or melody, which you copy on your instrument, then it gauges how you did. For a free app, it has full functionality, which is great. Loads of features, you can move the tonal centre for Eb/Bb inst. calibrate ghe mic for quiet/ loud inst. etc. using it with my alto sax, I found it would help with intonation as it’s looking for the notes being spot on. My daughter has used it for singing too. Anybody else used it?? Or have other recommendations?