Been using Complete Ear Trainer for a couple months now. It’s basically an app that helps you develop your relative pitch and music theory knowledge. Pretty solid if you’re into that kind of thing.
Here’s what you do: there’s a bunch of different drills and exercises to train your ears. You can work on intervals, chords, scales, you name it. It’s got a nice progression system too – starts easy and gets more challenging as you level up. Took me a while to figure out some of the features but they’re actually pretty useful.
Look, if you’re a musician trying to improve your aural skills, you’ll probably like this. It’s not perfect – can get a bit repetitive after a while – but overall it does the job. Worth checking out.