it definitely helped a lot with my chord progression ear training. their hooktheory tab is completely free though and you can use that to practice with any of the songs in their database.

chord crush was great for learning the basics for me though since it comes with lessons that teach the foundation. but if youre already very experienced and want to just practice more advanced progressions you can just search through the hooktheory database.

I have not. I like to play ear training apps for chord progressions. I use Chet (lifetime purchase) and the free chord progression here (Route VI I think). I believe that they helped me quite a bit, but I have a nagging feeling that doing old school way that my rock teacher promotes would work out even better (listen to a real song and figure it out at least chorus part).

Tonegym’s strength is two-fold, 1) increasing difficulty as we get better in a gentle way, 2) different types of sounds (instruments).

Chet has single instrument tone, gamification to improve, but I am not completely sold to that. But it also has chord progressions in context drills (short excerpt of well known songs by their own cover musicians for 2-4 seconds and identify chord progression for that, and similarly for other drills such as intervals).

@Phil Derome
listen to a real song and figure it out at least chorus part that's actually an approach in ChordCrush, but simplified for beginners to start with defining one chord in progression and then extending to all chords.
I tried Chet as well, it seems like a combine of all ear training - melody, chords, etc. ChordCrush only for determining Progressions, it's like Route VI on anabolics.

I used to pay for Chord crush. I liked it but eventually fell out of using it. If you want to work on chord progressions specifically I would recommend it, however, I like ToneGym more because it's more comprehensive - not just chord progressions. The cool thing about chordcrush is you can do it with real chord progressions from actual songs on youtube.