Vaia レビュー 

Customer service sucks, I had trouble cancelling it and it's most certainly not worth the money.

The app isn't a scam, but the AI is incredibly unreliable. It told me that the movements in the sagittal plane occur around the sagittal axis, which is 1000% incorrect! Movements in the sagittal plane occur around the coronal axis!!!! This makes the platform completely useless to me, especially since this was the first flash card that the AI made for me.
AI is not good, don't use it.

Without my consent, they collected my personal data and added me to their mailing list. This happens regularly now and gives cause for concern regarding these companies.