I loved the app and purchased it to help my son keep up with studying. I paid for the premium account which indicates you can log in on multiple devices both iOS and Android. After setting it up on my phone, which was easy but took some time,when I tried logging onto my son's phone it didn't recognize the account. I contacted customer service but didn't hear back. It's a nice app, really like the features, so this was really disappointing. I could set it up again on his phone but without me being able to monitor on my phone it's not helpful. I still hope someone can help me fix this or I should get a refund for my purchase.