Worthless, the thing about a mobile app is that it's mobile, in today's world any college student is on the go and needs to get their work done on the go. You would think that having a mobile app you would be able to complete your assignments this is not the case. I use an iPad for EVERYTHING and got by just fine until I took medical terminology through mindtap and all my assignments need to be done on a computer. This is a shame, and in my opinion very crappy of cengage.