Ans: Yes, all these apps can be used for free on Android. The free version of most of these apps will provide only the answers whereas the monthly or yearly subscription will give you stepwise solutions to math problems with a wide array of math types. If you are a daily user, then it is highly suggested that you get a subscription to these apps. These apps are very convenient to use. It is designed in a way that it would produce the most accurate answers with the minimum amount of errors.