Quilty-Louise

Do you have an Android phone and use any quilting apps?

I am getting a new phone tomorrow that is an Android smartphone
and have heard about many different kinds of "quilting" apps you
can get for them.

What I would like to know is:

1) Do you use any?
2) Which one(s) do you use?
3) Which do you like the best?
4) Which do you like the least?
5) Are they difficult to use?
6) How helpful are they for you?

Thanks in advance for all your input on this topic.

I really hope that I can make good "use" of the Android smartphone
with my desire for quilting/sewing.