Typing apps to help with writing. Ideas, please?

Hello, 

My gorgeous 7 years old is not keen at writing at all. He finds it tedious and his handwriting is never consistent. I know that school needs to encourage it and we get a lot of handwriting sheets to work on.  He may have dyspraxia and we are waiting for him to be seen by his paediatrician after Christmas. That may be causing his difficulties. In the meantime, I feel he would benefit more from learning how to type. I understand that doesn't guarantee he will fall in love with writing but I believe it is worth trying.

Could you suggest any typing apps for children, please?