Can anybody recommend a good android app for helping with first phonics and maybe letter tracing? DD used pocketphonics on my iPhone which was great, but both kids got a Nabi 2 for Christmas and I want to put something on there for DS, aged 3. Because of the way it's set up I can only use the Amazon App store, not Google Play, so I can't get Read Write Phonics which I've seen recommended elsewhere. Any suggestions would be great.