[Tepix]

When I was learning to read and write Japanese, I used the iOS app "Learn Japanese with Tako" by Grogshot games. They use gamification to make it fun. Very cute, check it out! (I'm not affiliated with them)

To improve your vocabulary while on the go (hands free) I heartily recommand the "Nemo" apps by Nemo Apps (e.g. "Nemo japanese"). They're available for both iOS and Android and for many languages. You can usually train the first 200 words for free.

[shawnps]

I'm a fan of the "Japanese" app on iOS for studying vocabulary - they have lists for each JLPT level. It's a great dictionary as well.