Apps
A couple of little apps I built for myself while learning Japanese, shared here as extra resources. They're homemade developer builds — not polished store releases — but they work.
YappyJappy Japanese learning A chat partner for practicing Japanese — furigana over every kanji, gentle corrections, and readings the moment you need them. View app 
TapLex Language learning Draw a box over any on-screen text — a game, a manga panel, a menu — and tap the words to get readings, meanings, and a pop-up dictionary right where you're reading. View app These are Android apps you install by sideloading — download the file and open it on your phone. Each app's page has step-by-step install instructions. They're free; some need an API key you provide yourself.