I'll be sure to bring my calligraphy brushes and inks with me on the bus

Not that I don't agree, but something you can pull out while taking a shit or whatever has its own niche and helps keep your learning neurons firing.

I actually have an app I've used in the past that still works, Obenkyo. It does other stuff too, but I have mainly used it for Kanji practice.

There's a writing practice mode where it asks you to draw specific kanji based on on-yomi and kun-yomi and it lets you know if you fucked up the stroke order. The detection isn't perfect, but it's pretty good for practice on the go. I recommend grabbing a cheap stylus from a dollar store so you don't have to jab at the screen with your sweaty sausage fingers.

It lets you select lists of kanji based on JLPT levels but you can also load a .txt file with all the kanji you want to practice if you want something more tailored to the course you're taking etc.

I don't think there's been an update to the app in like 5 years which is why I wondered if there are any newer alternatives. Then again, it doesn't have microtransactions, ads, gamified Skinner box bullshit or social media integration so I guess that's not a bad thing :shrug-outta-hecks: