I'm using DroidAnki on my phone as part of my efforts to learn Mandarin. It took a bit of time to figure out how best to configure it, but now that I have it tuned to my liking, it's a great tool. It's not the only tool I've been using, but it's one of the most helpful.
My dad did these jobs his whole life. He's in still in better shape than I've ever been and has a union pension better than anything any company has ever offered me.
It's Daniel Gackle who is personally responsible for the toxic Hacker News culture.
https://blog.ycombinator.com/meet-the-people-taking-over-hac...