But be warned - it is still very rough around the edges, and still very much a work-in-progress. (I'm only working on it in my spare time as a side-project.) It's definitely not ready for prime time yet, and won't be for quite some time still.
That said, I do already have users. One of my users is using it to help him consume native Japanese content really early. He's learning Japanese since September of last year, and he started using my app a few months ago (probably a month or two ago; not sure, I'd have to check) and he's already reading some of the easier Japanese visual novels and web novels, and watching anime with only Japanese subtitles.
This - I personally believe - is the best way to learn a language: by immersion. So I always wanted to make an app that will short-circuit the process and will allow you to start consuming content a lot earlier that you'd ever be able to do using only traditional methods.