emanchado
I have actually been thinking of buying some domain and having a public installation that anyone can use (I'd have to change some things, like add a "Forgot password" feature and such)... but I'd have to pay for it myself, and it might become a maintenance burden. So I dunno.
I did know Storium! It's very similar indeed but I decided to write my own because it didn't quite fit my vision.
1) I have an intense hate for challenge-based RPGs, and I hate when players have to do math or focus on calculating if they have enough points of whatever nonsense to reach some target.
2) I didn't want players to write part of the story text themselves because I wanted all that text to have a single voice/style. NARROWS has a way to "export" a narration as a kind of novel, and it reads more or less like a normal short story.
3) I wanted it to feel as immersive as possible, and have as little UI (for the readers) as possible. Having an audio track and a background image for every chapter was important to me. It might be a petty thing, but as I had decided to write my own anyway...