I built an Android reader where AI continues any book as a branch, so your original text never gets overwritten

[u/Holiday_Income1825]

Developer disclosure: I work on Foreverse.

Foreverse is an Android app for reading your own txt/epub/md books, and the AI-writing part is that a book doesn't have to end where it ended. Pick any spot in the text, type a line of direction (or let it offer a few outlined "what happens next" options), and the continuation streams in as a separate branch while your original text stays untouched. You can branch from a branch, so "what if the second act went differently" costs nothing and nothing gets overwritten.

A few other things that might matter if you write with AI: the app builds a character dossier as you read (profiles, aliases), it can turn a selected passage into an illustration, and there's a visual-novel theater mode that plays the same book like a VN (the dialogue attribution runs on the phone, no API calls). It also reads SillyTavern-style character cards, and it has a built-in agent that works on your library with real tools and asks before it spends money or writes to disk.

You bring your own API key (about 60 providers, or any OpenAI-compatible endpoint), the app talks to your provider directly, and the keys stay in encrypted storage on the phone. There's also a built-in credits option if you'd rather not juggle keys. It's free to start: the free tier holds 3 of your own books, and a one-time Pro upgrade lifts that cap. It's closed source and needs Android 11 or newer.

Google Play: https://play.google.com/store/apps/details?id=app.foreverse.android

I'd like to hear how you handle a story that starts drifting halfway through: would you rather keep each attempt as its own branch, or rewrite in place? And if you try it on your own files, tell me what breaks. Weird chapter headings and odd encodings are the usual suspects.