Betty: a fully local copy-editing app for book-length manuscripts built on Qwen3.5 4B
ToothClassic7635 · reddit · 2026-10-06
A data scientist who self-publishes fantasy novels open-sourced Betty: a fully local, fully offline copy editor for book-length manuscripts powered by Qwen3.5 4B, benchmarked against planted errors across five languages, now with 30 users.
Three key engineering lessons: 1) Chunking — overlapping chunks to handle 120k-word manuscripts without losing context at edges; 2) AI misses genuine errors, so he layered LanguageTools and HunSpell on top to exhaustively surface spelling errors, letting the model focus on semantic slips like "There" vs "Their", with a Python script flagging common culprits; 3) the model introduces its own mistakes, so a Tinder-style accept/dismiss interface keeps the writer in the loop.
Open source on GitHub, downloadable at www.bethaniel.eu.
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