Show HN: AIWriteBook – AI tool to write, design, and publish full-length books
aiwritebook.com
You can try it right away: the free tools (title generator, plot generator, character creator) work without signing up. Also, free account gives you a full 7 chapter book, no credit card.
I run a small publishing platform (NanoReads, 130+ published books, 341K readers). I kept seeing authors juggle 5 to 7 tools to publish one book: outliner, writing tool, Vellum ($250) for formatting, cover designer, TTS for audiobooks, keyword tool for Amazon. Nothing covers the full journey.
How it works: you enter a title and basic info. AI generates a structured outline with characters (arcs, motivations, voice) and a chapter by chapter story bible (events, locations, twists). You edit the outline (most important step). AI writes chapters one at a time using only the relevant character data and chapter spec. You can upload writing samples so it matches your voice. Then generate a cover, add illustrations, convert to audiobook, export as PDF/EPUB/DOCX.
Some technical details: we treat it as a compiler pipeline. Book metadata → character graph → chapter outlines → chapter content. Each step uses schema constrained structured output. Two model strategy: Gemini Flash for structural work (fast, cheap), frontier model for chapter prose (quality matters). Voice calibration uses writing samples as few shot examples plus extracted style features. Fiction and nonfiction have separate architectures. Fiction uses character graphs + plot continuity, nonfiction uses reference material extraction with citation tracking.
After 50K+ books: chapter sweet spot is 2,000 to 3,500 words. Outline detail sweet spot is 150 to 300 words per chapter. Romance and thriller generate well, literary fiction and humor are hard. Practical limit around 15 to 20 characters per book.
Stack: Next.js + Supabase. 30+ languages.
Happy to answer questions about the architecture, publishing space, or anything else.