Plan
Conversational planning with an AI partner trained on Save the Cat for fiction, and structured frameworks for memoir, how-to, history, textbooks, study guides and other non-fiction.
storyline
Plan your book. Write your story.
A complete environment for writing books — fiction or non-fiction. Plan with proven structure, draft in a distraction-free editor, generate covers and interior images, and compile to professional EPUB and PDF. From first idea to finished book, in one place.
Choose your system to download:
Desktop app for Mac & Windows. Not available on iOS, Android, or in a web browser — Storyline runs as a VS Code extension on your computer.
Not sure which Mac you have? Click the Apple menu → About This Mac. If it lists an M1, M2, M3 or M4 chip, choose Apple Silicon.
From blank page to finished book
Most writers juggle four or five tools — a planning doc, a writing app, an image generator, an EPUB converter. Storyline replaces all of them with one environment built around the way books are actually made.
Write
Draft chapters in a distraction-free rich editor. Files stay as plain markdown on your disk — yours forever.
Illustrate
Generate book covers and interior illustrations with AI, styled to match your story or subject.
Compile
Export a professional-grade EPUB or print-ready PDF, with live preview as paperback, iPad and Kindle.
Plan with proven structure
Whether you’re writing a novel, a memoir, a how-to, narrative non-fiction, a textbook or a study guide, Storyline gives you a structured planning conversation matched to your form — never a blank template.
Fiction
- Save the Cat 15-beat structure — the framework behind countless bestselling novels and screenplays.
- Genre variants — Buddy Love, Whydunit, Golden Fleece and seven more, each tuned to genre conventions.
- Character-first — protagonist and supporting cast built before the beat sheet, so plot serves character.
- Two-pass scene outline — high-level approved first, then chapter-by-chapter with goal, obstacle, stakes and turn.
Non-fiction
- Book DNA — premise, audience, promise and through-line defined before you write a word.
- Form-aware pipelines — different planning paths for memoir, how-to, history, textbooks and study guides — each tuned to its conventions.
- Sourcing register — track every claim back to its source, with a verification status on each one.
- Skill trees and learning objectives — for textbooks and study guides, plan progression, prerequisites and assessment points before a single chapter is drafted.
- Timeline tools — chronologies and progression structures for memoir, history and biography.
A writing surface built for books
Markdown on disk, rich-text experience on screen. Your prose lives in plain files you own forever, edited through an interface designed for long-form writing — fiction or non-fiction.
- Live word counts — per chapter, per session, against your target. Always visible, never in the way.
- Inline notes — leave yourself reminders that travel with the text and surface in a single Notes view.
- Plan-vs-draft drift detection — when your draft diverges from the plan, Storyline tells you where and why.
- Research panel — capture sources, link them to chapters and scenes, see what backs every claim.
- GitHub auto-sync — every save is backed up to a private repository you control.
Illustrate without leaving the app
Generate the visual layer of your book inside the same workspace where you plan and write — covers, chapter art, diagrams, character portraits — all grounded in the work you’ve already defined.
- Book covers — front, back and spine with title, author and blurb, generated from your premise and genre or subject.
- Chapter illustrations — visualise key scenes or concepts with prompts that draw automatically from your outline.
- Style-locked output — keep visual consistency across every illustration in the book.
Package and publish
When the manuscript is done, Storyline assembles a publish-ready book — front matter, table of contents, chapter breaks, illustrations, cover — and outputs the formats you need.
- Professional EPUB — typography-aware, validated, ready for Kindle Direct Publishing, Apple Books and Kobo.
- Print-ready PDF — proper margins, page numbers, running heads, drop caps. Upload straight to a print-on-demand service.
- Live preview in three formats — see your manuscript as it will appear in paperback, on iPad and on Kindle, before you export.
Why Storyline
Plan and write in one place
No exporting an outline from one app and pasting it into another. The plan is right next to the draft, always.
Your prose stays yours
Storyline’s AI helps with structure and critique. It never reads your chapter prose, and never trains on it.
Open files, no lock-in
Your manuscript is plain markdown on your disk. If you ever leave Storyline, every word goes with you.
Free to start
Plan an entire book with AI on the free plan — no card required. Image generation, EPUB compilation and additional book plans use a simple pay-as-you-go credit pack.
Start writing your book today
Free download, free first plan. No subscription.
Choose your system to download:
Desktop app for Mac & Windows. Not available on iOS, Android, or in a web browser — Storyline runs as a VS Code extension on your computer.
Not sure which Mac you have? Click the Apple menu → About This Mac. If it lists an M1, M2, M3 or M4 chip, choose Apple Silicon.
By downloading you accept our Terms and Privacy Policy. Need help? Email darren@coxon.ai.