Free and open source

Build worlds.
Bind them
into books.

Book Builder is a free, open-source workshop for long-form stories. Plan your book on a corkboard, write it in an editor set like the finished page, keep its characters and systems close at hand, and share it with readers.

One home for BooksPartsChaptersCharactersPlacesSystems

01 — How it's organized

Every piece of your story has a shelf.

A book breaks into parts, a part into chapters — or a part holds its own story text, the way a prologue does. Characters, places and systems live right beside them.
Book The Glass Armada
Prologue Story text
Part One — The Drowned Moon 3 chapters
1Salvage Rights
2A Map of Dead Stars
3Burn Through
Part Two — The Hollow Sun 4 chapters
6 Characters 4 Places 2 Systems

Parts

Split a book into acts, eras or books-within-books. A part can hold chapters, or carry its own story text.

Chapters

Every chapter knows the part it belongs to, so the whole book stays in order as it grows.

Story bible

Give every character, place and system its own page, and carry them into every book they walk through.

Mentions

Names from your story bible link themselves as you write, so a hover shows their card. Type @ to add someone new.

Connections map

Your story bible as a web: who's family, who's a rival and who owes whom. Every line says how two are tied, and takes its colour from it.

  • Family
  • Allies
  • Rivals

02 — The editor

Write where the story lives.

Open a chapter and write in an editor set like the finished page, or go full screen in focus mode. Then read it back, or share it, in reading mode.

Fonts, sizes, colours and highlights A drop, raised or boxed first letter Reading mode, with a link to share
The Glass Armada / Part One / A Map of Dead Stars Saved

A Map of Dead Stars • Chapter 2

In which the beacon wakes

The beacon had been calling for three hundred years before anyone thought to answer. By the time the Meridian dropped out of the lane the signal had gone quiet, and Captain Juno Halley set down her coffee and looked into the dark.

“That isn't a distress call,” she said, though no one had asked her.


By the next watch the whole crew had a theory and none of them had a plan

Version history

Every chapter keeps its earlier versions as you write. See what's changed since one, and bring it back.

03 — The outline

See the whole book at once.

Lay your book out as a list or a corkboard. Drag chapters between parts, give each a status and a cast, and write synopses right on the cards.

Drag parts and chapters into place Track every chapter from idea to done Paste in an outline you already have

04 — Focus, goals, insights and share

Close the door, then open the book.

Focus mode

A full-screen page with nothing but your words: typewriter scrolling, dimmed paragraphs, rain or a fire to write beside, and a timer for writing sprints.

Your author page

Your name, a short bio and every book you've shared, at an address of your own. Private until you switch it on.

Writing goals

A daily word goal with a streak to keep, and a target and deadline for each book that says how many words a day it will take.

Manuscript insights

Your chapter pacing, the words you lean on, who drifts off the page and a word map for each character, counted from your own text.

05 — On the shelf next

Coming soon.

Soon

Find and replace

Change a word or a name across your whole book at once, with a look at every match first.

Every saga starts
as a single page.

Build books and share them with others. Free to use, open source, and yours to shape.