Story World Builder

Blucy Lab

In-app purchases

About this app

Story World Builder is a character, world, and plot planner for people who write webtoons and web novels.

• Your story's skeleton in one place
Character profiles and relationship maps, world settings, synopsis and scenario, episodes — keep the creative notes scattered everywhere in one app.

• AI writing assistant
Stuck? Ask the AI. Character names, world ideas, ways to move the scenario forward — design your plot together on six proven story structures.

• Talk with your characters
Chat directly with the characters you made to shape their personality and voice.

• Your data stays on your device
No sign-up needed, and what you write is saved on your device.
Only when you use AI features are the text you enter and that project's settings and character details sent to the AI service to process the request. We don't collect personal information such as your name or email.

• 한국어 · English · 日本語

Recommended for
- Writers preparing a webtoon or web novel series
- Creators juggling many characters and a complex world
- New writers who have ideas but don't know how to structure them

What’s new

Small fixes.

- Fixed "No details yet" showing on characters that only have a Memory filled in.
- On a tablet or foldable in landscape, Home, Settings, the Relation Map and more now spread out side by side so you can see everything at a glance.