How do you define a world?

You ground it in locations.

Characters move through it.

Stories give it meaning.

Map its powers and conflicts.

Character Creature Species Family Collective Institution Location Object Construct Ability Trait Title Language Law Event Narrative Phenomenon Relation Map Pin Marker Zone

For everything, an element.

Every world lives somewhere different: notebooks, wikis, games, websites, brains. There is no standard way to structure them.

OnlyWorlds is a language for worldbuilding: one structure, local-first text files, readable by any application.

onlyworlds.com Create and host worlds with API access

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Atlas The primary workspace: build, write, map and chart your world

Obsidian Plugin Sync your world into Obsidian vaults and back

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EasyMobile Quick element editing from your phone

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Council Govern the schema with your world's characters

Try one of these, or build your own tools. The schema is open source with no restrictions. Access any world through the API, and build interfaces to it through developer packages and AI tooling.

Schema

API

SDKs

Docs

How do you define a world?

Tools & Ecosystem

Get Started