Tools
These tools all read and write the same world format, so a world can move between them: as a folder on disk, or through the API. Each tool works with its own part of it: a field, profile or view one tool shows can be missing in another. The live directory is at onlyworlds.com/tools. Built one yourself? List your tool.
Build and view
Section titled “Build and view”| Tool | What it does | Where |
|---|---|---|
| Atlas | The main workspace: build, write, map and chart a world that lives as a folder on your disk. | atlas.onlyworlds.com |
| Lantern | Your worlds on your phone, offline too: find, read and change them, and run a game at the table, where a player needs no account. | lantern.onlyworlds.com |
| Little Lens | Look at a world as a web of its elements and links, and at each element with what links to it and what it links to. It only reads: a public world needs no account. | little-lens.onlyworlds.com |
| Obsidian plugin | Each element is a markdown note in your Obsidian vault, syncable with online worlds. | GitHub |
| onlyworlds.com | Accounts, world hosting, keys and the API. | onlyworlds.com |
Learn and govern
Section titled “Learn and govern”| Tool | What it does | Where |
|---|---|---|
| Explorer | An interactive 3D introduction to the standard and the ecosystem. | explorer.onlyworlds.com |
| Council | Governance of the standard: motions, precedents, amendments and votes by characters from your worlds. | council.onlyworlds.com |
Play and showcase
Section titled “Play and showcase”| Tool | What it does | Where |
|---|---|---|
| Tactical Tangle | A hoplite battle game where your OnlyWorlds characters fight in the ranks of a phalanx. | tangle.onlyworlds.com |
| DCC Viewer | A parsed book series (Dungeon Crawler Carl) explored as a 3D world graph. | dcc.onlyworlds.com |
Integrations
Section titled “Integrations”| Tool | What it does | Where |
|---|---|---|
| Foundry Converter | Converts a world folder into an installable Foundry VTT module. | GitHub |
| Azgaar Converter | Turns an Azgaar Fantasy Map Generator export into a world, with a map and pins. | GitHub |
| Unity SDK | Typed C# models and a client for worlds in the Unity engine. | Unity SDK |
Bring in your notes
Section titled “Bring in your notes”Three ways to turn notes you already have into a world, none of them needing code:
- An AI assistant, then Atlas. Ask a chat assistant to turn your notes into OnlyWorlds JSON (give it the LLM guide, or use OnlyWorldsBot), then in Atlas, before you have a world, Other ways in → Bring in a file, notes or JSON: you review what it read, and Create world makes the world.
- The toolkit’s
import, if you use Claude Code or another coding agent: it reads notes, a manuscript, PDFs or a wiki and writes a world folder Atlas opens (Toolkit). - One note at a time, in Lantern: Catch keeps a note in a world, and Sort your notes has an AI propose the elements it makes.
For AI tooling see AI agents, the MCP server and the Toolkit.
Retired tools
Section titled “Retired tools”Older tools, most still online but no longer developed, are on the Legacy page.