Hayba
ABOUT

# A toolset for rigorous worldbuilding.

## What is Hayba?

Hayba is an open-source toolset for building imaginary worlds with the same rigour a working geologist, linguist, or architect would apply to a real one. Tectonics that age right. Conlangs that obey real phonotactics. Cities that follow trade routes. Wired together by an MCP your LLM can drive.

## Why now?

World-building tools used to be reference apps — places to write down what you already knew. Hayba inverts that: you describe the constraints, the simulation discovers the world, and the workbench helps you author what the simulation can't infer. LLMs make this loop tight enough to be productive.

## Who builds it

A small team based out of zajalist. Currently one developer (Badr) plus the community on GitHub. Built on open standards: PostgreSQL, MCP, PHOIBLE for phonological data, Unreal Engine 5 for the in-engine plugin.

## License

The toolset is MIT-licensed. The hosted tier (cloud sync, share-links) is currently waitlist-gated while we shake out the first 50 users. Local tools are free forever and don't require any account.

GitHub → · Join the waitlist →