The Open TableTop Initiative (OTI)

Welcome to the official home of the Universal Virtual Tabletop Specification (UVTT v2).

UVTT v2 is a modern, performant, and extensible system-neutral open specification for TTRPG campaign map data. It replaces legacy, flat-plane, single-file geometries with a multi-layered, topologically aware relational spatial database framework.

📖 Official Specifications

• Read the UVTT v2.0.0-rc2 Master Specification

🧩 JSON Schemas

Validate your VTT engines and map exports using our official schemas:

• Geometry Schema (geometry.schema.json)
• Entities Schema (entities.schema.json)

🛠️ Developer Tools

• Python & Go Reference Parsers
• Conformance Testing Suite

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Maintained by the Open Virtual Tabletop Consortium (OVTC)