OWOX Model Canvas

A free, anonymous canvas to design data models — draw marts and joinable relationshipThe visual editor for Google's Open Knowledge Format (OKF) — Google shipped only a viewer; this is the authoring canvas. Draw tables and joins (or let AI draft them), then export a portable, git-friendly data model your LLM can actually read, so text-to-SQL stops guessing your schema. Opens Google's official GA4, Stack Overflow, and Bitcoin samples. Free, open-source, no sign-in is required