What is Yellow?

Yellow keeps metadata and data as parallel structures. The metadata describes the shape of your business; the data fills it in.

Schemas group models on the metadata side, just as tenants group instances on the data side. Each instance follows the shape of a model — and that shape can change at runtime without breaking what already exists.

Core concepts

  • Schemas — Logical groupings of models — a database schema, or a feature area within the metadata layer.
  • Models — Blueprints for your data — fields, types, validations and relations.
  • Tenants — Isolated containers for an organization's data — one per customer, environment or workspace.
  • Instances — Concrete records that follow a model's shape — the actual rows inside a tenant.

Why metadata-driven?

Traditional apps require a code change, build and deploy cycle every time the data structure evolves. Yellow separates structure from logic — the UI adapts on its own.

Three things this unlocks

  • Define a new model in minutes with no code.
  • Add fields, change validations and create relations — all at runtime.
  • Tenants and their instances adopt the new shape automatically.

Getting started

  1. Sign in with your account.
  2. Select your organization and tenant.
  3. Browse schemas from the left sidebar.
  4. Click a model to view its instances.
  5. Use the + button to create new instances.

See First login for a detailed walkthrough.