Pricing

Apache 2.0 open-source protocol and implementations; no commercial product pricing on the official site.

Overview

A2UI is an open protocol that lets ai agents send rich, interactive user interfaces as declarative JSON instead of executable code. Clients render approved components with their own native widgets on web, mobile, or desktop. The project includes specs, renderers for Angular, Flutter, Lit, and others, plus transports such as A2A. Google started it with community contributions; versions range from legacy v0.8 to a v1.0 candidate.

Key features

Declarative component catalogs instead of code execution
Streaming JSON for progressive UI updates
Framework-agnostic client renderers
Client-to-server actions and action responses
Custom catalogs for charts, maps, and domain widgets
Composer and theater demos for authoring and playback
Apache 2.0 specification and implementations

Use cases

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Interactive agent demos

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