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assistant-ui

Composable AI-chat primitives and runtime adapters for threads, streaming messages, tool calls and custom agent interfaces, with React web, native and terminal packages.

ReactReact NativeInk
Visit library ↗ GitHub repository ↗

Working with this library

Verified 2026-10-02 from official README, MIT license and pricing page. Install @assistant-ui/react and the backend adapter, or use the CLI to copy styled components. AI SDK and LangGraph adapters are documented; React Native and Ink are separate platform packages, not automatic portability of every web component. The MIT library is free; Assistant Cloud is optional. Cloud Free includes 200 MAU; Pro displays $50/month for 500 MAU and $0.10 per additional MAU, but an ISO currency was not confirmed, so numeric paid pricing is intentionally omitted. Enterprise is custom; consumer/B2C pricing requires contact. Tax treatment and commitments were not confirmed. Editorial: useful for agent products that need more control than a monolithic chat widget; integration still requires a backend and deliberate persistence/tool authorization. No independent accessibility certification was performed.

Pricing

MIT library

Free

Assistant Cloud Free

Free

Optional hosted service; 200 MAU.

Assistant Cloud Enterprise

Contact for pricing

Optional backend; custom MAU pricing. Contact for B2C pricing.

Last checked Oct 2, 2026. Prices and licensing may change.

Check current pricing and terms ↗

Landing page preview

Landing page of assistant-ui

Captured Oct 2, 2026. This is a visual reference; check the library's license before using its components.

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