Persona.js
JavaScript library for adding AI agent chat UIs to any web app — floating, docked, or fullscreen
| What is it | JavaScript library for adding AI agent chat UIs to any web app — floating, docked, or fullscreen |
|---|---|
| Pricing | Free |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Best for | adding AI chat to a web application, building an AI assistant UI |
| Domain registered | 2026 |
Data updated Aug. 1, 2026
What does Persona.js do?
Persona is a JavaScript library that lets you drop an AI agent chat interface into any web app. You can choose between a floating launcher, a docked sidebar, or a fullscreen assistant. It works with any backend that supports Server-Sent Events (SSE), and it's built to be lightweight and framework-agnostic.
What makes Persona stand out is its WebMCP support. WebMCP is a browser standard that lets your page register tools (like search, cart, or booking functions) that the AI agent can discover and use, with user approval. The library uses Shadow DOM to keep its styles separate from your app's, so no CSS leaks. It also has a three-layer theming system (palette, semantic, component) with dark mode and a live theme editor. You can customize the look to match your brand without forking the widget.
Persona is ideal for developers building AI-powered features into their websites. Whether you're adding a customer support chatbot, an AI copilot for a SaaS product, or an onboarding assistant, Persona gives you a solid starting point. The library is open-source and comes with pre-built examples for frameworks like Next.js, SvelteKit, Hono, and Express.
Key features
What makes it stand outWho is Persona.js for?
Who benefits most from this toolTrust & presence
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