Welcome, Crossword friend.
Let’s create unique AI experiences on WordPress.
Runtype tames the complexity of AI projects. For WordPress, that means working with native AI building blocks while connecting to the broader ecosystem of models and tools, so you can focus on what makes each client project unique.
Our open source library, persona.js, is purpose built to help do that on the frontend. Because it’s truly open, it can connect to any AI backend. You get over 6 months of product research into agentic experiences wrapped up in a tiny, powerful package that drops seamlessly into your website or plugin.
If that’s interesting to you, we should talk! We’re reserving time for our Crossword friends specifically. Booking link is below.
01 — Persona.js, our open-source agent UI library
Build unique UI for your AI products in pure JS.
02 — Time with the founders
A personal session to help you build and ship your AI product.
Persona: an AI chat widget that is completely yours.
Persona.js is our open-source chat UI. MIT licensed, written in vanilla TypeScript with zero framework dependencies. It works with any SSE-capable backend, themes to match your brand, and drops into any site with a single script tag. Yes, including WordPress.
Zero framework dependencies
Written in vanilla TypeScript. No React, Vue, or build step required. It runs anywhere a script tag does.
One script tag to install
Drop it into any site, WordPress theme or plugin. The installer paints a launcher in under 20 KB.
Works with any backend
Persona speaks plain SSE. Point it at Runtype, your own server, or any AI framework that streams.
Streaming, multi-modal & voice
Token streaming, images and PDFs, speech-to-text and text-to-speech, tool calls with approval gates.
Themeable & pluggable
Design tokens for full brand control, plus 14+ render hooks to customize the UI without forking.
Ready for WebMCP
Polyfills native WebMCP support, for more token efficient frontend experiences.
We’ll make the time to help.
If you’re a Crossword listener building something with AI, we want to help. Book a personal working session with the Runtype founders. No pitch, just a real conversation about what you’re building and how to ship it.
A handful of slots each month.
Runtype is where your frontier products run.
Persona provides the front door. The web experience. Runtype is built to power everything behind it: flows, agents, tools, models, and the managed infrastructure to deploy them. Open source where it counts, managed where it helps.