Live demo - AI assistant for a website

An assistant that answers your visitors' questions from your own content

This is a working chat assistant for a fictional physiotherapy clinic, Northwind Physio in Lisbon. It answers only from the clinic's knowledge base (services, prices, opening hours, insurance, cancellation policy), replies in the visitor's language, refuses off-topic and medical questions politely, and points people to the booking form or phone for appointments. The API key lives on the server, never in the browser.

Try it

Click a question, or open the chat button at the bottom right and type your own.

What is included

• Embeddable widget: one <script> tag, no dependencies, 16 KB, streaming replies, clickable links and phone numbers, Stop button, full-screen on phones, keyboard and screen-reader accessible.
• Server function (Cloudflare Pages) that works with Claude, OpenAI or Gemini by changing one secret.
• Knowledge base in a plain Markdown file you can edit yourself.
• Guardrails: on-topic only, no diagnoses, no automatic bookings, short answers, visitor's language.
• Protection: message and history limits, same-origin CORS, per-visitor and global daily rate limits.

Embed it on any site

<script src="https://your-site.com/widget.js"
        data-endpoint="/api/chat"
        data-title="Ask Northwind Physio"
        data-color="#0f6e56"></script>

This demo runs on Gemini Flash Lite to keep hosting costs near zero; it works identically with Claude or OpenAI - only the API key and the model name change.