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// Case study 07 / 08 · concept project

AI-DuoAI agency, Poland

A conversation instead of an offer: companies hear how their assistant would sound.

Concept project — how I would build a website for a business in this field: AI agency. The business and its details are fictional.

AI-Duo website on desktop — screenshot of the live site
Field
AI agency
City
Poland
Languages
PL / EN
Type
concept project
Year
2026
Address
See it live ↗ (ai-duo.sitebest.eu)

01 — Problem

A company considering an AI assistant will not buy it from a description — it has to hear how it sounds. This is how I would build an AI agency site: instead of an offer, samples you can listen to, click and watch.

02 — Decisions

  1. A script for two voices

    Headings are pairs of lines: YOU in vermilion Instrument Serif italics, DUO in turquoise monospace.

  2. A call you can listen to

    A recorded call with the voice assistant (40 s in Polish, 33 s in English) with word-timed captions and a full transcript that works without JavaScript.

  3. Chat with no API costs

    A click-through chat with a fixed question tree instead of a language model: no per-request fees, and without JavaScript it works as a plain disclosure list.

  4. An avatar that introduces itself

    The video starts only on click, and DUO says straight away that it is AI. Video is served through a Worker with Range support — without it, it would not play on iPhones.

  5. All AI, all labelled

    Images from Google Flow, voices from Gemini TTS, the avatar from Flow — the footer and captions say so plainly.

03 — Result

A site in Polish and English with 12 sample scenarios (voice, chat, avatar). Mobile layout shift fell from 0.18–0.27 to 0.00–0.03 after preloading fonts. Performance 99 on mobile, 100 on desktop.

Lighthouse · performance

99phone

100desktop

measured:

04 — DNA card

What the finish is made of

Click a token to strip it from the preview. What remains is the bare structure — the same one every website of mine stands on.

Colours

Heading typeface

Corner radius

05 — Google sees

What this website tells search engines and AI

  • Services right in the title: “voice agents, chatbots and AI avatars for businesses”.
  • The call transcript as HTML text — search engines and AI can read what the recording says.
  • hreflang pl/en with x-default, canonicals and Open Graph.
  • sitemap.xml with 36 addresses in two languages.
  • The fictional agency demo is noindex (meta and X-Robots-Tag).

06 — On a phone

The same website, 390 pixels wide

390 × 844 screenshot of the live website. Mobile performance score:

99/ 100

AI-Duo website on a phone — screenshot of the live site
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