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About

Built by the founders of Growth Division.

The growth agency behind 130+ startups and scale-ups. GREX turns six years of what worked into systems your team can run.

Our story

From agency playbooks to an operating system.

  1. Growth Division

    We ran growth for 130+ startups and scale-ups.

    Six years running paid, outbound, SEO, content and lifecycle for teams like Weavr, Stability AI and Tutorful taught us what moves the number in each channel.

  2. Productising

    We turned what worked into systems.

    We wrote down how we run each channel: the steps, tools, checks and the metric it moves. There are nearly 40 systems today.

  3. GrowthEx

    We tested it as software.

    Our first product trained AI on 1,300+ winning growth experiments to suggest what to test next. Customers said: don’t just tell us, run it for us.

  4. GREX

    So we built the operating system to run it.

    Agents do the work, specialists stay in the loop, and every activity is tested against your North Star.

  • Systems beat heroics

    Growth that depends on one great marketer stalls. Systems keep running.

  • Output isn’t growth

    More content means nothing on its own. Every activity earns its place against a metric.

  • Experts stay in the loop

    AI does the volume. People who’ve run the channel decide what good looks like.

Founders

The people building GREX.

  • Tom Dewhurst

    Tom Dewhurst

    Co-founder

    Co-founded Ordoo, a mobile ordering app, scaled it to 30k+ users and sold it in 2019. Then co-founded Growth Division, which has driven £100m+ for clients.

  • Tristan Gillen

    Tristan Gillen

    Co-founder

    Tom’s co-founder for 10+ years, from Ordoo to Growth Division, where he has built GTM strategies for 130+ companies including Weavr, Stability AI and Tutorful.

  • Alex Robinson

    Alex Robinson

    CTO

    Marketing technologist with deep ML and AI expertise. Founder of five startups, including a robotic handwriting company (exit in 2022) and an AI video creator.

GREX grew out of Growth Division. Its specialists still build and review every system in GREX.

growth-division.com
130+
startups and scale-ups
£100m+
driven for clients
4.7
on Clutch, from 31 reviews

Company

GREX AI is a product of GrowthEx Ltd, registered in England and Wales, company number 16090644. Registered office: Future Business Centre Cambridge Campus, Kings Hedges Road, Cambridge, CB4 2HY.

Contacthello@grex.ai

Next launch: Week of 3 Nov 2026 · 1 slot left

See what GREX would build for you.

In 30 minutes we find where your go-to-market is leaking and map the first system we’d launch. You leave with a plan whether or not you work with us.

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