Weekly
Your GTM engineer
Runs your GTM call, reviews outputs and tunes systems against your North Star.
Tristan Gillen or Tom Dewhurst
How we work
We build it with you, then run it with you.
Expert-built growth systems, the people to run them with you, and a workspace you own. Here’s what happens after you book.
Four steps
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Strategy session
We learn your business, targets and stack, then show you the first system we’d launch.
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GTM Gap audit
We scan your positioning, search, AI visibility, paid and outbound, and show you the gaps to fix first.
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System map
Which systems, in what order, against which metric. A written proposal with deliverables and price.
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14-day launch
We build your AI marketing brain and launch your first system. Then it runs weekly.
The 14-day launch
Your first system, live in 14 days.
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Day 1
Kickoff with your GTM engineer and our AI engineer.
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Days 1–3
Positioning and ICP interview; you connect your tools.
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Days 3–7
We build your AI marketing brain and draft your voice and messaging.
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Days 7–12
First system built; you review its outputs.
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Day 14
First system live. GREX training for your team.
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After launch
Weekly GTM call. New systems as you add them.
The launch checklist
Your side of the launch
From a real client launch, name removed. It’s short, and it’s what makes 14 days possible.
- 60-minute kickoff with your GTM engineer and our AI engineer.
- 60-minute positioning and ICP interview: goals, markets, buyers, the problems you solve, competitors.
- Approve the voice, brand guidelines and messaging we draft.
- Grant access to your CMS, Search Console and Google Analytics.
- Grant access to your CRM, or share your customer and pipeline data.
- Connect the LinkedIn profiles and company page you’ll use.
- Provide or approve a sending domain and mailboxes for outreach.
- Share your decks, product docs, pricing, case studies and testimonials.
- Name one person to approve content and outreach.
- Review each system’s first drafts.
- Join a one-hour GREX training session.
Your launch fee comes back when we both deliver.
You complete the checklist; we get your first system live by day 14. Then your £3,000 launch fee comes back as £500 off each of your first six months. If we miss day 14 on our side, you get it back anyway.
The people
Who’s in the loop
Build and tuning
Our AI engineer
Builds and maintains your systems and integrations.
Alex Robinson
On any system you add
Channel experts
SEO, GEO, paid social, outbound and more, each tuning their own system.
Lorenzo, Lauren and more · +£500/month per system
What you own
It’s your stack.
GREX is a layer on your tools and data, not another tool to lock you in.
- Your systems and customisations
- Your knowledge base, playbooks and brand docs
- Your data and the full experiment log
- Your ad, analytics and CRM accounts stay in your name, on access you can revoke any time.
- If you leave, we export everything, and return or delete your data within 7 days.
Why not just use Claude?
AI agents work when you give them a system.
Claude on its own
Someone prompts Blank page No loop Nothing learned Generic output
- Runs when someone sits down to prompt it
- Starts from a blank page
- Generic output
- No way to see what worked
With GREX
Your context Systems run on a schedule Learns Results tracked You approve
- Runs on a schedule; you review and approve
- Starts from expert-built systems
- Specific to your business and voice
- Tracks every output against a target and learns
You could build this yourself. Most teams don’t, and what they build is stale in three months. GREX connects through MCP, so it works inside Claude today and isn’t tied to one model.
Your options
What it takes to get there another way
Agencies bring expertise. Software runs on its own. Neither does experimentation at scale. GREX does all three, you keep everything it builds, and it costs less than an agency (trust us, we used to run one).
| What you get |  | Growth agency | AI marketing platform | Claude + your team | In-house hire |
|---|---|---|---|---|---|
| Expert-built around your business | Yes: Channel experts, customised to you | Yes: Yes | Partly: Templates you configure | No: You start from a blank page | Partly: One person’s experience |
| Runs without someone prompting it | Yes: On a schedule; you approve | Yes: Their team runs it | Partly: Partly | No: Only when prompted | Partly: Only in their hours |
| Proves what’s working | Yes: Every activity traced to your North Star | Partly: Reports, rarely attributed | Partly: Channel metrics only | No: Nothing measured | Partly: Depends on the hire |
| You keep the systems and learning | Yes: In your workspace, exportable | No: Leaves with the agency | No: Locked in the tool | Partly: If someone writes it down | No: Leaves with the person |
| Time to first live system | Yes: 14 days | Partly: 4–8 weeks | Partly: Days, then you build it | No: Weeks of trial and error | No: 3–6 months to hire and ramp |
| Typical cost | From £3,000 a month | £3.5k–£17k a month | Licence plus your team’s time | Your team’s time | £50k+ salary, plus hiring |
Yes Partly No Typical UK costs: agency multi-channel retainers (Whito, 2026); growth marketing manager salary (PayScale, 2026).
Expert-built around your business
GREXYes: Channel experts, customised to you
- Growth agency
- Yes: Yes
- AI marketing platform
- Partly: Templates you configure
- Claude + your team
- No: You start from a blank page
- In-house hire
- Partly: One person’s experience
Runs without someone prompting it
GREXYes: On a schedule; you approve
- Growth agency
- Yes: Their team runs it
- AI marketing platform
- Partly: Partly
- Claude + your team
- No: Only when prompted
- In-house hire
- Partly: Only in their hours
Proves what’s working
GREXYes: Every activity traced to your North Star
- Growth agency
- Partly: Reports, rarely attributed
- AI marketing platform
- Partly: Channel metrics only
- Claude + your team
- No: Nothing measured
- In-house hire
- Partly: Depends on the hire
You keep the systems and learning
GREXYes: In your workspace, exportable
- Growth agency
- No: Leaves with the agency
- AI marketing platform
- No: Locked in the tool
- Claude + your team
- Partly: If someone writes it down
- In-house hire
- No: Leaves with the person
Time to first live system
GREXYes: 14 days
- Growth agency
- Partly: 4–8 weeks
- AI marketing platform
- Partly: Days, then you build it
- Claude + your team
- No: Weeks of trial and error
- In-house hire
- No: 3–6 months to hire and ramp
Typical cost
GREXFrom £3,000 a month
- Growth agency
- £3.5k–£17k a month
- AI marketing platform
- Licence plus your team’s time
- Claude + your team
- Your team’s time
- In-house hire
- £50k+ salary, plus hiring