Measurement-first startup growth partner

Every marketing spend tracked to revenue.
Not traffic. Not leads

We build clean measurement infrastructure, then run the growth engine on top of it. In that order. Always.

Book a free measurement audit →

No retainer lock-in. Cancel any time.

Currently taking on 3 new clients this month
11+
Startups grown worldwide
−41%
Avg. CAC reduction
3.2x
Avg. pipeline growth
90d
Typical impact window
Across our clients →
Trusted by ambitious startups
The thesis

Measurement first.
Growth second.
Always in that order.

Most growth agencies optimise vanity. Clicks, impressions, cost-per-lead. The metrics that are easy to measure — not the ones that drives revenue.

We do it backwards. Before we touch an ad account, we wire server-side conversion tracking, build the data warehouse, and run attribution models against your actual sales data — not your ad platform’s reported numbers. Then, and only then, we scale spend. Everything we build belongs to you. The BigQuery schema, GA4 configuration, Looker Studio templates — yours on day one. If we stopped working together tomorrow, your team could keep it running without us.

Every marketing spend is tracked to revenue. Not traffic. Not leads. Revenue.

How we work

A three-phase engagement. Measurement, then infrastructure, then scale.

01 Weeks 1–2

Measurement audit

Two weeks. We pull every conversion event, every pixel, and all the warehouse tables you’re running. You get a breakdown: what’s tracked accurately, what’s inferred, what’s missing entirely.

02 Weeks 3–6

Infrastructure build

Server-side tracking. Identity resolution. Attribution model on your actual funnel. Dashboards that show revenue, not vanity.

03 Month 2+

Growth engine

Now we scale spend — with a clean feedback loop. Weekly reviews, monthly reforecasts, quarterly reality checks.

Client results

When tracking is clean, the numbers stop guessing.

View all case studies →
Saas
How Mowsix Grew Tasklo’s MRR From £9k to £20k Without Increasing Ad Spend

Tasklo had the traffic. What it did not have was a trial that converted: 0.8% of signups became customers. We fixed the measurement first, then the funnel.

£20k
Monthly recurring revenue (from £9k)
−38%
Blended CAC
The problem

Tasklo sells project management software to remote-first startups. Traffic was healthy. Trial conversion sat at 0.8%. Paid was profitable, so the obvious move was to spend more. They had already tried that. Spend went up and MRR stayed flat. Budget was never the constraint. Nobody at Tasklo could say which channels produced revenue, so every decision about where to put the next pound was a guess dressed up as a strategy.

The outcome

Tasklo had the traffic. What it did not have was a trial that converted: 0.8% of signups became customers. We fixed the measurement first, then the funnel.

View case study →
Fintech
How Mowsix Reduced Kredify’s CAC by 62% With Same Spend

Kredify was spending ₦1M a month on Meta with no way to prove any of it was working. Ten weeks later it had a verified 4.1× ROAS and a blended CAC less than half what it started with.

4.1×
Verified ROAS
−62%
Cost per verified sign-up
The problem

Kredify was spending ₦1M every month on Meta ads. Three systems tracked the results — the ads dashboard, the CRM, and the finance team's own records — and all three reported different sign-up numbers. Nobody could agree on what a sign-up was, so nobody could say whether the spend was working. The agency kept optimising toward form submissions. Most of them never became verified customers.

The outcome

Kredify was spending ₦1M a month on Meta with no way to prove any of it was working. Ten weeks later it had a verified 4.1× ROAS and a blended CAC less than half what it started with.

View case study →
Free PDF · Used by 11+ founders

What's broken in your growth setup?

30 specific checks across tracking, paid, retention and reporting. Find the gaps before you scale spend.

Get the checklist →
Inside the PDF
  • 1.1 Server-side conversion tracking
  • 2.1 Attribution model documented
  • 3.3 Landing page passes 5-second test
  • 4.1 Activation event defined
  • 5.2 Net Revenue Retention measured
30 checks · 6 categories · 9-page A4 PDF
Who we are

Built by founders who've sat where you sit.

Mowsix is an independent growth partner working with ambitious startups across the UK and Nigeria. We are senior-led — every engagement is run by people who have built and scaled businesses, not pyramid-managed by junior account staff.

Our model is simple: clean measurement, honest reporting, and real revenue impact. No retainer lock-ins, no percentage of ad spend, no fluff.

Meet the team →
Free tool

How sustainable is your startup's growth?

Enter your unit economics. Get a Sustainability Score, your CAC payback period, and the three changes that would move them most. 90 seconds.

Try the calculator →
Sample result
64/100
Watch your back
LTV : CAC2.4 : 1
CAC Payback9.2 mo
What founders say

"We thought we knew our funnel."

"The audit Mowsix ran in week one surfaced issues our previous agency had missed for 18 months. The results since working with them is exceptional"

Amaka N.
Amaka N.
Head of Growth, Kredify

"Most agencies tell you what you want to hear. Mowsix told us our conversion rate problem was actually an onboarding problem. They were right. MRR doubled in 6 months"

Sarah K.
Sarah K.
Co-founder, Saas Startup

"We went from 4 organic landlord leads a month to 31 in 6 months. They built us a content and SEO engine we now own entirely. No dependency on them to maintain it."

Dan M.
Dan M.
Founder, Vantage Lettings

"Before Mowsix, we were spending £3k a month on paid and genuinely couldn’t tell which channel was driving pipeline. Within 6 weeks they had our tracking completely overhauled and we cut our CAC by 38%. It changed how we make every marketing decision"

James O.
James O.
CEO, PropTrack Analytics

"The audit Mowsix ran in week one surfaced issues our previous agency had missed for 18 months. The results since working with them is exceptional"

Amaka N.
Amaka N.
Head of Growth, Kredify

"Most agencies tell you what you want to hear. Mowsix told us our conversion rate problem was actually an onboarding problem. They were right. MRR doubled in 6 months"

Sarah K.
Sarah K.
Co-founder, Saas Startup

"We went from 4 organic landlord leads a month to 31 in 6 months. They built us a content and SEO engine we now own entirely. No dependency on them to maintain it."

Dan M.
Dan M.
Founder, Vantage Lettings

"Before Mowsix, we were spending £3k a month on paid and genuinely couldn’t tell which channel was driving pipeline. Within 6 weeks they had our tracking completely overhauled and we cut our CAC by 38%. It changed how we make every marketing decision"

James O.
James O.
CEO, PropTrack Analytics

"The audit Mowsix ran in week one surfaced issues our previous agency had missed for 18 months. The results since working with them is exceptional"

Amaka N.
Amaka N.
Head of Growth, Kredify

"Most agencies tell you what you want to hear. Mowsix told us our conversion rate problem was actually an onboarding problem. They were right. MRR doubled in 6 months"

Sarah K.
Sarah K.
Co-founder, Saas Startup

"We went from 4 organic landlord leads a month to 31 in 6 months. They built us a content and SEO engine we now own entirely. No dependency on them to maintain it."

Dan M.
Dan M.
Founder, Vantage Lettings

"Before Mowsix, we were spending £3k a month on paid and genuinely couldn’t tell which channel was driving pipeline. Within 6 weeks they had our tracking completely overhauled and we cut our CAC by 38%. It changed how we make every marketing decision"

James O.
James O.
CEO, PropTrack Analytics
Rated by founders on Google ★ ★ ★ ★ ★ ★ ★ ★ ★ ★ 4.0 (1 reviews) Google
Frequently asked

Questions we get on the call.

Why Mowsix?
+

Most agencies sell campaigns. We sell measurement infrastructure that survives the engagement. Every system, dashboard, and process belongs to you when we're done. No black-box reporting, no dependency on us to maintain it.

Do you work with early-stage startups?
+

Yes — but with a caveat. If you haven't nailed your ICP or established product-market fit, we'll tell you to fix that first. Marketing investment before PMF burns money. We'd rather lose the engagement than help you waste it.

How is Mowsix different from a generalist digital marketing agency?
+

Generalists optimise for vanity metrics — clicks, impressions, engagement. We optimise for revenue. Before we touch your ad accounts, we wire your tracking, build your attribution model, and connect spend to pipeline. Then we scale.

How do you measure success?
+

Revenue you can forecast. CAC trending down. Pipeline tied to specific channels. Whichever metric matters most to your board, we make it visible — then move it. We don't measure success in agency-deliverables.

Who does Mowsix serve?
+

Senior-led startups across the UK and Nigeria — primarily SaaS, fintech, real estate, and ecommerce. Most of our clients are founder-led with at least one product market fit signal, and serious about growing measurably rather than fast.

How long is a typical engagement?
+

Three to six months. Two-week audit, four-week infrastructure build, then a rolling growth retainer. We don't lock you in — 30 days notice after month three.

What stage of startup do you work with?
+

All stages — but the model fits best post-PMF. You need a real product, a defined ICP, and at least the runway to invest in growth. Below that, an audit alone still pays for itself.

Do you manage ad accounts directly?
+

Yes — but only after the measurement layer is live. We won't run spend against a broken tracking stack. That's non-negotiable.

Which channels do you cover?
+

Paid search, paid social, programmatic, SEO/GEO and lifecycle. We partner with influencer when it makes sense.

How is pricing structured?
+

Flat monthly fee for the growth engagement, sized to your spend. No performance fees — they misalign incentives.

Stop guessing. Start measuring.

30-minute audit call. We diagnose your tracking, attribution, and the gap between spend and pipeline. No pitch.

Book your free audit ↗