Shopify CRO and growth agency
By Tom Carew and Tom Mucklow-Norell · Published 19 October 2026
We help Shopify and Shopify Plus brands grow after launch through conversion testing, SEO, email and ongoing development, planned month by month on a growth retainer.
The short answer
- Launch is the start, not the end. Most of a store's gains come from steady improvement afterwards.
- Good CRO starts with research: analytics, customer feedback and session data, then tests ranked by likely effect and effort.
- Fix the foundations first. Tests on a slow or unstable store give unreliable results.
What a growth retainer covers
| Area | What we do | Example |
|---|---|---|
| Conversion testing | A/B tests across the funnel, from hero messaging to product pages | London Nootropics |
| SEO | Technical fixes, metadata, internal links and content | Milamend |
| Email and CRM | Klaviyo flows, campaigns and segmentation | Little Saints, Fold Reformer |
| Retention | Subscription and cancellation analysis | Ursa Major |
| Development | New features, sections and fixes each month | Tileflair, Puresport, Guinness World Records |
- 321%
- More ranking keywords for Milamend within three months
- +68%
- Organic click-through rate for Milamend in the same period
- 32%
- More active subscribers for Ursa Major in six months
- 50% to 150%
- Uplift in Little Saints' email nurture performance within weeks
How we choose what to test
- Audit. Analytics, speed, code and the customer journey.
- Research. Customer feedback, reviews and session recordings.
- Prioritise. Ideas ranked by likely effect and effort. Low cost, high return comes first, as it did for Ursa Major.
- Test and ship. A/B tests where traffic allows; careful releases where it does not.
- Report. Monthly results and the next set of tests.
Red flags in a CRO agency
- Tests start before anyone has looked at the data.
- Every result is a win, with no losing tests reported.
- Tests run on too little traffic to mean anything.
- Nobody fixes the speed or stability problems that skew results.
Questions to ask a CRO agency
- How will you decide what to test first?
- How much traffic does a test need before we trust the result?
- Will you show us the tests that lost as well as those that won?
- Who builds the winning changes into the store?
- How do SEO, email and CRO work together in your plan?
‘Superco helped us prioritise the one thing that was going to drive the most revenue.’
FAQs
What is the difference between CRO and a growth retainer?
CRO is one part of it. Our growth retainer combines conversion testing with SEO, email, retention and ongoing development, planned together each month.
Do we need a lot of traffic for CRO?
A/B tests need enough traffic to give reliable results. With less traffic we focus on research-led changes, speed and SEO, and measure before and after.
Can you work on a store another agency built?
Yes. We start with a technical audit and fix what would skew results before testing.
Keep reading
Book a technical audit
We review your store's code, apps, speed, SEO and integrations, and tell you what to fix first. Or tell us about your project and we will tell you how we would approach it.
