Compare the top Shopify CRO agency options for 2027: A/B testing specialists and Shopify Plus partners with published test results, named clients and pricing.
Most Shopify brands reach a point where buying more traffic stops paying for itself. Paid social costs rise, organic growth levels off, and the quickest remaining lever is the share of existing visitors who actually buy. That is the job of a Shopify CRO agency: find out why shoppers leave, test changes to product pages, collections, carts and offers, and keep only the changes that measurably lift revenue per visitor.
The gap between strong and weak options in this market is wide. Plenty of Shopify build agencies now list “CRO” as a service, but on inspection it often means a one-off audit or a redesign with no controlled testing. The agencies worth hiring run structured experiments on a real testing platform, report against revenue rather than vanity metrics, have people who can write Liquid and theme code as well as design variants, and publish results you can check. Shopify conversion rate optimisation done properly looks more like a lab than a design studio.
To build this list we reviewed CRO specialists and Shopify agencies across the UK, the US and Europe, and checked each one against its own website and, where available, the Shopify Partner Directory. We favoured agencies with a dedicated Shopify CRO service, a documented A/B testing process, named Shopify clients and published test results. We screened out generalist CRO consultancies with no Shopify evidence and build agencies whose CRO offer was not backed by testing. Every company below was live and trading under its own name at the time of writing.
Shopify CRO Agencies At A Glance
Company
Based In
Best For
Known For
Blend Commerce
UK and Australia (remote team)
Growing DTC brands wanting audit, testing and build under one roof
Global CRO Agency of the Year 2026, public A/B test library
craftberry
Varna, Bulgaria
Shopify Plus brands with $2M+ revenue wanting a guaranteed testing programme
Shopify Premier Partner, 60% test win rate, Intelligems testing
Prismfly
Dallas and New York, USA
US DTC brands wanting CRO, retention and development together
UK DTC brands wanting CRO-led rebuilds and ongoing testing
Shopify Premier Partner, BetterYou and Sofa Club results
Growth Rock
San Jose, USA
Established ecommerce brands with $10M+ revenue
A/B testing since 2013, live test database
CONVERTIBLES
New York, USA and Sofia, Bulgaria
Shopify Plus brands wanting high test velocity
Intelligems partner, 36 published test case studies
Avex Designs
New York, USA
Fashion and lifestyle brands focused on personalisation
Growth X programme, Dynamic Yield Partner Excellence Award
GoGoChimp
Glasgow, UK
Smaller UK stores wanting fixed-price CRO
Shopify CRO since 2013, published monthly pricing
Best Shopify CRO Agencies For 2027
1. Blend Commerce — Shopify-Only CRO Specialist With A Public Test Library
Blend Commerce was founded in 2017 by Adam Pearce and Peter Gardner and began life as one of the early UK agencies specialising in Shopify development before narrowing its focus to conversion work. The team now works remotely across the UK and Australia and serves Shopify brands in the US, Canada, the UK, Europe, the Middle East and Australia. In 2026 it was named Global CRO Agency of the Year at the Global Agency Awards.
The service is split into clear stages. CRO Insights covers audits, behaviour analysis, heuristic reviews and a prioritised roadmap. CRO Implementation handles strategy, UI and UX design, development and ongoing A/B testing, using tools such as Intelligems, Microsoft Clarity and GA4. A separate CRO Redesign service rebuilds storefronts on the back of user research. Blend also publishes a public library of past tests, which is a useful way to judge its thinking before you speak to anyone.
Published results are specific. Blend reports average gains after twelve months of 70% in revenue and 37% in average order value, a 177% year-on-year conversion increase for Six Brothers Beef, and a USA Containers test that lifted revenue per visitor by 25%. Named clients include Strivectin, Aquarium Co-op, Stone Creek Coffee and Wilson’s Pet Food. It suits growing DTC brands that want research, testing and build delivered by one Shopify-only team.
2. craftberry — Shopify Premier Partner With A Guaranteed Testing Programme
craftberry is headquartered in Varna, Bulgaria and holds Shopify Premier Partner status. It builds and migrates Shopify stores, but its Shopify A/B testing service is a standalone offer with its own research tool, Signalveritas, which pulls together up to eight data sources per store. Tests are built in-house on Intelligems, with Microsoft Clarity, Hotjar and Mouseflow for behaviour data and GA4 cross-checks on every result.
The commercial model is unusually clear. Retainers are built around three to five tests a month, each run for at least two full business cycles, with revenue per visitor as the main metric. Before the first test, craftberry agrees a baseline and a target lift, typically 10%; if that lift is not reached within 90 days, testing continues without a retainer fee until it is. The agency publishes its programme numbers: 50 concluded tests, 30 winners and a 60% win rate, with winning tests spread across collections, product pages, navigation, homepages and carts.
Named clients include On, Glowforge, Josera, Honest and Shelly, where a testing programme lifted revenue per visitor by 25%. The service is aimed at Shopify and Shopify Plus brands with at least $2M in annual revenue and 1,000 orders a month, so smaller stores are pointed towards an audit first.
3. Prismfly — CRO-First Shopify Plus Partner For US DTC Brands
Prismfly was founded in October 2020 by brothers Yaseen and Yusuf Shurbaji and runs offices in Dallas and New York. It was set up specifically to grow revenue through conversion work, and in December 2021 became the first CRO-focused Certified Shopify Plus Partner. Its service covers customer research (usability testing, surveys and session recordings), experimentation including A/B testing and personalisation, plus Shopify Plus development, migrations and email retention.
The client roster is strong for a young agency: Dr. Squatch, Primal Kitchen, Princess Polly, Crunchlabs, Lashify and Kaged Fitness all appear on its site. Its case studies report a 33% revenue increase for Primal Kitchen, a 22% lift in completed checkouts and 36% more add-to-carts for Archer & Olive, a 52% conversion lift for DFTBA and a 78.6% purchase test win rate for Mood. Clients get weekly status calls, a shared Slack channel and written experiment reports.
As a Shopify Plus CRO agency, Prismfly suits US DTC brands that want one partner to handle testing, theme development and retention flows, rather than coordinating a separate CRO consultancy and build agency.
4. ABxpert — Shopify Platinum Partner Focused On DACH Brands
ABxpert describes itself as the only CRO-specialised Shopify Plus agency in Germany. The Shopify Partner Directory lists it as a Platinum Partner based in Steinhagen with a team of around 20, offering conversion optimisation alongside store builds, migrations and theme work. On its own site it reports more than 2,500 completed A/B tests, over 250 optimised shops and more than 300,000 analysed sessions.
The process is thorough. Research draws on recordings, heatmaps, surveys, product reviews, social comments and support tickets. Hypotheses are prioritised, designed, coded through GitHub and pass two internal QA stages before going live, and every test is documented after evaluation. GA4 tracking is cleaned up as part of onboarding. Featured work in the Shopify directory includes an A/B testing programme for Elekjackgun that the agency says added over €300K in annual revenue within twelve weeks, and a Shopify Plus relaunch for FITTASTE that raised desktop conversion by 101%.
Clients include Tom Tailor, Dermalogica, Smilodox, Plantura and Judith Williams. ABxpert is the natural pick for German, Austrian and Swiss brands that want German-speaking strategists and a high-volume testing programme.
5. That Works Agency — UK Shopify Premier Partner Built Around Post-Click CRO
That Works Agency is a Shopify Premier Partner with a distributed team of around 40 people. Its stated focus is post-click conversion rate optimisation, and its services are packaged around that: a CRO Growth Retainer covering ongoing testing, ad-matched landing pages and day-to-day store work, and CRO Theme Builds and Migrations for brands that need a new store designed around how their customers actually buy. The team uses its own Atlas AI tools to support research and test production.
Its case studies come mostly from UK DTC brands. BetterYou saw revenue rise 70% and conversion rise 51% after a full rebuild, Eleat doubled revenue and lifted conversion by 58% without extra traffic, Sofa Club scaled from £20M to £80M, and Dryrobe recorded a 49x return in its first six months. Other clients named on the site include Spacegoods, UpCircle, Hairburst and Nuvé.
That Works is a good fit for UK brands spending heavily on paid social that want landing pages and on-site testing tied closely to their ad creative, or for brands whose current theme is holding back any testing at all.
6. Growth Rock — Long-Running A/B Testing Specialist For Larger Ecommerce Brands
Growth Rock was founded in 2013 by Devesh Khanal and is based in San Jose, California. Its main service is conversion optimisation through A/B testing for ecommerce brands with $10M or more in annual revenue. Since 2018 it has also run a dedicated Shopify and Shopify Plus development team that works only with Shopify brands, which means winning tests can be built properly into the theme rather than left running in a testing tool.
The research process combines analytics, user recordings and qualitative feedback, and tests are organised under the agency’s own Purpose Framework. Growth Rock also maintains a live database of A/B tests, updated monthly, which gives prospective clients a clear view of what it has tried and learned. Its published case studies cover sticky add-to-cart buttons, mobile navigation, free shipping thresholds and pricing displays, including a copywriting test that lifted product page conversion by 13.9% and two upsell tests valued at over $2M a year in revenue.
Named clients include Amerisleep, Kettle & Fire, Perfect Keto, Swimsuits for All and Edible Arrangements. Growth Rock suits established brands that already have meaningful traffic and want a disciplined testing partner with more than a decade of history.
7. CONVERTIBLES — High-Velocity Shopify A/B Testing For Shopify Plus Brands
CONVERTIBLES operates from New York and Sofia and works with Shopify Plus brands doing more than $2M a year. It is an official Intelligems partner and also runs its own testing tool, TestBuddy. Its Shopify A/B testing programme runs two to four multi-variation experiments a month across offers, product pages, collections, carts, checkout, hero sections and pop-ups, and the same team ships winning variants into the live theme.
The agency publishes its test outcomes in detail: 36 case studies with around $2.3M a month in combined measured lift, a product page social proof retest that raised conversion by 15.56%, a sticky homepage CTA that added 20.4%, and a cart drawer free-gift progress bar worth about $50K a month. Named clients include Jones Road Beauty, Performance Golf and Gymreapers, and it also offers Shopify CRO for subscription brands, landing pages and speed work.
CONVERTIBLES suits brands that already understand testing and want a team that can run more experiments each month without the internal development bottleneck.
8. Avex Designs — Shopify Plus Agency Pairing Testing With Personalisation
Avex Designs is a New York agency that describes itself as a Platinum Shopify Plus agency. Its CRO offer, Growth X, is built for Shopify and Shopify Plus brands and combines quarterly benchmarking, monthly analytics reviews, A/B testing, personalisation and a managed design and development retainer. Avex works with Dynamic Yield, Nosto, LimeSpot and Omniconvert, and won a Dynamic Yield Partner Excellence Award for onboarding the most new clients to that platform.
Published results lean towards personalisation. For Vitality, a recommendation tool and ongoing testing that treated new and returning customers differently produced a 20% increase in purchases and an 11% lift in average order value among engaged users. For ALASTIN, product recommendations accounted for 13.7% of revenue over 30 days. Avex’s wider client list includes quip, FILA, TYR, KHAITE, Equinox and Brandon Blackwood.
Avex suits fashion, beauty and lifestyle brands with large catalogues, where tailored recommendations and segment-level testing are likely to matter as much as layout changes.
9. GoGoChimp — Fixed-Price Shopify CRO For Smaller UK Stores
GoGoChimp is a Glasgow agency that has offered Shopify CRO since 2013 and displays a Shopify Partner badge. Founder Chris McCarron leads the work, and the agency serves clients in the UK, Europe and the US. Shopify and WooCommerce are its most common platforms. Services cover structured A/B testing on Shopify and Shopify Plus storefronts, copy and headline testing, layout and CTA redesign, checkout and form optimisation, mobile experience work and page speed fixes.
What sets it apart for smaller brands is transparent pricing: a two-week Sprint at £2,500, a Growth plan at £2,500 a month on a three-month minimum, and a Scale plan at £5,000 a month that comes with a performance guarantee. Case studies on its site include Super Area Rugs, which the agency reports grew revenue by 216%, and Helix Binders, where monthly revenue roughly tripled. Some figures on its pages are presented inconsistently, so ask for the underlying test reports during scoping.
GoGoChimp is a sensible starting point for UK stores below the revenue thresholds the larger specialists require, or for brands that want to trial CRO on a fixed budget before committing to a long retainer.
How To Choose A Shopify CRO Agency
Do they run controlled A/B tests or only make recommendations?
Ask exactly how changes are validated. A genuine programme splits traffic between a control and a variant on a testing platform such as Intelligems, Convert or VWO, runs each test for at least one or two full weekly cycles, and only ships a change when the result is statistically sound. If the agency talks mainly about audits, best practice and redesigns, you are buying opinions rather than evidence. Ask to see a sample test report with the hypothesis, traffic split, run time and result.
Is your store big enough for testing yet?
Testing needs volume. Several agencies on this list set minimums of around $2M in annual revenue or 1,000 orders a month, and Growth Rock looks for $10M or more. Below those levels, tests take too long to reach a clear answer. If you are smaller, an audit, a fixed-price sprint or a CRO-led theme rebuild is usually better value than a monthly testing retainer. A good agency will tell you this rather than sell you a programme you cannot use.
Can they build on Shopify themselves?
Shopify CRO services often stall at the hand-off between strategist and developer. Check that the agency has in-house Liquid and theme developers who can build test variants properly and then ship winners into the live theme. Ask how they handle Shopify Plus checkout extensibility, apps such as Rebuy or Recharge, and Shopify Markets if you sell internationally. Agencies that also hold Shopify Partner status, such as craftberry, Prismfly, ABxpert and That Works, tend to be stronger here.
Which metric will they report against?
Conversion rate alone can mislead: discounting harder will lift it while cutting margin. Ask whether the agency reports on revenue per visitor, average order value or profit per visitor, and how it separates test results from seasonal swings and paid media changes. The better agencies agree a baseline at the start and show cumulative impact over time, not just a list of winning tests.
How much research comes before the first test?
Strong programmes start with evidence: analytics clean-up, session recordings, heatmaps, on-site surveys, customer reviews and support tickets. That research produces a ranked backlog of test ideas. Be cautious of an agency that proposes a test list in the first call without looking at your data, and equally of one that spends three months researching before launching anything. Two to four weeks of research before the first test is a reasonable benchmark.
What does the contract and pricing look like?
Monthly fees vary widely, from fixed sprints of a few thousand pounds to retainers well into five figures. Ask what is included each month (number of tests, design and development hours, reporting), the minimum term, and what happens if results do not arrive. Some agencies on this list offer guarantees tied to revenue per visitor or performance-based pricing. Read the conditions carefully, as they usually depend on stable traffic and on you shipping winning changes promptly.
Conclusion
The right Shopify CRO agency depends mainly on your traffic, your market and how much of the build work you want handed over. Blend Commerce and craftberry offer the most complete Shopify-only testing programmes on this list, Prismfly and That Works combine CRO with Shopify Plus partner-level development, ABxpert is the clear choice in the DACH region, and Growth Rock, CONVERTIBLES and Avex Designs suit larger brands with specific testing or personalisation needs. For smaller UK stores, GoGoChimp’s fixed pricing is a low-risk way in.
Whichever ecommerce CRO agency you shortlist, ask for real test reports, confirm who builds the variants, and agree the reporting metric before you sign. If you would prefer a local partner, our list of the Top CRO Agencies In Manchester covers agencies in the North West, and if your store needs a redesign before testing can begin, see our guide to the Top Shopify Web Design Agencies.
