The best ecommerce CRO agencies are the ones that show you their real test results before you hire them.
For most online brands, start with Conversionwise (100 published tests in our archive), then Maison Commerce, Scaling CRO and Tailored Commerce.
Bigger DTC brands should also look at SplitBase and DRIP Agency.
If you want the most honest record of what wins and what doesn't, look at Clean Commit.
How we picked: we read each agency's own site and public case studies, and counted the ecommerce tests credited to it in the LiftArchive database.
We have not hired these agencies or audited their client work. Our own practitioners come first.
| Agency | Based in | Best for | Known for | Tests in our archive |
|---|---|---|---|---|
| Conversionwise | Bristol, UK | Brands that want testing plus Shopify builds | Revenue-per-visitor tests on carts, menus and PDPs | 100 |
| Maison Commerce | EU-based | Shopify brands doing €100k+/month | 4-6 tests a month, plus themes and PDPs | 30 |
| Scaling CRO | Not stated on site | Brands doing $1M+/month | Research-led roadmaps, landing pages, post-purchase | 7 |
| Tailored Commerce | Not stated on site | Smaller Shopify brands wanting no lock-in | Month-to-month testing and landing pages | 5 |
| Syntra Labs | Not stated on site | Brands that want tests on a subscription | Request-based A/B tests and Shopify dev | 162 |
| Blend Commerce | London, UK (registered office) | Shopify brands wanting a big public test library | Product page, menu and subscription tests | 150 |
| DRIP Agency | Traunstein, Germany | European shops from €100k/month | SNOCKS and KoRo test programs | 41 |
| Clean Commit | Fully remote | Stores with 30,000+ monthly sessions | Publishing every test, including losses | 173 |
| SplitBase | Montreal, Canada | $10M+ DTC brands | Offers, bundles and landing pages | 15 |
| Convertibles | Not stated on site | Shopify brands doing $2M+ | Cart drawer and sale-price tests | 46 |
| Conversion Fanatics | Not stated on site | Mid-size stores wanting a high test pace | Trust, button copy and cart tests | 38 |
| GrowthRock | San Jose, California | 7- to 9-figure stores | A public database of its own tests | 18 |
| Prismfly | Dallas, Texas | DTC brands wanting CRO plus dev and design | Princess Polly, Luxy Hair, CrunchLabs work | 10 |
| Surefoot | Not stated on site | Established brands needing user research | Research-heavy tests for BioLite and Peak Design | 9 |
Counts are tests credited to each agency or its founder in our database, as of November 2026. A bigger number means more public proof, not a better agency.
The 14 best ecommerce CRO agencies
1. Conversionwise (Oliver Kenyon)
Based in: Bristol, UK, with a London address, per its contact page.
What they do: Oliver Kenyon co-founded Conversionwise and has spent 13 years in ecommerce CRO.
The Conversionwise site lists ongoing CRO testing, landing pages and funnels, redesigns, Shopify development, audits and workshops, and says it has worked with 4,000+ brands since 2013.
Known for: tests judged on revenue per visitor.
Adding a dispatch, returns and payment block under the checkout button in the cart drawer lifted revenue per visitor by +23.8%.
Removing a 1/2/3-bag bundle selector from a travel bag brand's product page gave +7.8% revenue per visitor.
Tests in our archive: 100, all ecommerce. See Oliver Kenyon's practitioner page.
All 100 are published as wins, so ask for flat and losing tests on the first call.
Best for: brands that want one team for research, testing and Shopify builds.
Not for stores too small to reach a result in a few weeks.
2. Maison Commerce (Kasper Dolk)
Based in: the EU, per the Maison Commerce site (city not stated).
What they do: Shopify CRO with conversion-focused themes, product pages, landing pages and four to six A/B tests a month.
The site says first deliverables ship in 10 to 15 days and it takes a maximum of four new brands a month.
Known for: clients such as ICON Amsterdam and HiStrips.
In our archive, moving the FAQ higher took revenue per visitor from €2.17 to €2.45 (+13.08%).
Tests in our archive: 30, on Kasper Dolk's page. All are published as wins.
Best for: Shopify brands doing €100k+ a month.
Not for non-Shopify stores or brands below that line, which the site says are better served by a call than a program.
3. Scaling CRO (Peter Christensen)
Based in: not stated on scaling.co.
What they do: a system that ties customer research, ad messaging, landing pages, on-site tests and post-purchase offers into one roadmap.
The site says engagements start at $10K a month, it takes brands doing $1M or more a month, and it keeps a maximum of 12 active clients.
Known for: deep work on fewer accounts, with the founder in each one.
In our archive, removing the "Track Order" link from the main navigation gave +30% revenue per visitor.
Tests in our archive: 7, on Peter Christensen's page.
Best for: established DTC brands with a big ad budget.
Not for smaller stores: the entry price and revenue bar rule most out.
4. Tailored Commerce (Ruben)
Based in: not stated on tailoredcommerce.co.
What they do: a small Shopify CRO and design agency.
The site says first tests go live within a week, a research report and roadmap follow within 30 days, and contracts run month to month with 30 days' notice.
Known for: the site claims a 41% conversion rate increase in six months for Mayson.
Ruben also publishes mixed results: a countdown timer tested across several brands gave about +10% conversion rate on a low-priced brand but is listed as lost overall.
Tests in our archive: 5 (3 won, 1 flat, 1 lost), on Ruben's page.
Best for: 7- and 8-figure Shopify brands that want no annual contract.
Not for brands that need a large in-house-style team.
5. Syntra Labs (Dave Diederen)
Based in: not stated on syntralabs.com.
What they do: a subscription service: you send requests for A/B tests, designs and Shopify development, and the team works through them.
The site describes plans that deliver roughly 2-3 or 7-10 A/B tests a month, and says you can pause anytime.
Known for: publishing a large share of results, losses included.
Removing the email popup cost -20.51% revenue per visitor, and a countdown timer for a European market cost -35.61%.
Tests in our archive: 162 (151 won, 2 flat, 9 lost), on Dave Diederen's page.
Best for: brands with a steady list of ideas that want fast builds.
Not for brands that need someone else to own the whole strategy on the lower plan.
6. Blend Commerce
Based in: registered office in London, UK, per Companies House.
What they do: Shopify CRO, including research, roadmaps, A/B testing, redesigns and implementation.
Known for: a public library of Shopify A/B tests.
A simplified mobile menu gave +11.11% revenue per visitor.
It also published losses, like product page accordions at Vegepod (-8% revenue per visitor overall).
Tests in our archive: 150 (139 won, 7 flat, 4 lost), on the Blend Commerce page.
Best for: Shopify brands that want to read many past tests before hiring. Not for stores on other platforms.
7. DRIP Agency
Based in: Traunstein, Germany (Drip Trading GmbH), per its imprint.
What they do: experimentation for online shops from €100k a month, either done for you or run by your team in its own testing tool, Apex.
Known for: long-running programs for European brands, such as its SNOCKS case study.
In our archive, rewritten product descriptions at KoRo gave +3.4% revenue per user.
A more prominent money-back guarantee lost, at -9.2% purchases.
Tests in our archive: 41, on the DRIP Agency page.
Best for: mid-size and large European shops. Not for stores under its €100k/month line.
8. Clean Commit
Based in: nowhere in particular: its about page says the team is fully remote and never had an office.
What they do: CRO for Shopify brands. Its homepage says it needs 30,000+ monthly sessions, offers the first month free, then charges $5,950 a month, with 4-8 experiments a month for stores with 50k+ sessions.
Known for: publishing its whole test library, not only winners.
Replacing a trust-focused hero with a sales carousel cost -46.2% conversions.
Tests in our archive: 173 (16 won, 122 flat, 35 lost), on the Clean Commit page.
That honest win rate is what most agencies' real numbers look like.
Best for: stores that want clear pricing and a free trial month. Not for low-traffic stores.
9. SplitBase
Based in: Montreal, Canada, per its company info page.
What they do: research-led CRO and landing pages for 8- and 9-figure DTC brands, most on Shopify.
The SplitBase site says programs typically run $8,500 to $15,000 a month and that it has worked with brands since 2015.
Known for: clients such as Dr. Squatch and the BestSelf case study.
In our archive, defaulting the quantity selector to two soaps gave up to +54% revenue per user.
Tests in our archive: 15, on the SplitBase page. Several are bundled changes, not single-change tests.
Best for: brands doing $10M+ a year. Not for smaller stores.
10. Convertibles
Based in: not stated on convertibles.dev.
What they do: CRO-led growth for Shopify brands doing $2M+, including tests, landing pages, speed fixes and dev work.
The site says the first test goes live in week three.
Known for: cart drawer and pricing tests, like its BFCM sale price case study.
Showing the calculated sale price instead of "25% off" was worth +$102K/month.
A strap cross-sell in the cart drawer lost, at -10% to -12% revenue.
Tests in our archive: 46 (42 won, 1 flat, 3 lost), on the Convertibles page.
Best for: Shopify brands past $2M. Not for non-Shopify stores.
11. Conversion Fanatics
Based in: not stated on conversionfanatics.com.
What they do: A/B testing and CRO services.
The site says it has helped over 350 companies since 2014 and doesn't cap the number of tests a month.
Known for: short case studies like FeatSocks subscription sales.
In our archive, a bulk discount banner after add to cart gave +70.5% revenue per visitor.
Tests in our archive: 38 (35 won, 3 lost), on the Conversion Fanatics page. Many are older tests.
Best for: stores that want a high test pace.
Not for buyers who need recent published proof.
12. GrowthRock
Based in: San Jose, California, with a fully remote team, per its about page.
What they do: ecommerce A/B testing for 7-, 8- and 9-figure sites.
It was founded in 2013 and keeps a live database of its own tests, labeled by purpose.
Known for: its free shipping case study. A free shipping message under add to cart gave a furniture store +19% orders but a supplement store no change in conversion.
Tests in our archive: 18, including flat results, on the GrowthRock page.
Best for: data-minded teams that like a method.
Not for brands wanting design and dev under the same roof.
13. Prismfly
Based in: Dallas, Texas, per its Built In profile.
What they do: CRO, development, design and lifecycle marketing for ecommerce brands.
Its homepage cites a 43% A/B test win rate for one fashion client.
Known for: clients like Princess Polly and the Revival Rugs case study, where showing percent saved next to the sale price gave +11.5% add to cart.
Tests in our archive: 10, on the Prismfly page.
Some are before/after redesigns, which are weaker proof than A/B tests.
Best for: DTC brands that want testing, theme work and email from one partner. Not for buyers who only want testing.
14. Surefoot
Based in: not stated on surefoot.me (the company is surefoot Group, LLC).
What they do: senior-led A/B testing, user research and experiments for established digital brands.
Known for: research-heavy work like the BioLite case study, where explaining contact fields in Shopify checkout gave +18% transactions.
It also published a stopped test: a swatch navigation test at The Shade Store at about -82%.
Tests in our archive: 9, on the Surefoot page.
Best for: brands that want customer research before tests.
Not for buyers who want a price on the website.
Which one is right for you
Shopify brands doing $100k to $1M a month
Start with Conversionwise or Maison Commerce. Both build and test on Shopify, so you don't need a separate developer.
Tailored Commerce suits brands that want a month-to-month contract.
DTC brands doing $1M+ a month
Scaling CRO and SplitBase work on offers, landing pages and the full funnel, not just page elements.
Both list prices on their sites, and both are among the most expensive here.
European shops
DRIP Agency in Germany and Maison Commerce in the EU.
UK buyers can add Conversionwise and Blend Commerce, the two UK agencies here.
Tight budget or a test backlog
Syntra Labs runs on a pausable subscription. Clean Commit publishes its price and gives the first month free if you have the traffic.
You want research before testing
Surefoot and GrowthRock. If you're not ready for a retainer, a one-off CRO audit may be the better first step.
How to choose an ecommerce CRO agency
- Read their tests first. Open five to ten of the agency's tests in our database and check they match your pages and price point.
- Ask for losses. An agency with no flat or losing tests to show either hides them or doesn't test much.
- Check the metric. Revenue per visitor tells you more than conversion rate, because a discount can lift orders and cut revenue.
- Check the evidence type. A single-change A/B test is stronger proof than a before/after comparison or a full redesign.
- Match your traffic. Clean Commit asks for 30,000+ monthly sessions; check your own numbers with the sample size calculator.
- Ask who builds the tests. Design, development and QA should be in-house or clearly scoped.
- Check the contract. Month-to-month terms, like Tailored Commerce's, lower your risk.
- Ask how tests end. Sample size or duration should be set before launch, not when the result looks good.
Our full guide on how to choose a CRO agency covers questions to ask and red flags.
What ecommerce CRO costs
Three agencies on this list publish prices, as of November 2026. Clean Commit charges $5,950 a month after a free first month.
SplitBase says its programs typically run $8,500 to $15,000 a month.
Scaling CRO says engagements start at $10K a month.
The rest quote after a call. Testing tools are often billed on top.
Our CRO pricing guide covers retainers, audits and consultant rates.
Real results from these agencies
Wins and losses from six agencies on this list:
@oliverkenyon
Convertibles
SplitBase
@kasper_dolk
Clean Commit
DRIP AgencyAnd published losses and flat results from the same agencies, which tell you as much:
@DaveDiederen
Blend CommerceConvertibles
Surefoot
@Rubendgrf
GrowthRockWatch out for
- Win-only portfolios. Most agency case studies only show winners. Clean Commit's 173 published tests include just 16 wins, which is closer to normal.
- Revenue claims without a method. "+$X a month" figures are usually projections from a test period. Ask how they were worked out.
- Bundled redesigns. A rebuilt page that wins doesn't tell you which change did the work.
- Copying another store's winner. The same free shipping line won for one GrowthRock client and did nothing for another.
Browse every agency on our CRO agencies page, or narrow down with Shopify CRO agencies.