Ecommerce CRO Agencies for Shopify Brands (2026): 7 Compared

Who this is for: Shopify brands doing $5M+/year choosing a CRO partner
What you'll learn: 7 ecommerce CRO agencies compared on fit, evidence and trade-offs, plus where else to search
How we judged: Shopify depth, published test evidence, ability to ship winners, revenue-stage fit
Disclosure: We are a CRO agency ourselves. We do not rank Convertibles; our profile sits in its own box below
Last reviewed: October 2026

Written and maintained by the CRO team at Convertibles, a CRO-led growth partner for Shopify brands doing $5M+ a year. We've run 1,200+ A/B tests across product pages, cart drawers, checkout flows, and pricing. The evaluations below are informed by what we see working (and failing) in real programs.

The ecommerce CRO agencies worth comparing for Shopify brands in 2026 are Craftberry (Shopify Plus build plus CRO), Ecomx Agency (build-and-optimize, B2B and multi-market), Invesp (research-led testing with 18 years of data), NoGood (full-funnel growth with CRO as one input), Solo Media Group (CRO plus the dev team to ship it), Speero (enterprise experimentation systems) and SplitBase (brand-aligned optimization for 8-9 figure DTC). They are listed alphabetically, not ranked, because the right pick depends on your stage and what is actually blocking growth. We also profile our own agency, Convertibles (testing plus the team to build and ship winners, for Shopify brands doing $5M+), clearly marked as the publisher and not ranked.

A list of names is the easy part. The harder question is how to choose an ecommerce CRO agency that fits your stage, platform and growth goals. Below: how we evaluated, what to look for, each agency in detail, and a side-by-side table.

Quick Pick: Which Agency Fits Your Stage?

• Shopify Plus brand needing a custom build plus ongoing CRO: Craftberry. Full-service Shopify partner with CRO baked into development.
• Shopify or Plus, needs build, migration, or B2B/international work plus CRO: Ecomx Agency. Development-led partner that folds conversion work into the build.
• Mid-to-enterprise, platform-agnostic, research-first: Invesp. 18 years and 36,600+ experiments of institutional testing data.
• Full-funnel growth mandate (paid, organic, creative), not pure CRO: NoGood. Growth marketing with CRO as one input.
• CRO roadmap stuck behind dev capacity, or optimizing through a migration: Solo Media Group. Platinum Partner that runs research, design and implementation in one team.
• Enterprise, $50M+, building an experimentation culture: Speero. Systems-level experimentation across teams.
• Shopify Plus, $10M+ DTC (beauty, health, lifestyle): SplitBase. Brand-aligned offer, pathway and experience testing.
• Publisher, not ranked: Convertibles. For $5M+ Shopify brands that want testing, Shopify development and paid traffic in one program.

How We Evaluated These Ecommerce CRO Agencies

Every agency on this page was judged on the same four questions:

• Shopify depth: do they work inside Shopify themes, apps and checkout, or across every platform?
• Experiment evidence: do they publish tests with what changed, the metric and the result, or only logos and headline claims?
• Ability to ship: can the same team build and launch winning variations, or does work wait on your developers?
• Stage fit: which revenue range and type of problem they are built for

Sources: each agency's own site and case studies, the Shopify Partner Directory and Clutch, checked October 2026. Client counts, revenue figures and lift numbers below are agency-reported unless we say otherwise. No agency paid to be included. Two disclosures: we are a CRO agency ourselves, so we do not rank Convertibles against the others; and Ecomx Agency and Solo Media Group also mention Convertibles on their own sites.

What to Look for in a Conversion Optimization Company

Most "best CRO agency" listicles give you logos and taglines. They skip the part that matters: how to tell whether an agency will actually move your business forward or just run tests that look busy. The best conversion optimization companies don't just promise to improve your ecommerce conversion rate. They show you exactly how, with data from real tests on brands like yours.

Before you evaluate any agency, assess them on these five criteria:

Clayton Ferguson from the Convertibles CRO team walks through this exact checklist, plus the red flags that filter out 90% of the market, in the video below:

1. What metric do they optimize for?

Conversion rate in isolation is a vanity metric. A 10% discount popup will boost your conversion rate while destroying your margins. The best conversion optimization companies optimize for revenue per session, average order value, or customer lifetime value. Ask any agency you're evaluating: "What's your north-star metric?" If the answer is just "conversion rate," keep looking. And when an agency quotes results, sanity-check them against ecommerce conversion rate benchmarks by industry before you're impressed. Run your own numbers through our ecommerce conversion rate calculator first, so you know where your store sits before any agency tells you.

2. Do they run real experiments or just redesign pages?

There's a meaningful difference between a structured testing program and a one-off redesign with analytics cherry-picked after the fact. Ask about testing velocity (how many experiments per month), statistical significance thresholds, and what percentage of tests actually win. An honest agency will tell you most tests don't produce a winner. That's normal.

3. How deep is their platform expertise?

A CRO agency that works across Shopify, Magento, WooCommerce, and custom builds will never know your platform as deeply as a specialist. If you're on Shopify Plus, you want a partner who understands checkout extensibility, Liquid theme architecture, and how testing tools integrate with the Shopify ecosystem.

4. Can they show you real case studies with specific numbers?

Vague claims like "we increased revenue 300%" without context are meaningless. Look for case studies that specify what was tested, what the control looked like, what the variation changed, and what the measured impact was. Bonus points if they publish losses too, because that signals intellectual honesty.

5. How do they handle the ad-to-site gap?

For brands putting serious budget into paid ads, this is critical. Your ad promises one thing. Your landing page delivers something generic. The best conversion rate optimization services connect the entire journey from ad click to purchase, personalizing the on-site experience based on where the visitor came from and what they were promised.

Craftberry

Best for: Shopify Plus brands that need a long-term development and CRO partner with deep platform expertise and high-touch service.

Craftberry is a boutique Shopify Plus agency that has been building and optimizing ecommerce stores since 2015. With 800+ launched projects and $450M+ in revenue generated for clients, they combine custom design, development, and conversion rate optimization under one roof. Their client retention rate of 90% over 2+ years speaks to the depth of their partnerships.

Their approach blends psychology-based strategies with data-driven optimization. Rather than treating CRO as a standalone service, Craftberry integrates it into their broader development and design work, so optimization decisions are baked into the store architecture from the start. This makes them a strong fit for brands that want one team owning both the technical build and ongoing performance improvements.

Notable clients include ON Running, vivo, Pepper, Shelly. They maintain a 5.0 rating across 27+ verified reviews, and their team handles everything from custom theme development and platform migrations to tracking setup and third-party integrations.

Not a fit for: Brands looking for a pure-play CRO agency that only runs experiments. Craftberry is a full-service Shopify partner, so they're best suited for teams that also need design, development, or migration support alongside optimization.

Website: craftberry.co

Ecomx Agency

Best for: Shopify and Shopify Plus brands that want conversion optimization, development, and SEO handled by a single team, including B2B and multi-market stores.

Ecomx Agency is a New York based Shopify partner that treats CRO as part of the build rather than a separate testing engagement. Their CRO services span custom theme development, migrations, SEO, and ongoing optimization, which fits brands whose conversion problem is partly a theme or speed problem and partly a funnel problem.

Engagements open with a conversion audit across product pages, cart, and checkout, then move into a continuous cycle of behavioral analysis and testing using Hotjar, Crazy Egg, Optimizely, and VWO. The work covers checkout simplification, value proposition clarity, trust and social proof placement, free shipping threshold strategy, and lifecycle messaging.

Two areas separate them from the pure play CRO shops on this list. B2B and wholesale conversion, where Shopify B2B catalogs, bulk pricing, and login-gated pages get the same conversion lens as retail. And international selling, where geo-detection, currency, translation, and Shopify Markets setup are treated as conversion levers rather than admin tasks. They are a Certified Shopify Partner and work with brands from smaller stores through to Plus.

Not a fit for: Brands that want a dedicated experimentation program with published test results. Ecomx is a build-and-optimize partner, so the fit is strongest when development, migration, or international setup is part of the job.

Website: ecomxagency.com

Invesp

Best for: Mid-to-enterprise ecommerce brands that want an established, data-driven CRO partner with a long track record.

Invesp is one of the longest-running dedicated CRO agencies in the world. Based in Chicago with nearly 18 years of operation, they've worked with over 900 clients and run more than 36,600 A/B tests. Their average client retention is 39 months, which tells you something about consistency.

Their process starts with a conversion research and discovery phase (typically a 2-month engagement) to identify the biggest conversion leaks, then moves into ongoing testing and optimization. They serve ecommerce, SaaS, and lead generation businesses, so they're not Shopify-specific, but they have deep ecommerce experience with clients like Barkbox, ZGallerie, and Catalina Crunch.

Invesp reports a 4.5x higher test success rate than the industry average, with client testimonials citing 18-20% conversion increases and nearly $1M in additional revenue. They also produce substantial educational content through their blog and podcast.

We published a full side-by-side: Convertibles vs Invesp comparison.

Website: invespcro.com

NoGood

Best for: Brands whose conversion problem is really a full-funnel growth problem, with paid, organic, creative, and analytics under one roof.

NoGood is a growth marketing agency (New York, Miami, San Francisco), not a pure Shopify CRO shop, so we list them for a different job. If your conversion rate is dragging because acquisition, creative, and on-site experience aren't pulling in the same direction, NoGood runs that broader mandate, with CRO as one input rather than the whole engagement.

They work across SaaS, fintech, healthcare, and consumer brands, and publish some of the most-cited answer engine optimization research in the space. Pick them when the question is "grow the whole funnel," not "audit and lift my Shopify store's conversion rate."

Not a fit for: Shopify brands that want a dedicated, platform-deep A/B testing program rather than a full growth engagement.

Website: nogood.io

Solo Media Group

Best for: Mid-market and enterprise Shopify brands whose CRO roadmap is blocked by implementation capacity, or who need optimization alongside a migration.

Solo Media Group offers CRO services and is a Shopify Platinum Partner, the top tier of Shopify's Service Track, granted by Shopify based on delivered work rather than applied for. They are based in New York, with offices in Miami and Los Angeles.

What separates them from most CRO shops is that they ship what they find. Where optimization programs typically stall is implementation: a test wins, then sits in a backlog waiting on development capacity. Solo Media Group runs research, design, development, and production implementation inside one team, with 75+ builds and replatforms since 2018 behind the engineering side.

Their CRO work covers conversion research, UX improvements, and performance optimization, with reported results including site speed scores moving from 47 to 99 and conversion lifts of 20-40%. For brands optimizing through a replatform, they handle both: redirect mapping is treated as a design constraint rather than a launch-week task, so organic equity survives the transition.

Clients include Medik8, Manukora, and Wild Planet Foods. They publish their pricing: $150/hour, retainers from $3,000/month, fixed-estimate projects from $20,000.

Not a fit for: Brands wanting a standalone audit or a pure experimentation consultancy. The model assumes implementation is in scope.

Website: solomediagroup.com

Speero

Best for: Enterprise brands ($50M+ revenue) that need to build and scale a structured experimentation program across teams.

Speero, connected to CXL (the well-known optimization training platform), works at a systems level. Rather than running individual tests, they build what they call an Experimentation Operating System (XOS): a framework for orchestrating experiments across marketing, product, and sales teams simultaneously.

Their services span customer research and UX strategy, A/B testing and CRO execution, and analytics engineering. They serve ecommerce and DTC brands alongside SaaS and travel companies. If your challenge is less "we need someone to run tests" and more "we need to build a culture of experimentation across our organization," Speero is purpose-built for that.

The trade-off: Speero's ideal client is a $50M+ revenue company with executive buy-in on experimentation-led growth. Smaller brands will find their systems-level approach over-engineered for their current needs.

We published a full side-by-side: Convertibles vs Speero comparison.

Website: speero.com

SplitBase

Best for: 8-9 figure DTC brands (especially beauty, health, and lifestyle) that want brand-aligned conversion optimization on Shopify.

SplitBase specializes in what they call "brand-aligned conversion optimization" for high-revenue ecommerce. Their client list includes Dr. Squatch, L'Oreal, Kiehl's, and DIFF Eyewear. They report generating over $100M in annual additional revenue across their client base, with 95% client retention after six months and 5x average ROI by month three.

Their methodology (the "3Ps") focuses on Patterns (behavioral and resistance patterns), Perception (brand positioning and competitive advantage), and Proof (A/B testing offers, pathways, and experiences). They optimize what actually drives revenue: offer strategy, purchasing paths, and product education, not surface-level element testing.

SplitBase is an official partner with Shopify Plus, VWO, Convert, Heatmap.com, and Intelligems. They offer three tiers: full-site optimization for $10M+ brands, conversion-focused redesigns, and landing page optimization.

Website: splitbase.com

Publisher's Agency: Convertibles

Top Conversion Optimization Companies: Side-by-Side

Company	Best For	Core Approach	Platform Focus	Client Size
Craftberry	Full-service Shopify Plus agency with CRO	Psychology-based design and data-driven optimization	Shopify Plus	Growth-stage to enterprise
Ecomx Agency	Build-and-optimize Shopify partner, B2B and multi-market	Conversion audit, then continuous behavioral analysis and testing	Shopify and Shopify Plus	Small stores to Plus
Invesp	Established, data-driven CRO	Research-led testing (36,600+ experiments)	Platform-agnostic	Mid to enterprise
NoGood	Full-funnel growth, not pure CRO	Growth marketing: paid, organic, creative, analytics	Platform-agnostic	Startup to enterprise
Solo Media Group	CRO plus the dev team to ship it, migrations included	Research, design, development and implementation in one team	Shopify and Shopify Plus (Platinum Partner)	Mid-market to enterprise
Speero	Enterprise experimentation systems	Experimentation Operating System (XOS)	Platform-agnostic	$50M+
SplitBase	Brand-aligned DTC optimization	3Ps: Patterns, Perception, Proof	Shopify Plus	$10M+
Convertibles (publisher, not ranked)	Testing plus the team to build and ship winners	Research, A/B testing on Intelligems, Shopify development, paid traffic in one program	Shopify and Shopify Plus	$5M+

Other Places to Search

If you want a longer list before shortlisting, two directories are worth an hour:

• Clutch: verified, interview-based client reviews. Filter by "Service Focus" to find true conversion optimization specialists. "Featured" placements are paid, so prominence is not quality.
• Shopify Partner Directory: every listed partner is vetted by Shopify, with "starting from" pricing and merchant reviews. Shopify-only by design.

About This Analysis

This evaluation was researched and written by Convertibles, a CRO-led growth partner for Shopify brands doing $5M+ in annual revenue. Our team runs full-stack conversion optimization programs, and we publish detailed case studies with real test data, including losing tests. Learn more about our team and approach.

Frequently Asked Questions

How much do conversion optimization companies typically charge?

CRO agency pricing varies widely based on scope and specialization. Project-based engagements like a conversion audit typically run $5,000 to $25,000. Ongoing optimization retainers range from $5,000 to $30,000+ per month depending on testing velocity, team seniority, and site complexity. Agencies targeting 8-9 figure brands sit at the premium end of that range, which reflects the revenue impact they deliver. Budget agencies exist, but in CRO, you generally get what you pay for.

What results should I expect from a CRO agency?

Honest agencies will tell you that most individual tests don't produce a statistically significant winner. That's expected and normal. The value comes from the compounding effect of a systematic testing program over time. Expect 3-6 months before you see meaningful, sustained revenue impact. Well-run programs typically produce 10-30% improvement in key metrics within the first year. What matters more than any single test win is the program's cumulative effect on revenue per session.

Should I hire a CRO agency or build an in-house team?

It depends on your traffic volume, budget, and internal capabilities. An in-house team gives you more control but requires hiring specialists in analytics, UX research, development, and experimentation design. An agency brings all of those disciplines from day one. For most ecommerce brands under $100M in revenue, an agency is more cost-effective because you get a full team without the hiring overhead and ramp-up time. We break this decision down in detail in our CRO agency vs. in-house guide.

What's the difference between CRO and personalization?

Traditional CRO tests one experience against a variation for all visitors. Personalization goes further: different visitor segments see different experiences based on their behavior, traffic source, or lifecycle stage. For example, a standard CRO test might optimize a single hero banner for everyone. A personalization program tests different banners for new visitors from paid ads vs. returning customers from email. Both approaches use experimentation, but personalization unlocks gains that one-size-fits-all testing can't reach.

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Looking for a conversion optimization partner that goes beyond generic A/B testing? At Convertibles, our team runs full-stack CRO programs for Shopify brands doing $5M+ a year, measured on revenue per visitor, not isolated conversion rate lifts. Book a free discovery call to see whether it fits your brand.