CRO Agencies for Ecommerce: 8 to Evaluate in 2026

Who this is for: Ecommerce brands doing $2M+/year looking for a CRO partner
What you'll learn: 6 CRO agencies and 2 directories evaluated for high-growth ecommerce
What you need: A clear understanding of your current conversion rate and optimization goals
Time to evaluate: 30 minutes to review this list, 1-2 weeks to shortlist and run discovery calls
Last reviewed: July 2026

Written and maintained by the CRO team at Convertibles, a Shopify growth partner specializing in conversion optimization for $2M+ ecommerce brands. We've run 1,000+ 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 best CRO agencies for ecommerce in 2026 include Invesp (established global CRO with 18 years of testing data), SplitBase (brand-aligned optimization for 8-9 figure DTC), Speero (research-driven experimentation systems), Convertibles (full-stack CRO for Shopify Plus), and Craftberry (boutique Shopify Plus agency with 800+ launched projects). We also include NoGood, a growth marketing agency for brands whose conversion problem is really a full-funnel growth problem. For building a broader shortlist, Clutch and the Shopify Partner Directory are the two most useful directories.

But a list of names isn't what you actually need. The harder question is how to choose an ecommerce CRO agency that fits your stage, platform, and growth goals. Below, we break down what to look for first, then evaluate each option in detail.

Quick Pick: Which CRO Agency Fits Your Stage?

• Mid-to-enterprise, platform-agnostic, research-first: Invesp. 18 years and 36,600+ experiments of institutional testing data.
• Shopify Plus, $10M+ DTC (beauty, health, lifestyle): SplitBase. Brand-aligned offer, pathway, and experience testing.
• Enterprise, $50M+, building an experimentation culture: Speero. Systems-level experimentation operating system across teams.
• Shopify Plus, $2M-$50M, heavy paid media ($50K+/mo): Convertibles. Full-stack CRO with ad-to-landing-page continuity for paid traffic.
• Shopify Plus brands needing custom build plus ongoing CRO: Craftberry. Full-service Shopify partner with CRO baked into development.
• Full-funnel growth mandate (paid, organic, creative), not pure CRO: NoGood. Growth marketing with CRO as one input rather than the whole engagement.
• Still building a shortlist: Use Clutch for verified reviews or the Shopify Partner Directory for vetted platform experts.

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.

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 ecommerce brands spending $50K+/month on 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.

1. 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

2. 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

3. 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

4. Convertibles

Best for: Shopify Plus brands ($2M+ revenue) that want full-stack CRO, not generic A/B testing.

Convertibles is a CRO-led Shopify growth partner that closes the gap between paid advertising and on-site experience, with testing and landing page optimization mapped to active ad campaigns. Founded in 2023, this Shopify CRO agency targets Shopify Plus brands doing $2M+ in annual revenue with paid media budgets of $50K+/month. Engagements begin with audience mapping from analytics and ad account data, then ship 2-4 personalized experiences per month. Tests run as multi-variation experiments through Intelligems, typically reaching statistical significance in two-week cycles, with real-time client visibility through TestBuddy.

Published case studies include a PDP size selection optimization (+$386K/month est. revenue from a buy box reorder), a cart drawer checkout button test (+$389K/month est. revenue from adding total price and a lock icon), and a cart drawer free gift progress test (+$50K/month est. revenue, where the simplest progress message beat three richer variations). The full case study library includes 30+ published tests across product pages, collections, cart drawers, homepages, and checkout flows.

Not a fit for: Early-stage brands with limited budgets, or teams looking for a full-service agency that also handles site builds, migrations, or media buying.

Website: convertibles.dev

5. 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

6. 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

7. Clutch (CRO Agency Directory)

Best for: Brands that want to compare multiple conversion optimization companies based on verified client reviews.

Clutch isn't a CRO agency. It's a B2B directory with verified, interview-based client reviews. Clutch analysts actually phone an agency's former and current clients to gather detailed feedback, which makes their reviews more trustworthy than typical star ratings.

The most useful features: filter by location, budget range, minimum project size, and "Service Focus" percentage. An agency showing 100% focus on conversion optimization is more likely to be a true specialist than a generalist listing CRO as one of twelve services.

One caveat: "Featured" placements on Clutch are paid. Prominence doesn't equal quality. Use Clutch as a discovery tool to build your initial shortlist, then do your own due diligence from there.

Website: clutch.co/agencies/conversion-optimization

8. Shopify Partner Directory

Best for: Shopify and Shopify Plus merchants who need a CRO partner with verified platform expertise.

The official Shopify Partner Directory is the best starting point for finding conversion optimization companies with guaranteed Shopify proficiency. Every partner has been vetted by Shopify and met their standards for quality and technical skill. Look for the "Shopify Plus Partner" badge to identify agencies with enterprise-level experience.

The directory shows transparent "starting from" pricing, filters for services and location, and reviews from Shopify merchants. It's more limited in scope than Clutch (Shopify ecosystem only), but that limitation is a feature: every agency listed already knows your platform deeply.

Website: shopify.com/partners/directory

Top Conversion Optimization Companies: Side-by-Side

Company	Best For	Core Approach	Platform Focus	Client Size
Invesp	Established, data-driven CRO	Research-led testing (36,600+ experiments)	Platform-agnostic	Mid to enterprise
SplitBase	Brand-aligned DTC optimization	3Ps: Patterns, Perception, Proof	Shopify Plus	$10M+
Speero	Enterprise experimentation systems	Experimentation Operating System (XOS)	Platform-agnostic	$50M+
Convertibles	Full-stack CRO for Shopify Plus	Ad-to-landing-page CRO mapped to paid campaigns	Shopify Plus	$2M+
Craftberry	Full-service Shopify Plus agency with CRO	Psychology-based design and data-driven optimization	Shopify Plus	Growth-stage to enterprise
NoGood	Full-funnel growth, not pure CRO	Growth marketing: paid, organic, creative, analytics	Platform-agnostic	Startup to enterprise
Clutch	Comparing agencies with verified reviews	B2B directory with phone-verified reviews	All platforms	All sizes
Shopify Partner Dir.	Finding Shopify-vetted CRO partners	Official Shopify partner directory	Shopify only	All sizes

About This Analysis

This evaluation was researched and written by Convertibles, a CRO-led Shopify growth partner for brands doing $2M+ in annual revenue. Our team runs full-stack conversion optimization programs, and we publish detailed case studies with real test data. 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, we run full-stack CRO programs for Shopify Plus brands that drive measurable revenue growth, not just isolated conversion rate lifts. Book a free discovery call to see how segment-specific CRO could work for your brand.