7 Best CRO Agencies for Ecommerce Stores
Running an ecommerce store can feel like sprinting but going nowhere. You might get tons of visitors, spend heavily on ads, and polish your product catalog. Then just 2% of your visitors actually purchase.
Frustrating. Unless a solid percentage of those visitors buy, all that effort leaks value.
That’s where Conversion Rate Optimization comes in. Instead of focusing on more traffic, CRO improves what you already have by fine tuning your website.
CRO will surprise you: even the most modest improvements compound. Recent industry research shows that companies using CRO report an average ROI of around 223%.
Impressed?
Here are seven agencies that stand out for ecommerce websites that want measurable growth and reliability.
Behind the Shortlist: How We Chose the Top Agencies
We filtered for agencies that satisfy the following criteria:
- Proven performance: Clear lifts in conversions, revenue, or other key metrics from their client work. Bonus points if the company have guarantees or performance-based payment schemes (like in Spiralyze)
- Ecommerce specialization or strong ecommerce case studies (rather than generic marketing, or offering ecommerce CRO as an aside).
- Transparency in their pricing, guarantees, or how they measure success.
- Unique methodology or USP: predictive, experimental, UX and data driven, full funnel, etc. — things that would separate a company from the rest.
- Strong client trust: Case studies, testimonials, or quotes from real clients.
The Cheat Sheet: Quick Comparison Table
In a hurry? Here’s a table to save you time.
1. Spiralyze: Predictive, Full Service CRO With Aggressive Targets
Spiralyze is a full service CRO agency that has built its reputation around predictive testing. The company uses a proprietary engine that scrapes insights from more than 78,000 websites’ A/B tests to identify winning treatments. With roots in enterprise optimization, Spiralyze is trusted by some of the biggest names in tech.
They’re a performance-based company, which means you pay nothing if you do not see any lift in conversions. Spiralyze positions itself as more than a consultant, they take on design, copy, QA, development, and analytics, promising measurable lifts for ambitious founders.
Services:
- A/B testing
- Design, copywriting, and dev execution
- QA and analytics integration
- Performance based CRO pricing models
Notable Clients: Okta, Workday, ServiceMax, RStudio
“We saw a 125% increase in conversion rate for demo requests.”, Megan Gouveia, Sr. Manager of Digital Marketing, Workday
2. Elogic Commerce: Technical CRO for Complex Ecommerce
Elogic Commerce is a commerce-first delivery partner specializing in complex B2B and scalable B2C eCommerce for enterprise and mid-market brands. Since 2009, the company has delivered 500+ launches with 200+ experts globally and a verified NPS of 70.
What sets Elogic apart in CRO is its engineering-first approach. Instead of treating optimization as surface-level UX tweaks, the team combines experimentation, analytics, and deep technical implementation — including ERP- and CRM-integrated commerce environments. This makes Elogic a strong fit for brands running complex Shopify Plus, Adobe Commerce, or composable architectures where CRO requires real backend changes, not just design adjustments. Their SLA-based managed services (optional 24/7 coverage) ensure optimization is continuous, measurable, and aligned with long-term growth.
Elogic is an Adobe Commerce (Magento) Silver Partner and a Hyvä Certified Partner.
Services:
- Conversion rate optimization & experimentation roadmaps
- UX audits and data-driven optimization
- Shopify Plus and Adobe Commerce performance improvements
- ERP- and CRM-integrated optimization initiatives
- Full technical implementation of CRO changes
Notable Clients:
HP Inc., HanesBrands, TeamViewer, BUFF, Philips Healthcare, and Siemens.
3. Single Grain: CRO Meets Full-Funnel Growth
Single Grain blends CRO with performance marketing. Known for their podcast (Leveling Up) and thought leadership, they’ve built a reputation for scaling big names and ambitious startups alike.
Their USP is integration. CRO is part of their larger growth playbook, alongside SEO, PPC, content, and paid social. This makes Single Grain an ideal choice for founders who want both conversions and traffic growth under one roof.
Services:
- CRO audits and A/B testing
- SEO and paid media campaigns
- Content and funnel strategy
- Full-funnel growth consulting
Notable Clients: Uber, Amazon, Airbnb
“Single Grain enables us to increase our impact without increasing our headcount” – Kim Cooper, Director of Marketing, Amazon Alexa
4. craftberry: a certified Shopify Plus agency
craftberry is a certified Shopify Plus agency that combines design, development, and conversion rate optimization under one roof. With more than 11 years of exclusive Shopify experience, the team has built a strong track record helping DTC brands improve performance across multiple industries.
craftberry’s Shopify CRO methodology focuses on full-spectrum optimization – UX research, analytics audits, and performance engineering into one continuous, revenue-focused system. The agency operates with an in-house team of 30+ Shopify specialists, including CRO experts, developers, UI/UX designers, and project managers.
Services:
- Conversion rate optimization (CRO) audits and A/B testing
- Shopify Plus design and development
- Migrations to Shopify
- UX/UI research and customer journey optimization
- Analytics setup and data accuracy audits (GA4, tracking, attribution)
- Internationalization and multi-market Shopify builds
- Private and public Shopify app development
- Custom integrations
Notable Clients: ON Running, vivo, Pepper, Midi Health, Shelly
“Preslav is a great communicator, and he always keeps me updated.” – Jaclyn Fu, Co-Founder & CEO, Pepper
5. NP Digital: Enterprise CRO With Multi Channel Depth
Everyone in digital marketing knows their founder, Neil Patel. NP Digital has grown into a global marketing powerhouse with a strong CRO division. The agency blends conversion optimization with its larger suite of SEO, paid media, and analytics services. Perfect for scaling.
With global offices and high profile clients, NP Digital leverages deep expertise across verticals and channels.
Services:
- CRO and analytics
- SEO and organic growth
- Paid media and acquisition
- Enterprise strategy consulting
Notable Clients: Adobe, LinkedIn, Western Union, SoFi
“Within just four months, we saw a 200% increase in conversions and significant lifts in organic traffic.”, NP Digital client case study.
6. Convertica: Boutique CRO Built for Ecommerce Growth
Convertica is the only boutique CRO agency focused exclusively on ecommerce optimization in this list. Their team takes a hands on approach, running tests directly and managing the entire experimentation process for founders.
By concentrating on ecommerce clients, Convertica specializes in checkout flows, product page conversions, and subscription optimizations that directly boost revenue. Checkout optimization stuff.
Services:
- Checkout and cart flow optimization
- Subscription conversion improvements
- Full management of A/B tests
- Hands on ecommerce CRO execution
Notable Clients: Just Thrive, Primal Harvest
“Convertica helped us double revenue in under three months without increasing traffic.”, Case study from Just Thrive
7. ConversionTeam: Iterative CRO With UX Depth
ConversionTeam is known for steady, data driven CRO that compounds over time. Rather than promising quick wins, they focus on fixing friction points across the entire customer journey with methodical testing.
They combine user research with iterative testing which makes ConversionTeam consistent in delivering double-digit lifts.
Services:
- UX research and funnel analysis
- Product page and navigation optimization
- Checkout and cart testing
- Ongoing CRO retainers
Notable Clients: U.S. Polo Assn., Skullcandy
Avoid a Mismatch and Choose the Right CRO Partner
Not every store needs the same CRO agency. Here’s a quick checklist:
- Industry expertise: Make sure they’ve worked with ecommerce brands like yours. Nobody wants to be the guinea pig. Especially you.
- Pricing and guarantees: Look for transparency and performance based models if possible.
- Tech stack fit: Shopify brands need different expertise than Magento stores. Got a custom WooCommerce store on WordPress? They should know WP too.
- Team and bandwidth: Ensure they can run enough tests to match your traffic volume.
- Culture and communication: CRO is collaborative; you’ll want an agency that explains, not gates “best kept secrets.”
Parting Shot
Ecommerce growth is not just about more clicks, it is about more conversions. A good CRO agency can double your sales without touching your ad budget. Here’s a quick rundown.
- Spiralyze and Convertica are strong picks for aggressive, data driven results.
- NP Digital and Single Grain are heavyweights for broad growth.
- ConversionTeam and Scandiweb shine for methodical or complex builds.
- Growth Hackers offer a global, holistic approach.
Pick the partner that matches your goals, and you will find those “bricks in your backpack” suddenly much lighter. Thank me later!
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