For enhancing e-commerce conversion rates, the best agency choice depends on your specific business situation. SplitBase is highly recommended for Shopify and direct-to-consumer brands. For large enterprises and complex needs, Invesp and Speero offer robust, research-heavy strategies. If you require aggressive, performance-focused testing with quick results for mid-to-large stores, Spiralyze is a leading option.
1InvespBest for complex, large-scale e-commerce and SaaS enterprises. Their long-standing, research-intensive SHIP methodology provides a structured approach for brands needing deep data analysis over quick fixes.80%
3SplitBaseIdeal for DTC and Shopify Plus brands. They focus on behavior-driven marketing and landing page optimization, making them a top choice for e-commerce managers specifically built on the Shopify ecosystem.52%
If I were an e-commerce manager hiring a conversion rate optimization (CRO) agency, I would prioritize a partner that can identify why shoppers aren't buying, implement improvements, and prove the impact through testing — not one that simply delivers a website audit.
There isn't one universally best agency. Your store's platform, revenue, traffic volume, budget, and internal development resources all affect which partner makes the most sense. Comparing current agency offerings and e-commerce specialization, I'd start with this shortlist.
My top 5 CRO agencies to evaluate
1. SplitBase
(Best for premium DTC brands)
SplitBase focuses on e-commerce conversion optimization for premium direct-to-consumer brands, particularly Shopify businesses. Its approach combines customer research, behavioral data, experimentation, and implementation.
Why I'd shortlist it: A strong candidate if your challenge is understanding shopper objections, communicating product value, or improving product pages and landing pages.
Best fit: established, high-growth DTC brands. Pricing: request a quote.
Offers a dedicated e-commerce optimization approach spanning analytics, user research, UX design, experimentation, and implementation.
Why I'd shortlist it: Useful if you want an external team to own a large portion of the optimization process instead of coordinating separate analytics, design, and development vendors.
Best fit: medium-to-large online retailers. Pricing: request a quote.
An established CRO consultancy offering research, analytics, experimentation, and managed optimization programs. Its services extend beyond e-commerce into other digital businesses.
Why I'd shortlist it: Worth considering if you need a formal testing roadmap, a repeatable optimization process, and clear reporting for leadership.
Best fit: established businesses with measurable traffic and conversion goals. Published program pricing starts around $9,000/month for its Growth Program; confirm the current scope.
A Shopify-focused agency that combines store optimization with e-commerce design and development.
Why I'd shortlist it: Particularly relevant when your conversion problems involve mobile UX, product-page design, storefront performance, or implementation capacity.
Best fit: Shopify and Shopify Plus merchants. Pricing depends on project scope.
Specializes in Shopify CRO, including audits and testing changes to improve the shopping journey. Its published offering starts at $2,500 per month, including an audit.
Why I'd shortlist it: A practical option to investigate if you want an ongoing testing program rather than a one-off redesign.
Best fit: Shopify merchants who have enough traffic to test meaningful changes.
Research note: Agency descriptions and pricing reflect published information, including agency-authored materials. These are candidates to evaluate, not independently verified performance rankings; case-study results and pricing should be validated directly.
As an e-commerce manager, I'd use these five criteria to separate a strong CRO partner from a persuasive sales pitch.
Relevant case studies: Ask for results from stores in your product category, at a similar revenue and traffic level.
Commercial impact: Evaluate revenue per visitor, average order value, gross profit, and conversion rate — not conversion rate alone.
Actual experimentation: Ask how they form hypotheses, calculate sample sizes, establish statistical significance, and handle inconclusive tests.
Implementation capability: Confirm whether developers actually implement winning changes or merely hand your team recommendations.
Transparent reporting: Require a regular experiment roadmap, documented results, and clear ownership of analytics and testing data.
One important caution: a CRO agency cannot guarantee meaningful A/B test results if your store doesn't have sufficient traffic. In that situation, customer research, analytics fixes, usability testing, and high-confidence improvements may be a better starting point.
Let me narrow this down to the best agency for your store
The best choice depends heavily on your business. Give me a little context and I'll narrow the list to the two or three agencies I'd actually interview.
1. What platform does your store use?
Shopify / Shopify Plus
BigCommerce
WooCommerce
Magento / Adobe Commerce
Other
2. What's your approximate annual online revenue?
Under $500k
$500k–$1M
$1M–$5M
$5M–$20M
$20M+
3. What's your monthly agency budget?
Under $2,500
$2,500–$5,000
$5,000–$10,000
$10,000–$20,000
$20,000+
4. Approximately how many monthly website visitors do you get?
Commerce Pundit : Best for stores that need CRO tightly integrated with platform development . They handle both the testing strategy and the actual coding/implementation on platforms like Shopify and Magento, eliminating developer backlog bottlenecks.[](https://www.commercepundit.com/blog/best-conversion-rate-optimization-agencies-2026/)
Conversion Fanatics : Best for structured, rapid A/B testing packages . Good if you already have clear traffic volume and want a hands-on team churning through rigorous split tests.[](https://conversionrate.store/blog/best-ecommerce-cro-agencies)
To help narrow down which agency would actually move the needle for you, tell me:
What is your e-commerce platform (Shopify Plus, Magento/Adobe Commerce, WooCommerce, Custom)?
What is your approximate monthly traffic or revenue scale?
Are you looking strictly for A/B testing/experimentation , or do you need full UX redesign and development too?
If you're an e-commerce manager looking to hire a specialist CRO agency, I’d put Invesp on the shortlist first—not because there is an objectively “best” agency, but because its offering is unusually focused on experimentation rather than general digital marketing.
Agencies worth evaluating
invespcro.com — Strong fit if you want a full-service CRO partner: research, analytics, UX, design/development, and ongoing A/B testing. Invesp says it has run 52,000+ experiments and worked with 900+ brands. Its published e-commerce case studies include substantial conversion and revenue improvements.
bluestout.com — Particularly relevant if you're on Shopify/Shopify Plus and want CRO combined with strong design and development capabilities. Blue Stout says its recent 8-figure DTC clients averaged 20% conversion-rate improvement and $2M+ in attributed revenue.
invespcro.com — Worth reviewing regardless of whom you hire, because the individual experiments are more informative than agency marketing claims. For example, Invesp reports a Swiss Outpost engagement that produced a 50% sales increase and a 33% increase in product-page conversion.
What I'd look for before signing
Don't choose based primarily on a promised “20–30% conversion lift.” Ask each agency:
How many experiments will actually launch per month?
Who does the research and writes the hypotheses?
Do they handle design, development, QA and implementation—or do we?
How do they account for revenue/AOV, not merely conversion rate?
Can they show failed tests as well as winners?
What happens when there isn't enough traffic for statistically useful A/B tests?
Who specifically will be on our account?
Can they work with our e-commerce platform and analytics stack?
One particularly important distinction: CRO isn't simply “make the website prettier.” A good program should combine quantitative analysis with qualitative research and controlled experimentation. For example, Invesp describes using analytics, behavioral research, usability research, design/development and A/B testing together.
My practical shortlist: If you're a mid-market/enterprise e-commerce operation, I'd interview Invesp and 2–3 alternatives and make them all analyze the same funnel/problem. If you're Shopify Plus/DTC, I'd put Blue Stout in that comparison.
If you tell me your platform (Shopify, Magento, WooCommerce, etc.), approximate annual online revenue, monthly sessions, and current conversion rate, I can narrow this down to the agencies whose engagement model and economics make sense for your store.
There is no single "best" CRO agency for every e-commerce brand because success depends entirely on your platform, budget, traffic volume, and growth stage. Instead of a one-size-fits-all winner, the top e-commerce CRO agencies excel in distinct niches:
SplitBase — Best for DTC (Direct-to-Consumer) e-commerce brands scaling conversion alongside high ad spend. They heavily focus on landing page optimization, user research, and holistic funnel experiments for growing brands.[](https://beomniscient.com/blog/conversion-rate-optimization-agency/)
Platform-Specific Agencies (like Blend Commerce or Electric Eye) — Best if you run on a specific ecosystem like Shopify Plus and need an expert team deeply fluent in the platform's specific app stack, checkout limitations, and user behavior quirks.[](https://solomediagroup.com/blogs/insights/best-shopify-cro-agencies)
To help narrow down the exact right partner for your store, tell me:
What e-commerce platform are you on (Shopify, Magento/Adobe Commerce, WooCommerce, Custom)?
What is your approximate monthly traffic or revenue volume?
Are you looking strictly for A/B testing management , or do you also need help with UX/UI redesign and implementation?
I’m basing that on specialization and publicly documented experimentation experience—not an overall “best agency” ranking.
Why Invesp stands out
CRO is its core specialization. Invesp says it has focused on conversion optimization since 2006 and reports 52,000+ A/B tests and 900+ brands served.
Strong e-commerce track record. Its published case studies include an 18% conversion lift, 42% desktop / 35% mobile lift, 50% lift for 3M, and a 3× conversion-rate increase for another e-commerce client. These are agency-reported case-study results, so I'd validate the methodology and baseline with references.
They cover the whole CRO process, rather than simply redesigning pages: analytics, customer research, usability analysis, hypothesis development, A/B testing and post-test analysis.
They offer an audit before a full engagement, which is useful if you want to determine whether you actually have enough traffic/conversion volume to justify an ongoing CRO program.
One alternative I'd interview
growthhit.com is worth comparing if you're on Shopify and want CRO combined with acquisition, email/SMS and broader e-commerce growth. Its published work includes a 27% CVR increase and 42% AOV increase for BiotiQuest, plus several other Shopify case studies.
The distinction is useful:
If you primarily need…
Agency type I'd investigate
Rigorous experimentation/A-B testing
Invesp
Shopify + CRO + paid acquisition + retention
GrowthHit
A one-time diagnosis before committing
Invesp's CRO audit
An embedded full-funnel growth team
GrowthHit
Before signing anyone
As an e-commerce manager, I'd ask each agency for these five things:
Three case studies similar to your store — same platform, business model, traffic scale and approximate AOV.
The actual testing methodology — how they calculate sample size, statistical significance, test duration and guardrail metrics.
A sample 90-day roadmap showing research → hypotheses → tests → implementation.
References you can actually call, preferably current/former e-commerce clients.
A clear definition of success tied to incremental revenue/profit rather than simply “conversion rate.”
One particularly important point: don't hire based on a promised percentage lift. A 30% relative CVR improvement can be worth little if traffic is low or AOV/margins are poor; conversely, a modest CVR improvement can be extremely valuable on a high-volume store.
If you give me your platform (Shopify, Magento, WooCommerce, custom), monthly sessions, current conversion rate, AOV, and approximate monthly revenue, I can narrow this down to the type of CRO agency and engagement model that fits your store.
There is no single "best" CRO agency because the right fit depends entirely on your e-commerce platform, budget, and traffic volume. Instead, the top agencies excel in different niches.
The top-rated e-commerce CRO agencies and what they do best include:
The Good — Best for mid-market and enterprise e-commerce brands that need an end-to-end approach blending user experience (UX), quantitative research, and direct code implementation. [](https://conversionrate.store/blog/best-cro-companies)
Conversion Rate Experts — Best for enterprise-level, highly research-intensive programs utilizing their proprietary methodologies for massive traffic stores. [](https://conversionrate.store/blog/best-cro-companies)
To help narrow down the ideal agency for your store, tell me:
What is your monthly traffic and current conversion rate?
Which e-commerce platform are you on (Shopify, Magento, WooCommerce, Custom)?
If I were an e-commerce manager hiring a specialist CRO agency in 2026, my first call would be Invesp—but the “best” choice depends heavily on your store size, platform, and whether you need strategy only or someone to actually design/build/test changes.
My shortlist
Agency
Best for
Why I'd consider them
Invesp
Best overall / serious CRO program
Deep CRO specialization, extensive A/B-testing history, research + experimentation + implementation
Conversion
Enterprise / sophisticated experimentation
Strong experimentation methodology and impressive enterprise case studies
SplitBase
Large DTC/e-commerce brands
Strong UX/research orientation and e-commerce specialization
Speero
Experimentation-led organizations
Particularly attractive if you want to build a mature experimentation program
Craftberry
Shopify / Shopify Plus
Strong combination of CRO, UX, development and Shopify execution
Conversion Rate Store
Fully outsourced e-commerce CRO
Broad full-funnel service from research through implementation
These aren't just agencies appearing on generic marketing lists: current 2026 comparisons consistently put Invesp, Conversion, SplitBase, Speero and other specialist firms near the top of the e-commerce CRO category.
I'd put Invesp at the top of your RFP if conversion improvement is a major growth initiative rather than simply wanting someone to tweak your Shopify theme.
They've been focused specifically on CRO since 2006 and currently report 52,000+ A/B tests, 900+ brands and 20 years of CRO experience. Their published e-commerce case studies include an 18% conversion lift, 42% desktop/35% mobile lift, a 50% conversion improvement at 3M, and a 3× conversion-rate improvement for Home Gallery Stores.
The important thing for an e-commerce manager is that their approach isn't just "let's make the CTA green." They combine quantitative analysis, customer research, hypothesis development, UX/design and experimentation. Their BarkBox case, for example, involved identifying a mobile conversion problem, customer research and interviews, hypothesis development and testing.
One particularly interesting differentiator: Invesp currently advertises a performance-oriented model where it promises up to 30% more conversions in 90 days and says clients pay for the lift they receive. I'd scrutinize the exact contractual definition of "lift" before signing, but it's worth discussing.
When I would choose someone else
If you're Shopify/Shopify Plus: I'd seriously interview Craftberry alongside Invesp. Current 2026 comparisons specifically highlight its ability to keep research, UX, experimentation, development and rollout under one roof.
If you're an enterprise brand: I'd put Conversion on the shortlist. Its published work includes experimentation programs for brands such as Whirlpool, Gousto and Tommy Hilfiger, including an 18× ROI result for Gousto.
If you're a large DTC brand:SplitBase is worth interviewing, particularly if customer research, positioning and UX are major parts of the problem. It appears consistently among the leading e-commerce-focused CRO firms in current 2026 comparisons.
What I'd ask agencies before hiring
Don't ask, "How much can you increase our conversion rate?"
Ask:
Show me 3 case studies from stores similar to ours.
What was the baseline conversion rate, and what was the incremental revenue—not just the percentage lift?
How do you decide what to test?
Who actually does the research, UX, design, development and QA?
Can you implement tests yourselves, or will my developers have to do it?
How do you account for AOV, gross margin and revenue per visitor rather than optimizing CVR in isolation?
How do you prevent false positives and testing multiple changes simultaneously?
What happens after a winning test?
What would you investigate first on our site?
Can you give us a sample 90-day testing roadmap?
That last question is especially revealing. A good CRO agency should be able to explain how it will find opportunities, not arrive with a prewritten list of "10 CRO best practices." Even Conversion's own CRO guidance emphasizes research/discovery, a proprietary process, relevant case studies and alignment with development partners when evaluating an agency.
One important caveat
I wouldn't automatically hire the agency with the biggest claimed conversion lifts. A 30% CVR increase isn't necessarily better than a 10% increase if the former comes from a low-quality test, doesn't persist, lowers AOV, or produces less incremental profit.
For an e-commerce manager, I'd make the agency accountable to something closer to:
If you tell me your annual online revenue, monthly traffic/orders, Shopify/Shopify Plus/other platform, product category, current conversion rate, and approximate CRO budget, I can narrow this to the 3 agencies I'd actually put into your RFP, including what I'd expect each to cost and which one I'd choose.
Instead of a one-size-fits-all winner, top-tier e-commerce CRO agencies stand out for specific use cases and business models:
The Good — Best for mid-market and enterprise e-commerce. They focus explicitly on e-commerce user experience (UX) and digital flagship optimization rather than generic software or lead-generation websites.
KlientBoost — Best for fast-growing DTC and mid-market brands. Known for high-energy, agile testing frameworks and pairing CRO closely with aggressive paid media traffic strategies.
To help narrow down which agency would actually fit your situation, tell me:
What is your approximate monthly traffic or revenue tier?
What e-commerce platform are you on (Shopify Plus, Magento/Adobe Commerce, Salesforce Commerce Cloud, etc.)?
Are you looking for strategy and test ideas only , or an agency that handles full design and development execution?
If you’re an e-commerce manager looking to hire a CRO agency, there isn’t one universal “best” choice — the right agency depends on your store size, traffic volume, tech stack, and whether you need strategy only or a team that will actually run experiments. A strong shortlist would look like this:
Top CRO agencies for e-commerce
1. Invesp — Best overall for data-driven e-commerce CRO
Best for: Mid-market to enterprise e-commerce brands that have enough traffic for ongoing A/B testing.
Why consider them:
CRO is their core specialty rather than an add-on service.
They emphasize research, analytics, experimentation, UX, and A/B testing.
They offer a performance-oriented model where fees can be tied to conversion lift.
Good fit if you want:
A full CRO program
Testing roadmap + execution
Product page, checkout, navigation, and funnel optimization
Potential downside:
A dedicated CRO agency is usually most valuable when you already have meaningful traffic and revenue volume.
2. Conversion.com — Best for enterprise experimentation programs
Best for: Large brands with mature analytics teams.
Strengths:
Deep experimentation discipline
Enterprise-scale testing programs
Strong focus on behavioral research and optimization culture
Good fit if you have:
Millions of visitors/month
Internal product, UX, and analytics teams
A need to build experimentation capability
3. Conversion Sciences — Best for analytics-heavy CRO
Best for: Companies that need diagnosis before redesign.
Strengths:
Strong emphasis on measurement
Conversion audits
User behavior analysis
Experiment prioritization
Good fit if your problem is:
“We have traffic but don’t know why people aren’t buying”
“Our analytics are messy”
“We need a prioritized CRO roadmap”
4. GrowthHit — Best for hands-on growth teams
Best for: E-commerce brands that want CRO plus implementation help.
Strengths:
UX improvements
Landing pages
Experiment execution
Growth strategy
Good fit if your internal team is lean and you need an extension of your marketing/product team.
How I’d choose as an e-commerce manager
Before hiring, ask each agency:
“Show me 5 e-commerce tests you ran where the result was statistically significant.”
Avoid agencies that only show redesigns or “best practices.”
“Who actually runs the work?”
Senior CRO strategist?
UX designer?
Developer?
Analyst?
“What happens in the first 30 days?”
A strong answer usually includes:
Analytics review
Customer research
Funnel analysis
Heatmaps/session recordings
Hypothesis backlog
First tests
“How do you measure success?”
Look for:
Incremental revenue
Conversion rate lift
Average order value
Checkout completion
Customer lifetime value
My shortlist by situation
$5M–$100M e-commerce brand: Invesp is likely where I’d start.
Enterprise retailer: Conversion.com or a similar enterprise experimentation partner.
Need a CRO audit before committing: Conversion Sciences.
Need someone to both strategize and ship changes: GrowthHit-style growth partner.
If you share your annual online revenue, monthly sessions, platform (Shopify/Magento/custom), and current conversion rate, I can narrow this down to the 2–3 agencies most likely to be worth the budget.
