SplitBase vs Convertibles: Which Shopify CRO Agency Fits Your Brand? (2026)

What is SplitBase?

SplitBase is a conversion rate optimization (CRO) agency, founded in 2015, that runs research-led testing and landing page programs for DTC ecommerce brands doing $10M+ a year.

Here's how it works:

• Who it works with: brands with $10M+ in annual revenue and at least 3,000 orders a month. Most clients do $20M to $100M a year and run on Shopify Plus, in categories like beauty, skincare, health and wellness, supplements, fashion and lifestyle.
• What it does: full-site A/B testing and conversion optimization, landing page design and optimization, conversion-focused website redesigns and Conversion Blueprint CRO audits.
• How it works with your team: SplitBase doesn't run ads. It works alongside your media buyer, your developers and your other agencies, with a shared Slack channel and weekly calls to keep everyone working from the same results.
• Team: 7 to 8 specialists assigned to each project, from researchers and strategists to designers, copywriters, developers, QA and analysts.
• Track record: more than 10,000 A/B tests since 2015 and 23 published case studies that name the client. About 95% of clients stay on past their initial commitment.
• Partners and tools: an official Shopify Plus Partner, and a partner of Intelligems, VWO, Convert and Heatmap. Tests run on whichever tool fits the site: Intelligems, Shoplift, Visually, VWO, Convert, AB Tasty or Optimizely.
• Price and commitment: full-service CRO programs start at $8,500 a month and run up to about $15,000, on a monthly retainer with a 3-month minimum.

What is Convertibles?

Convertibles is a Shopify CRO agency, founded in 2023, that pairs A/B testing with development, site speed work and Google and YouTube Ads in one retainer, for brands from $2M a year.

Here's how its own site describes it:

• Who it works with: Shopify Plus brands from $2M a year. It works only on Shopify and Shopify Plus.
• What it does: CRO and A/B testing, landing pages, speed and development work, and Google and YouTube Ads, all inside one monthly retainer. Meta and TikTok ads stay with your existing team.
• How it works with your team: one team owns testing, development and Google Ads. Its own comparison page says this model is most valuable when those roles aren't already covered in-house or by other agencies.
• Team: an 8-person in-house team covering both CRO and paid media, with offices in New York and Sofia, Bulgaria.
• Track record: 1,200+ tests run, and anonymized test case studies totaling $2.3M+ a month in measured lift. Clients named elsewhere on its site include Jones Road Beauty, Performance Golf and Gymreapers.
• Partners and tools: an official Intelligems partner and a Heatmap partner, plus an in-house dashboard called TestBuddy.
• Price and commitment: no public price. Each retainer is scoped to the brand and runs as an ongoing monthly retainer, with no published minimum term.

How do SplitBase and Convertibles compare side by side?

SplitBase and Convertibles overlap on A/B testing and landing pages. They split on who they're built for, whether they run ads, and how they fit into the team you already have.

The first three rows decide it for most brands.

Information from each agency's website, October 2026.

What does each agency cover, and what stays with your team?

Both agencies own research and testing. The difference is everything around it: SplitBase plugs into the team and agencies you already have, while Convertibles brings ads, development and speed work under its own roof.

Every "No" below is work that stays with your team or another agency.

Here's what that means in practice.

If your brand already has a media buyer, an ad agency or an in-house growth team, SplitBase is built to work with them. Your media team keeps running campaigns, SplitBase builds and tests the pages that traffic lands on, and what each side learns gets shared on weekly calls. Snow Teeth Whitening raised its Meta ROAS by up to 25% during its SplitBase program.

If you're a smaller brand with nobody running Google Ads and no developer on staff, Convertibles' model fills those gaps with one vendor.

How do SplitBase and Convertibles differ in research and testing?

Both agencies run A/B tests and judge them on revenue. They differ most in how much research comes before a test, and in how much weight each one gives your brand.

Research before the first test

Research is where the two agencies differ most. Both start with analytics and add some qualitative research, but SplitBase goes much further on the qualitative side and makes it a formal part of every program.

SplitBase builds every program on its 3Ps Method:

• Patterns: how visitors behave, what's on customers' minds, and the friction that stops them from buying.
• Perception: how your brand looks and sounds, how customers see it, and where it stands against competitors.
• Proof: the tests themselves, on offers (subscriptions, bundles, upsells), pathways (product discovery, landing pages) and experiences (copy, visuals, layout).

On top of that, its SplitBase Intelligence platform tracks what people say about your brand and your competitors across ads, social media and product reviews. Its guide to conversion research for ecommerce walks through the research methods behind the Patterns step.

Convertibles calls its approach the Engineer Growth Method. It starts by auditing your store, ads and analytics to find where revenue leaks, adds heatmaps, session recordings, surveys and review analysis, ranks test ideas by impact, confidence and effort, then rolls winners across segments and feeds what it learns into your Google and YouTube Ads.

Here's how the research methods each agency describes on its own website compare. The bottom half of the table is where SplitBase's qualitative research goes further.

"Not described" means the method doesn't appear on Convertibles' website as of October 2026, not that it's never used.

Brand alignment

At $20M to $100M a year, your brand is one of your biggest assets. A countdown timer or a stack of trust badges can lift one metric and make your site look like everyone else's.

Perception is one of the three pillars of SplitBase's method, so every variant is built inside your design system and judged on revenue per visitor and average order value alongside conversion rate. Convertibles builds tests in theme code from wireframes you approve.

Test volume and statistics

Both agencies run A/B tests, usually with 2 to 4 variants.

Convertibles commits to 2 to 4 experiments a month. SplitBase doesn't publish a monthly test count: the more orders a brand gets, the shorter each test can run and the more tests it can launch, and it puts high-impact hypotheses ahead of test volume.

SplitBase sets a minimum meaningful lift and decision criteria before each test launches, and most tests run 2 to 4 weeks. It optimizes primarily for profit and revenue, along with key metrics such as conversion rate, LTV, churn, and add-to-cart rate. Convertibles holds tests to 95% confidence over full business cycles and tracks year-over-year revenue growth as its program metric.

How do their teams, track records and pricing compare?

SplitBase brings the larger team per account, the longer track record and a published price. Convertibles has the lower revenue floor and bundles ads into the same retainer.

Team

SplitBase assigns 7 to 8 specialists to each project, covering roles from UX research and copywriting to development and QA. Convertibles describes itself as an 8-person in-house team running both CRO and paid media, with no account manager between you and the people building your tests.

Track record

SplitBase has run more than 10,000 A/B tests since 2015, for brands like Dr. Squatch, Kiehl's and Hyperice. Its case studies name the client, and published results include:

• Hyperice: +$934,000 a month in additional revenue and a 78x ROI on the CRO investment
• Dr. Squatch: more than $800,000 a month in additional revenue
• Kiehl's: about $1.6M in additional revenue from cart and checkout optimization
• Transparent Labs: subscription take rate up from 22% to 38%+, and average conversion rate up more than 12%

Across clients, SplitBase reports an average 6–10x ROI on the CRO investment within the first three months. Those results come from specific brands, traffic levels and starting points. They show what a program can do, not what yours will do.

Convertibles was founded in 2023, has run 1,200+ tests, and says its founders bring 10+ years of Shopify development experience and an 8-figure brand exit. Its published case studies are anonymized test results totaling $2.3M+ a month in measured lift; its site says brand names are removed because clients share real revenue data. It also quotes endorsements from leaders at Jones Road Beauty and Gymreapers.

Pricing

SplitBase publishes its starting price: full-service CRO programs from $8,500 a month, running up to about $15,000, on a monthly retainer with a 3-month minimum. Redesigns are priced per project.

Convertibles doesn't publish a price. Each retainer is scoped to the brand and runs as an ongoing monthly engagement with no published minimum term. Its FAQ puts mid-market Shopify CRO retainers at $5,000 to $15,000 a month industry-wide.

When is SplitBase the better choice?

SplitBase is the better choice for established brands doing $10M+ a year that already have a media buyer or agency partners, and want a dedicated team focused on CRO and landing pages.

SplitBase is the stronger fit when:

• You're a DTC brand doing $10M+ a year with at least 3,000 orders a month, in a category like beauty, skincare, health and wellness, supplements, fashion or lifestyle
• You already work with a media buyer, an ad agency or an in-house growth team, and want a CRO partner that works alongside them rather than replacing them
• You want test ideas grounded in deep customer research: post-purchase surveys, interviews, review mining and social listening
• Your brand's look and feel matter as much as your conversion rate
• Subscriptions drive a big share of revenue, and you want a team with a published subscription result (Transparent Labs' take rate went from 22% to 38%+)
• You're planning a redesign and want conversion research behind it, or want a standalone CRO audit first
• Your store runs on a platform other than Shopify

SplitBase doesn't replace your media team. Your media buyer keeps running campaigns, your developers keep the theme healthy, and SplitBase owns research, testing and the landing pages your traffic lands on. It isn't the right pick if you're under $10M a year or 3,000 orders a month, or if you want your Google Ads run by the same agency.

When is Convertibles the better choice?

Convertibles is the better choice for smaller Shopify brands that don't yet have a media buying team or agency partners, and want one vendor to run testing, development and Google Ads.

Convertibles is the stronger fit when:

• You're doing $2M to $10M a year, below SplitBase's $10M and 3,000-order minimum
• Nobody runs your Google or YouTube Ads yet, and you want the same team that runs your CRO program to run them
• You don't have a developer and want speed and development work included
• You'd rather manage one vendor than coordinate a CRO team with a separate media buyer

How do you decide between SplitBase and Convertibles?

For most brands, two questions settle it: how big you are, and whether you already have people running your ads.

What should you ask both agencies before you sign?

Before you sign with either agency, ask each one these questions. The answers show how the agency really works, beyond the sales deck.

What are the limits of either choice?

Neither agency can promise a specific lift, test without traffic, or fix a product people don't want.

Most tests don't win. SplitBase tells clients to expect clear learnings and early signals of impact within 30 to 60 days, with some tests winning and others producing insights for the next one. Convertibles turns away brands that require a guaranteed lift.

Traffic limits both agencies. SplitBase turns prospects away when traffic or order volume is too low to test. Convertibles says its $2M floor exists because, below it, tests rarely reach significance.

Both agencies publish their own results. Ask each one to walk you through the research and test history behind one published win before you sign.

Each model also has a trade-off. With SplitBase, your CRO team and your media team are separate, so they need to share what's working; SplitBase handles that through a shared Slack channel and weekly calls. With Convertibles, one 8-person team covers both your site and your Google Ads, while Meta, TikTok and email still sit with someone else.

FAQ

What's the main difference between SplitBase and Convertibles?

The main difference between SplitBase and Convertibles is scope. SplitBase is a dedicated CRO and landing page agency for brands doing $10M+ a year, with 7 to 8 specialists per project, and it works alongside your existing media buyer and agencies. Convertibles bundles CRO with speed work, development and Google and YouTube Ads in one retainer, for smaller Shopify brands from $2M a year.

Which is better for Shopify Plus brands?

For established Shopify Plus brands doing $10M+ a year, SplitBase is the stronger fit. It's an official Shopify Plus Partner, most of its clients run on Shopify Plus, and it assigns 7 to 8 specialists to each project. Convertibles fits smaller Shopify brands, from $2M a year, that want Google and YouTube Ads run by the same team.

Does SplitBase work with our existing media buyer and agencies?

Yes. SplitBase regularly works alongside in-house teams and other agencies, with clear roles for each. Your media buyer keeps running campaigns, and SplitBase builds and tests the pages that traffic lands on, sharing results through a shared Slack channel and weekly calls.

How much do SplitBase and Convertibles cost?

SplitBase's full-service CRO programs start at $8,500 a month and run up to about $15,000, with a 3-month minimum, as of October 2026. Convertibles doesn't publish pricing and scopes each retainer to the brand; its FAQ puts mid-market Shopify CRO retainers at $5,000 to $15,000 a month industry-wide.

Does SplitBase work with brands under $10M in revenue?

No. SplitBase works with DTC brands doing $10M+ a year with at least 3,000 orders a month, and its typical client does $20M to $100M. Smaller Shopify brands may be a better fit for Convertibles, which works with brands from $2M.

Does SplitBase run paid ads?

No. SplitBase doesn't run ads. It works alongside your media buyer or ad agency and builds the landing pages your paid traffic lands on, including traffic from Meta.

What kind of tests does SplitBase run?

SplitBase mostly runs A/B tests, usually with 2 to 4 variants, on product pages, landing pages, checkout flows and offers. It runs multivariate tests only when traffic and learning goals justify them. Convertibles also runs A/B tests, usually with 2 to 4 variants.

How does each agency research what to test?

Both agencies combine analytics with qualitative research. SplitBase's research is broader: alongside analytics, heatmaps, surveys and review mining, it runs customer interviews, usability tests and website polls, tracks brand and competitor conversations through its SplitBase Intelligence platform, and studies how customers perceive your brand. Convertibles' site describes analytics, heatmaps, session recordings, surveys and review analysis.

Which agency has run more tests?

SplitBase has run more than 10,000 A/B tests since 2015. Convertibles, founded in 2023, reports 1,200+ tests run.

How fast does each agency launch its first test?

SplitBase usually launches the first test in week two, after setup, tracking checks and early research. Convertibles' homepage says it ships tests in week two, and its onboarding timeline puts the first live test in week three.

Which partners and testing tools does each agency use?

SplitBase is an official Shopify Plus Partner and a partner of Intelligems, VWO, Convert and Heatmap, and it picks a testing tool per site from Intelligems, Shoplift, Visually, VWO, Convert, AB Tasty and Optimizely, plus its proprietary SplitBase Intelligence platform for research. Convertibles is an official Intelligems partner and a Heatmap partner, and tracks programs in its in-house TestBuddy dashboard.

Does SplitBase work on platforms other than Shopify?

Yes. Most SplitBase clients run on Shopify or Shopify Plus, including headless Shopify, and SplitBase also works with WooCommerce, Magento, BigCommerce and Salesforce Commerce Cloud. Convertibles works only on Shopify and Shopify Plus.

Does SplitBase do site speed work?

SplitBase doesn't sell site speed work as a standalone service, but its rebuilds and ongoing CRO improvements can improve speed: Transparent Labs' pagespeed improved by more than 40% after its SplitBase rebuild. Convertibles includes speed work in its retainer.

Does either agency guarantee results or offer performance-based pricing?

Neither guarantees a specific lift. SplitBase doesn't guarantee specific results or offer performance-based pricing, because conversion rates also move with traffic quality, promotions, stock levels and product mix. Convertibles says it isn't the right fit for brands that require a guaranteed lift, and prices its work as a scoped monthly retainer.

Not sure which fits?

Both agencies run A/B testing programs, and both know Shopify Plus. What separates them is whether you want your CRO partner to join the team you've built or to replace part of it.

Related reading

• 7 Best Ecommerce CRO Agencies & Services for DTC Brands (2026)
• The Real Cost of Hiring the Wrong Ecommerce CRO Agency
• How to Choose an A/B Testing Agency
• Why Most Ecommerce A/B Tests Fail, and How Research-First CRO Changes That