Shopify Checkout Optimization Agency
CONVERTIBLES runs Shopify checkout optimization for $2M+ DTC brands that are losing revenue between the cart and the confirmation page. Most stores spend heavily to fill the cart, then leak the majority of that intent at the cart drawer, the cart-to-checkout handoff, and the checkout itself. We A/B test the full path: cart drawer, cart page, cart-to-checkout flow, Shopify Plus checkout, and post-purchase, then ship the winners.
Last reviewed May 2026 by Julian Samarjiev, Co-founder of Convertibles. Methodology validated across 1,000+ live A/B tests on $2M+ DTC Shopify brands including Jones Road Beauty, Performance Golf, and Gymreapers. Tools of record: Intelligems (official partner) and TestBuddy. Abandonment benchmarks per Baymard Institute.
What is Shopify checkout optimization?
Shopify checkout optimization is the practice of A/B testing and improving every step a shopper takes from adding to cart through to a completed order: the cart drawer, the cart page, the cart-to-checkout handoff, the checkout itself, and post-purchase. The goal is to recover the revenue that is already in the funnel rather than buying more traffic. Industry abandonment sits around 70% (Baymard Institute), so the checkout path is usually the single largest pool of recoverable revenue on a Shopify store.
CONVERTIBLES runs checkout optimization as part of a full Shopify CRO program. The same team owns A/B testing, development, design, and speed, so a winning cart or checkout test does not die in a report or a dev backlog. We find the leak, build the test, ship the winner to 100% of traffic, and feed the learning into the rest of the funnel.
At a Glance
- Who we work with: Shopify Plus DTC brands doing $2M+ in annual revenue with enough checkout traffic to run statistically valid tests
- What we optimize: Cart drawer, cart page, cart-to-checkout handoff, Shopify Plus checkout (via checkout extensibility), and post-purchase upsells
- What we test: Free-gift and free-shipping progress cues, trust signals, savings math, express payment placement, upsells, form friction, discount-field behavior, and checkout copy
- How we measure success: Revenue per visitor, completed orders, AOV, and year over year revenue growth, not just a higher checkout-completion rate in isolation
- Documented proof: +$50,099/month from a cart drawer free gift progress cue and +$32,605/month from trust signals plus savings math in the cart drawer
- Trusted by: Jones Road Beauty ($160M+), Performance Golf (9 figure), Gymreapers, and DTC brands across beauty, supplements, apparel, and consumables
Why Checkout Optimization Is Different
The checkout path is the highest-intent, lowest-margin-for-error part of the funnel. A visitor who has added to cart has already done the hard part. Everything after that is friction management: are they confident in the total, the shipping, the return policy, and the security of the payment? Small changes to those moments move completed orders directly, and the traffic is already paid for, so the revenue is incremental rather than acquired.
It is also the part of Shopify with the most platform-specific constraints. The cart drawer and cart page are theme-level and fully testable. The checkout itself is locked down on standard Shopify and only customizable on Shopify Plus through checkout extensibility (Shopify Functions, UI extensions, and branding APIs). That is why checkout optimization is mostly cart and cart-to-checkout work for most brands, with true checkout-page testing available to Plus merchants. Knowing exactly where the platform lets you test, and where it does not, is half the job.
What's Included in the Checkout Optimization Program
Cart Drawer and Cart Page Testing
The cart drawer is where most checkout revenue is won or lost, because it is the moment a shopper decides whether to proceed. We test free-gift and free-shipping progress cues, trust signals, savings and discount math, quantity and upsell modules, and the prominence and copy of the checkout button. A cart drawer free gift progress cue generated +$50,099/month for one brand. A separate test adding trust signals and savings math to the cart drawer delivered +$32,605/month.
Cart-to-Checkout Handoff
The moment between cart and checkout is a common drop point: shoppers lose confidence, get surprised by shipping, or hesitate at an unexpected total. We test express-payment placement (Shop Pay, Apple Pay, Google Pay), shipping and total transparency before the jump, and the friction of the handoff itself, so the intent built in the cart survives into checkout.
Shopify Plus Checkout Extensibility
For Shopify Plus brands, the checkout itself is testable through checkout extensibility. We work with Shopify Functions, checkout UI extensions, and branding APIs to test trust badges, post-purchase upsells, shipping and delivery messaging, discount-field behavior, and form-field reduction, all inside Shopify's supported, upgrade-safe framework rather than the deprecated checkout.liquid.
Post-Purchase and Confirmation
The order-confirmation step is underused revenue real estate. We test post-purchase upsells and one-click offers that lift AOV without adding friction to the original purchase decision, because the conversion has already happened and the buyer's payment details are already captured.
Speed and Theme Development
A slow cart or checkout abandons buyers regardless of how good the UX is. We work inside the theme to keep the cart drawer, cart page, and checkout fast, and we audit every change for tracking and app impact before shipping, so analytics, pixels, and subscription or upsell apps keep working.
How We Work: The Engineer Growth Method
- Find the Money. Audit cart and checkout analytics, funnel drop-off by step, device split, app setup, and speed. Rank opportunities by recoverable revenue.
- Build and Test. Design, develop, and launch cart, cart-to-checkout, and checkout experiments. We build the tests ourselves, so execution does not stall in a dev queue.
- Scale What Works. Ship winners to 100% of traffic, roll insights across the funnel, and compound recovered checkout revenue month over month.
Proof
Cart Drawer Free Gift Progress Cue (+$50,099/month)
A brand was leaking cart-stage revenue. We tested a free gift progress cue in the cart drawer that showed shoppers how close they were to unlocking a gift, nudging basket size and completion. The winning variant added $50,099/month. Read the case study.
Cart Drawer Trust Signals + Savings Math (+$32,605/month)
For another brand, the cart drawer was not reassuring shoppers at the decision moment. We tested added trust signals and explicit savings math so the value and security of the order were clear before checkout. The winning version generated $32,605/month, a roughly 15% lift. Read the case study.
Jones Road Beauty ($160M+)
CEO Cody Plofker publicly endorsed CONVERTIBLES on X/Twitter: "I'm a very happy client. They have a unique testing methodology." See the post.
Results at Scale
Across the full client portfolio, CONVERTIBLES has 36 published A/B test case studies, 1,000+ tests run, and $2.3M+/month in aggregate documented lift. Cart and checkout tests sit inside that broader testing system. Browse all published Shopify A/B test case studies.
Our Tools
Intelligems (Official Partner)
Intelligems is our primary testing platform for Shopify. We use it for A/B testing, multi-variation testing, and profit optimization across cart, checkout, and the rest of the funnel.
TestBuddy (Proprietary)
TestBuddy is our in-house program management tool for visualizing live tests, variants, and performance. Clients can see what is running, what changed, and how each experience is performing without chasing spreadsheets.
Checkout Optimization Is Part of the Full CRO Program
Checkout optimization does not work in isolation. Cart tests affect ad economics. Speed affects every step. App implementation affects measurement. That is why this service is part of our broader Shopify CRO agency program, not a one-off checkout audit. If you want to attack the abandonment problem with content as well, see our guide on how to reduce shopping cart abandonment. To benchmark your conversion rate against your industry first, run your numbers through our free CVR benchmark calculator.
Who This Is For
- Shopify Plus DTC brands doing $2M+/year in revenue
- Brands with high add-to-cart rates but heavy cart and checkout abandonment
- Teams spending $50K+/month on paid acquisition and needing more of that traffic to complete checkout
- Founders, CMOs, and growth leads who care about revenue per visitor and completed orders, not just top-of-funnel conversion
- Brands ready for one team across CRO, dev, and speed
Who This Is Not For
- Stores without enough checkout traffic to run valid tests
- Brands under $2M/year in revenue
- Brands on platforms other than Shopify or Shopify Plus
- Teams wanting a one-off checkout redesign without ongoing testing
- Teams seeking guaranteed lift or fixed-scope dev work disconnected from revenue measurement
Frequently Asked Questions
What is Shopify checkout optimization?
Shopify checkout optimization is A/B testing and improving every step from add-to-cart through completed order: the cart drawer, cart page, cart-to-checkout handoff, the checkout, and post-purchase. Because checkout abandonment averages around 70% (Baymard Institute), this path is usually the largest pool of recoverable revenue on a Shopify store, and the revenue is incremental because the traffic is already paid for.
Can you A/B test the Shopify checkout page?
On Shopify Plus, yes, through checkout extensibility (Shopify Functions, checkout UI extensions, and branding APIs). On standard Shopify, the checkout itself is locked down, so the testable surface is the cart drawer, cart page, and cart-to-checkout handoff. For most brands the biggest checkout wins live in the cart stage regardless, because that is where the proceed-or-abandon decision is made.
What's the difference between cart optimization and checkout optimization?
They are adjacent steps in the same path. Cart optimization covers the cart drawer and cart page, where shoppers decide whether to proceed. Checkout optimization covers the checkout flow itself, where they complete payment and shipping. We treat them as one program because a win in the cart that does not survive the checkout handoff is not a real win. Both are measured on completed orders and revenue per visitor.
Do you need Shopify Plus to optimize checkout?
You need Shopify Plus to customize and test the checkout page itself, because checkout extensibility is a Plus feature. The cart drawer, cart page, and cart-to-checkout handoff are testable on any Shopify plan. We work with $2M+ DTC brands, who are typically on Plus, so the full checkout surface is usually available.
What checkout elements do you test?
Free-gift and free-shipping progress cues, trust signals, savings and discount math, express-payment placement (Shop Pay, Apple Pay, Google Pay), upsell and quantity modules, checkout-button prominence and copy, shipping and total transparency, form-field reduction, discount-field behavior, and post-purchase upsells. We prioritize by recoverable revenue, not by what is easiest to change.
How much can checkout optimization lift revenue?
It depends on traffic, current abandonment, and AOV, but the wins are often large because the traffic is already paid for. Two documented examples from our case studies: a cart drawer free gift progress cue added $50,099/month, and a cart drawer trust signals and savings test added $32,605/month. We size the opportunity against your funnel data before committing to a test plan.
Will checkout changes break my apps or tracking?
No. We audit every change for tracking and app impact before shipping, and on Plus we work inside Shopify's supported checkout extensibility framework rather than the deprecated checkout.liquid. Analytics, ad pixels, reviews, subscriptions, and upsell apps all keep working. Breaking measurement to post a better completion rate is not a real win.
Book a Strategy Call
If you run a Shopify Plus brand doing $2M+/year and want one team to recover the revenue leaking between your cart and your confirmation page, let's talk.