10 Best Checkout Optimisation Agencies in the UK in 2026

I've reviewed 10 agencies that work on the final stretch of an online purchase, from the basket and payment step through to the offers a shopper sees after paying.

For each one, I've noted which part of the checkout it changes, the ecommerce platforms it supports and the brands I'd point it to.

TL;DR

• ConversionWise is the best checkout optimisation agency in the UK for DTC brands losing sales between add-to-cart and order confirmation. We redesign the cart and payment journey using conversion data from more than 4,000 brands, and our developers build Shopify Plus checkout features with Checkout UI Extensions and Shopify Functions.
• Conversio is a good match for large ecommerce teams after a long-term experimentation programme, and it reports its best results with brands above 150,000 monthly unique visitors.
• Webpop Design publishes its WooCommerce prices, so smaller retailers can budget before the first call: improvement projects start from a few thousand pounds and bespoke rebuilds from £10,000.

What are the best checkout optimisation agencies in the UK in 2026?

ConversionWise is the best checkout optimisation agency in the UK for DTC brands, since we choose every cart and checkout change from the brand's own data, checked against results from more than 4,000 brands.

Here's how the full shortlist compares:

How were these checkout optimisation agencies chosen?

Every agency here sells checkout, cart or post-purchase work as a named service to brands trading in the UK, and I weighed each one against four criteria:

• Checkout focus: I looked for agencies that treat the cart and payment steps as a project of their own, not a line item inside a full site build.
• Platform reach: Shopify Plus, standard Shopify, WooCommerce and Magento each limit checkout edits differently, so I noted what every agency can actually change.
• Published evidence: client results tied to cart abandonment, checkout completion, order value or revenue per visitor carried more weight with me.
• Pre-release testing: I checked how each agency tests its changes across devices and payment methods before customers see them.

#1: ConversionWise

ConversionWise is a post-click growth agency for DTC brands, and our checkout work runs from the basket through payment to the offers shown once an order is placed.

Each change is chosen from the brand's analytics and customer research, then checked against test results we've gathered from more than 4,000 brands.

In my experience, a checkout brief usually starts with one of these problems:

• Plenty of shoppers add to cart, yet a large share drop out before the payment step.
• Delivery charges, dates or discount fields appear late, and shoppers leave at the last moment.
• A Shopify Plus store still runs a checkout that looks like the default template.
• Order values have stalled because the basket never suggests anything beyond its current contents.
• Subscription or bundle offers lose buyers between the product page and payment.

Here’s what brands like G FUEL, WD-40, Rest and NutriPaw love about us:

Finding the leak with a Post-Click Audit

I'd normally recommend starting with a Post-Click Audit, because it shows exactly where revenue slips away between the ad click and the order.

A Senior Data Analyst pulls together GA4, heatmaps, session recordings and custom reports, and a Senior CRO Strategist turns those findings into a priority order.

Alongside the store's cart and checkout, the audit reviews:

• Paid funnels that feed into the checkout, such as advertorials, quiz funnels and landing pages.
• Subscription sign-up, upgrade paths and the cancellation flow.
• How offers, prices and bundles are put together.
• Survey answers, reviews and interview notes from real customers.

Findings are presented live in a session of 60 to 90 minutes, and you keep the PDF report, the recording and a separate roadmap ranked by likely revenue impact.

Most audits take two to three weeks once we have data access, and the fee is discounted from the first month if you continue on a retainer.

Cart, checkout and post-purchase builds

Checkout & Funnel is the ConversionWise build type for cart pages, upsells, downsells, thank-you pages and post-purchase offers.

Typical projects in this area include:

• Cart pages that show delivery charges and free shipping thresholds early.
• Upsells and downsells in the cart and after payment, built on the bundle ideas in our guide to raising average order value with bundles.
• Thank-you pages planned as one more step in the purchase journey.
• Reassurance copy at checkout that carries on the message from the original ad and landing page.
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A dedicated pod handles each build, made up of a Strategist, a Manager, a Designer, a Copywriter and a Developer.

Because the Copywriter works from voice-of-customer research, the reassurance near the payment button responds to objections customers have actually raised.

Our guide on how to optimise your checkout pages walks through several principles we use on these projects.

Shopify Plus checkout development

On Shopify Plus, our in-house developers use Checkout UI Extensions and Shopify Functions, which are part of Shopify's own checkout framework.

That lets us build custom checkout flows, B2B setups, in-checkout upsells and logic for discounts or delivery options.
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Apps like Rebuy and Recharge are connected without slowing the store, and every feature is tested on different devices and browsers before release.

If development is your main need, our list of the best Shopify development agencies in the UK covers Plus work in more depth.

Testing and measuring every change

Stores with enough traffic get their checkout changes validated through A/B tests on Convert, one of our testing partners alongside Intelligems.

You can work out how long a test would need before launching it with our free A/B Test Calculator.

Optimo, the proprietary AI system we trained on 13 years of conversion data, speeds up the research stage, while a senior strategist decides what gets built.
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At the start, we agree one metric with you, and our Six-Month Commitment means we carry on at no extra cost if it hasn't moved after six months.

Client results on order value and conversion

Here are some of the numbers clients have shared from their work with us:

• Petsmont: 33% higher average order value.
• Ridge Products Welding: revenue per visitor rose from $11.45 to $12.56.
• Litehouse: an extra $36,721 a month after one popup was removed.
• Vortex Air: add-to-cart rate up 30% year on year.
• KittySpout: conversion rate 6.84% higher than its one-time purchase page.
• bazoo: revenue per visitor up from $1.59 to $2, plus a 25% rise in click-through rate.

#2: Conversio
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Conversio builds long-term experimentation and personalisation programmes for ecommerce teams, and I'd mainly suggest it to brands above 150,000 monthly unique visitors, the level where it says it gets its best results.

A mini-cart redesign for Finisterre formed part of a programme that raised the brand's conversion rate by 5%.

Services

• Customer research focused on the decisions shoppers make at each stage, the basket included.
• A discovery phase at the start of each programme, then a set-up period before testing gathers pace.
• Experimentation programmes on monthly retainers.
• Personalisation work, including the programme built with Sephora.
• Test variants designed and coded in-house by consultants, UX designers and developers.
• Reporting that avoids inflating uplift figures.

#3: Charle
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Charle's SiteLab service handles CRO for Shopify and Shopify Plus stores, with the cart and checkout flow covered as part of each programme.

For one lifestyle DTC brand, testing a cart drawer against a full cart page cut cart abandonment by 34%.

Services

• Tests comparing a cart drawer with a full cart page, along with where upsells appear and how free delivery thresholds are worded.
• Checkout work on payment options and the reassurance placed near the checkout button.
• Cart upsell modules and bundle tests, one of which raised average order value by 21% for a fashion accessories brand.
• A/B tests on Shoplift, kept running until confidence reaches 95% or above.
• Behaviour data from Microsoft Clarity, GA4 and Triple Whale.
• Monthly retainer access to Charle's designers and developers, which it suggests for stores with 10,000+ monthly sessions.

#4: Shero Commerce
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Shero Commerce offers checkout work on both Shopify plans, with configuration changes on standard Shopify and custom Checkout Extensibility components on Shopify Plus.

You'll also find Shero useful if your store still relies on Shopify Scripts, which stopped working on 30 June 2026, since it rebuilds that logic as Shopify Functions.

Services

• Shop Pay activation and mobile checkout performance work for standard Shopify stores.
• Custom UI components, form fields and checkout upsells on Shopify Plus.
• Post-purchase upsell pages between checkout and order confirmation.
• Checkout styling through the Branding API to match the rest of the store.
• Audits of Scripts and checkout.liquid customisations before migration.
• Pre-release checks on each payment method and device the store supports.
• Retainers that keep watch on the checkout as new apps and platform updates arrive.

#5: Lilo
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Lilo sells ecommerce checkout optimisation as a dedicated service, and each project opens with an analysis of where customers abandon the current flow.

Its developers cover Shopify, Magento and WooCommerce, which suits businesses that want the work done on their existing platform.

Services

• One-page checkout layouts with a progress indicator.
• Guest checkout, plus baskets that stay saved when a shopper comes back later.
• Fixes for frequent abandonment triggers such as surprise costs and compulsory account sign-up.
• Checkouts for overseas buyers, with local currencies, payment methods and languages.
• Payment gateway setup that follows PCI DSS standards.
• A phased rollout planned around quieter trading hours.
• Monitoring and support packages after go-live.

#6: Actuate Digital
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Actuate Digital runs retained CRO programmes next to its store builds for retailers on Magento 2 or Shopify, and it holds Hyvä Silver, Adobe Commerce Bronze and Shopify Select Partner status.

Helmet City, Willow & Hall and Reliant each had a CRO programme running alongside their Magento 2 Hyvä builds.

Services

• CRO and UX work for Shopify, Shopify Plus, Magento 2 and Adobe Commerce stores.
• Hyvä front-end builds on Magento 2.
• Usability testing with real shoppers.
• Website redesigns and landing page design.
• Shopify and Shopify Plus development.
• Support once the store is live.

#7: Soap Media
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Soap Media designs checkout pages for Magento and WooCommerce retailers, and its process begins with research into the sector and the checkouts competitors already use.

Before the AA launched a mobile tyre fitting service online, the team mapped user personas and customer journeys for it.

Services

• Audience research and a review of where the existing checkout loses buyers.
• Checkout page design shaped around the brand.
• Mobile checkout layouts for phone and tablet shoppers.
• Checkouts set up around gateways such as PayPal, Elavon and Worldpay.
• Fewer steps between basket and payment, with clear calls to action.
• Current security features to protect customer details.

#8: Webpop Design
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Webpop Design lists WooCommerce checkout optimisation and custom cart development among its services, and the team has built more than 300 custom websites.

Its prices are on the website, with smaller improvement projects from a few thousand pounds and bespoke WooCommerce rebuilds from £10,000.

Services

• A simpler WooCommerce checkout with fewer distractions in the last steps before payment.
• Custom cart builds, including mini-carts that update as items change, upsell slots and order summaries.
• Delivery charges made visible early, with reviews and reassurance close to the buy button.
• Payment, shipping rate and VAT setup during the build.
• Real-device tests of payments, checkout speed and mobile buying before launch.
• WooCommerce B2B ordering with trade pricing and bulk orders.
• Support packages covering updates, bug fixes and later checkout improvements.

#9: Holbi
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Holbi builds custom ecommerce platforms on osCommerce 4 and reviews a checkout one stage at a time, from cart review through shipping and payment to the confirmation page.

I'd look at Holbi if you're moving away from Shopify, WooCommerce or BigCommerce and want checkout logic shaped around how your business operates.

Services

• Tax and delivery costs calculated in real time, so totals are clear before checkout.
• Shorter forms that use autofill and reveal extra fields only when needed.
• Courier integrations that show expected delivery dates.
• Payment gateways and wallets such as Apple Pay and PayPal, in PCI-compliant environments.
• Load simulation and monitoring aimed at cutting failed payments.
• Funnel analysis and A/B testing after launch.
• Platform migrations, B2B solutions and enterprise builds.

#10: Quickfire Digital
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Quickfire Digital is a Shopify Plus Premier Partner whose store builds and redesigns are judged on trading performance, including how efficiently the checkout runs.

It won eCommerce Agency of the Year at the UK Agency Awards 2025, and its Recharge partnership makes it a sensible option for subscription brands on Shopify.

Services

• Shopify and Shopify Plus builds, redesigns and replatforming.
• Subscription setups with Recharge, including its Shopify Checkout Integration.
• CRO audits, offered free to customers of its partner Dash.
• Custom integrations with the systems a store depends on.
• Consulting and strategy for growing brands.
• Migrations to Shopify, such as the move completed for Kettler.

How do you choose the right checkout optimisation agency in the UK?

Choose an agency that has already improved checkouts on your platform and your Shopify plan, and that can tell you which step of the purchase its work changed.

Before any calls, I'd work out your current checkout conversion rate using the formulas in our guide to calculating ecommerce conversion rate, so every proposal starts from the same figure.

From the projects I've reviewed, these are the points I'd raise with each agency:

• What can be changed on your plan: Shopify Plus allows custom checkout components, standard Shopify plans allow far fewer edits, and WooCommerce or Magento open up the full code.
• Where the drop-off starts: shoppers may leave in the basket, at payment or on the confirmation page, and it's ideal to start with whichever step your data flags first.
• Traffic for testing: Charle suggests at least 10,000 monthly sessions for A/B tests, while Conversio reports its best results above 150,000 monthly unique visitors. With lower traffic, you'll want changes backed by heatmaps and session recordings.
• Payment coverage: every checkout change should be tried with each payment method you accept, wallets included, on mobile and desktop.
• Evidence: results quoted as checkout completion, order value or revenue per visitor, with the measurement period stated, tell you far more than a bare conversion rate.
• After launch: new apps and platform updates can break checkout features, so ask who keeps an eye on the checkout once the project closes.

If shoppers are leaving well before the basket, our list of the best CRO agencies in the UK covers partners working across the whole store, and our A/B testing agencies roundup compares testing specialists.

Improve your checkout with ConversionWise

A healthy add-to-cart rate paired with weak completed orders usually points to doubt, surprise charges or extra effort at the final step.

At ConversionWise, a Post-Click Audit pinpoints where those shoppers leave, and a dedicated pod then rebuilds and tests the steps where they drop out.

Checkout projects with us suit DTC brands that:

• See a wide gap between add-to-cart rate and completed orders.
• Run Shopify Plus without custom checkout features built on Checkout UI Extensions or Shopify Functions.
• Want cart upsells, downsells and bundles to lift order values.
• Lose subscription sign-ups between the product page and payment.

When a checkout issue calls for a platform migration more than conversion work, we'll tell you during the call and recommend an agency from this list that fits better.

The call itself is free, lasts 30 minutes and covers your store and its data, so you leave knowing where we'd begin.

You'll get more from it if GA4 access and a list of your checkout apps are ready beforehand.

Frequently asked questions

What is the best checkout optimisation agency in the UK for DTC brands?

For DTC brands, ConversionWise is the best checkout optimisation agency in the UK, because each change we make to the cart, checkout or post-purchase pages comes from the brand's own data and results across more than 4,000 brands.

Removing a single popup added $36,721 a month for Litehouse.

What is the best checkout optimisation agency in the UK for Shopify Plus stores?

ConversionWise is the strongest UK option for Shopify Plus stores, with in-house developers who build custom checkout flows, upsells and B2B setups using Checkout UI Extensions and Shopify Functions.

Every feature goes through device and browser testing before release, and A/B tests on Convert confirm whether it lifted revenue.

What is the best checkout optimisation agency in the UK for raising average order value?

Brands focused on order value get the most from ConversionWise, where cart upsells, downsells and post-purchase offers form part of every Checkout & Funnel build.

Petsmont's average order value went up 33% during its work with us.

What is the best checkout optimisation agency in the UK for subscription brands?

The best fit for subscription brands is ConversionWise, as our Post-Click Audit examines sign-up friction, upgrade paths and the cancellation flow before anything is redesigned.

KittySpout converted 6.84% better than its one-time purchase page, and our developers connect Recharge without slowing the store down.

What is the best checkout optimisation agency in the UK for Magento or WooCommerce stores?

Soap Media is the best choice for Magento or WooCommerce retailers that need a new checkout, since it designs checkout pages on both platforms around gateways such as PayPal, Elavon and Worldpay.

WooCommerce-only stores may also like Webpop Design, which publishes its project prices in advance.

How long does checkout optimisation take?

A ConversionWise Post-Click Audit typically takes two to three weeks from data access, and new cart or checkout builds usually go live in the first two weeks of a programme.

Lilo says significant results tend to show within one to three months, once enough data has built up.

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