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Klaviyo Email Marketing Agency
for Ecommerce Brands.

​We help Shopify ecommerce brands using Klaviyo increase revenue through smart, data-led email marketing that drives sales, retention, and repeat purchases.

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about us

Stop chasing new customers.
Start keeping them. 

 

In today's world the greatest challenge is not only to gain attention but to retain it.

Paid ads are getting more expensive. Competition is tougher. That’s why the fastest-growing ecommerce brands win through retention, not just acquisition​. At Retention Lab, we build Klaviyo email systems that bring customers back again and again. Fully connected to your Shopify data. Fully focused on revenue.

   ⚡ Launch Your Email Strategy From £299

Sale Branding

How we work with ecommerce brands:

01

Audit

We analyse your customers, products, and buying behaviour before making any decisions.

02

Full-funnel Klaviyo Flows

From welcome to post-purchase to win-back, every flow is designed with one goal in mind: drive sales.  No disconnected emails. Just a clear revenue journey.

03

Continuos Optimization

We test, improve, and iterate every month — no “set and forget”.

What we do

What We Do:

Performance Reporting

Track open rates, clicks, revenue, and more. Get clear insights to boost your strategy and ROI.

Smart Segmentation

We use Shopify and Klaviyo data to send the right message to the right customer at the right time.  More relevance = higher LTV.

Email Automation Setup

Automate your customer journey with powerful flows like welcome emails, cart recovery, and win-back campaigns.​

Professional Email Design

We create responsive, on-brand emails that look great on any device and drive action—perfect for launches, promos, and nurturing.

​​

A/B Testing & Optimization

We test subject lines, content, and timing to maximize performance and continuously improve results.

High-Converting Copy

Persuasive, on-brand email copy that gets opened, read, and clicked—whether for a launch, sale, or retention.

No big offices. No middlemen.
Just lean, efficient email marketing.

Work directly with a specialist, not an admin team.
Perfect for small ecommerce brands looking for affordable email marketing.

Mark T.
Marketing Manager VSoft

From strategy to execution, their team handled everything seamlessly. Their detailed reporting helped us understand what was working and where to improve. The A/B testing they implemented increased our revenue from email by 25% in just three months

Real Results That Speak for Themselves

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Driving Consistent Revenue Through Email Marketing

For this eCommerce brand, email marketing became a major revenue driver, generating $86.4K in email revenue and accounting for 86.6% of attributed revenue.

💰 $142.6K total revenue generated
📈 $99.8K attributed revenue — 70% of total revenue
📩 $86.4K generated through email — 86.6% of attributed revenue
🎯 $14.52 revenue per recipient

Flows & campaigns driving consistent results:

🔄 $64.8K from automated flows — 64.9% of attributed revenue
📣 $35.1K from campaigns — 35.1% of attributed revenue

Frequently asked questions

You don't need an agency.

You need a partner

Send us a message and we will get back to you as soon as we can :)

Contact us

Monthly Revenue
£0- £50K
£50K- £200K
£200K- £500K
£500K- £2M
£2M+

© 2026  All rights reserved. Retention Lab, Ecommerce Email Growth Specialists. London, United Kingdom

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