Meet the Klaviyo Email Marketing Agency Behind Smarter Retention

We help D2C brands turn casual buyers into lifelong customers through retention-focused email marketing.
As a Klaviyo Platinum Master Partner agency with over a decade of eCommerce experience, we can unlock your brand’s full potential and drive sustainable, long-term revenue.

LET'S TALK

Four people dressed in colorful, whimsical costumes standing in front of a cosmic galaxy backdrop, with props like a telescope, a large glowing orb, and headpieces resembling a sun's rays and feathers.

We’re a diverse boutique agency of Klaviyo experts and a trusted Klaviyo platinum master partner.

Our remote team brings together email strategists, CRM specialists, copywriters, designers and retention experts across different markets and time zones, offering senior, channel-specific support.

Our work doesn't rely on templates. Every strategy is built around your brand, your data and your goals.

We work with leading ecommerce platforms including Shopify and Shopify Plus to help build stronger retention programmes through Klaviyo.

For our clients, that means specialist email marketing, SMS and lifecycle strategy from a boutique team that understands how D2C and ecommerce brands grow across regions.

Small by design, think of us as an extension of your team, here to focus on what matters most: keeping customers coming back.

SEE OUR WORK

Why work with a Klaviyo partner agency?

A woman smiling and looking at her phone, with a large smartphone screen showing a fashion outfit and business analytics, including revenue and performance metrics.

Retention that scales

Working with a specialist Klaviyo email marketing agency means your retention programme is managed strategically rather than reactively.

We manage your entire retention lifecycle - automations, campaigns, planning, and optimisations - so you can focus on running your brand. Our email and SMS strategies integrate seamlessly with your tech stack to create engaging, segmented and revenue-focused customer journeys. Whether through subscriptions, loyalty programmes, or beyond, we create the systems that keep customers coming back.

Measurable growth

Our work is built on impact. We design strategies around your KPIs. On average, eCommerce brands attribute 20–25% of revenue to email marketing. After working with us, many of our clients see up to 50% of their revenue come from email and SMS. That’s measurable growth you can track in higher ROI, stronger conversions, increased customer lifetime value, more repeat purchases and reduced churn.

Built on trust

We keep you informed with transparent reporting and open communication, so you can make confident, informed decisions throughout our partnership. But we don’t stop there. We’re always looking for new ways to grow your brand, uncovering untapped opportunities and pulling the right levers that drive sales. We’re as committed to your long-term growth as you.

We’ve spent years perfecting our approach,
and our results speak for themselves.

REFY

"We have been working with Melusine Studio for over a year now and could not be happier with the relationship we have built. Melusine Studio have supported us from both a creative and technical perspective, to help to bring our CRM strategy to life. The team are incredibly professional, knowledgeable, proactive in approach and a pleasure to work with. Together we have delivered on a number of key projects, contributing to channel performance and overall growth. We look forward to continuing to improve and optimise alongside Melusine and the team.''
Faye Lindfield, Senior CRM/CX Manager | REFY
Daniel Wellington

"We started working with Melusine Studio after their audit of our Klaviyo account. They came with smart, data-driven ideas to improve our CRM — based on analytics and experience with other brands, and we quickly decided to bring them on board. Since then, the collaboration has been smooth and efficient. The team is responsive, always on time, and great at adapting to our specific setup. From journey strategy to copy and visuals for emails and SMS, they consistently deliver quality work. I’d recommend Melusine Studio to any brand looking for a reliable and strategic Klaviyo partner who brings both structure and creativity to the table."
Julia Shamsutdinova, CRM Manager | Daniel Wellington
Grown Alchemist

"We got Melusine Studio on board with a clear objective and in a matter of months, they helped us achieve it. Our CRM channel has significantly improved most of it's metrics during this time. From a technical point of view, the team is very strong and didn’t just meet expectations with existing challenges and asks, but brought new opportunities to the table. We also partnered with them on a creative and strategic point of view and they showed up as experts in the field. It's a pleasure to work with Melusine and their team, I see them as partners and would thoroughly recommend working with them."
Maddy Booker-Price, Global Digital Director | Grown Alchemist
Gigi & Olive

“Working with Melusine Studio has been an absolute pleasure. Their team is not only incredibly professional but also approachable and easy to collaborate with, making the entire process seamless and stress-free. They truly understand the nuances of email marketing, delivering creative and effective campaigns tailored to our brand. The results speak for themselves, and we couldn't be happier with their expertise and support.”
Georgie Le Roux, Founder | Gigi & Olive
Fitizen

“I’ve worked with countless partners over the years, from ads agencies, email marketing agencies, branding, tax consultants, you name it. Melusine Studio has been one of the best partners I’ve ever worked with. Their planning and management of our account is ultra professional. They are constantly measuring, improving, and optimising our Klaviyo account. When things get busy, they stay on top of everything and will always check up if there’s pending to ensure progress stays on schedule. It’s rare to work with people who do great work on time and are awesome to work with. But Mélusine and her team manage all three. I would wholeheartedly recommend them to anyone trying to make the most of their emails.”
Tom Eastman, Founder | Fitizen
ninepine

“Mélusine Studio has completely transformed our email game. Not only by creating great newsletters and flows but in being a business partner that genuinely cares about how we perform. We brainstorm ideas with the team and tailor our approach together to best plan for our particular business model and drive the best possible results. For us, they aren't just an agency - we consider them part of our team!”
Kousha Torabi, Co-founder | ninepine
Detail Library

“Melusine Studio were fantastic to work with on our Klaviyo project. They quickly understood our goals and helped us streamline our email marketing setup with clarity and care. Organised, proactive, and a genuine pleasure to work with, they made the whole process simple and effective. We couldn’t recommend them enough!”
Axelle Fox, Digital Marketer | Detail Library
Fable & Mane

“We have been working with Melusine Studio for over a year and we couldn’t be happier. The Studio has not only transformed the look and design of our emails to fully translate our brand identity, they have supported us from a technical perspective to fully maximise the potential of our CRM strategy. KPIs across the board have improved significantly and we look forward to working with them as a key partner for long-term business growth.”
Alice Frost, Global Digital Director | Fable & Mane
Global Tea Hut

"It has been a wonderful experience working with Mélusine Studio to improve our email marketing and create a more meaningful experience for our customers, fostering a sense of community and connection with each email. There is a collaborative spirit to working with Mélusine Studio that aligns well with our mission and goals. I would highly recommend them to anyone who is looking for more than just another email marketing agency, but something that will become an integrated part of what is offered to your customers and community."
Connor Goss, Marketing Director | Global Tea Hut
Real Science Athletics

"Melusine Studio are a breath of fresh air. They’ve helped us increase turnover by +45% in the last year by building out a number of automated flows and 8 campaigns per month. They’re true professionals and great to work with. It’s been a very hands off process which is extremely helpful as my team and I are busy working on other areas of the business. Every month they find new ways of optimising the emails, pop-ups and other areas of our Klaviyo account. I feel confident they’re always squeezing everything they can out of this side of the business. Thank you Mélusine, Plamen and the team for all of your help."
Sean Nalewanyj, Founder | Real Science Athletics