Retention Marketing for 8- and 9-Figure DTC Brands
Results from working with 100+ online stores:
We work with some of your favorite brands.
From scale-ups to Fortune 500 companies, we drive maximum customer retention.
Klaviyo Agency for eCommerce Brands
We grow repeat revenue and LTV through Email, SMS, WhatsApp, and Direct Mail.
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drink&paint
CRM revenue after just one month
femtis
returning customers
Foot Locker
loyalty program sign up rate
Heavysaurus
more orders year over year
SUSHI BIKES
email marketing revenue
VEDIC LAB
CAGR through CRM
“RELAIN reviewed all of our CRM, email, and loyalty activities, provided extremely valuable recommendations for optimization, and transferred that knowledge directly to our team.”
Yasemin Mecit
Head of CRM @ SNOCKS
“RELAIN rebuilt our entire email marketing from scratch and generated high revenue for us in the first month.”
Nora Michels
Co-Founder @ drink&paint
“Together with RELAIN, we’re getting the absolute maximum out of our CRM – increasing our email revenue by 221% in just the first month.”
Lisa Willmann
CMO @ SUSHI BIKES
“Our repurchase rate and email marketing revenue have quadrupled since partnering with RELAIN.”
Shivi Gupta
Founder @ VEDIC LAB
"Based on engagement rate, we were able to launch Europe’s most popular Foot Locker loyalty campaign with the help of RELAIN.”
Michiel Roodvoets
Senior Loyalty Marketing Manager @ Foot Locker
Consulting
CRM Mentoring & KPI Reporting
Growth
Full-Service Email Marketing
Scale
Omni-Channel CRM
Weekly KPI Check
Weekly KPI reviews including a written performance report.
Strategy Call
60-minute live session every week – sharing strategies and insights from 100+ e-commerce projects.
Audit & Roadmap
Comprehensive campaign & flow audit with a clear priorities roadmap – from quick wins to full-scale growth.
In-House Training
Workshops and training sessions for your internal team – transferring hands-on CRM & email marketing knowledge into your company.
24/7 Support
Unlimited Slack support for all questions – even on weekends.
Master Template
Conversion-optimized master template (HTML / All-Image / Klaviyo-native).
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Flow Optimization
Creation and continuous optimization of all key flows:
Welcome, Abandoned Browse/Cart/Checkout, Post-Purchase, Win-Back, VIP, Sunset, Replenishment, Back-in-Stock etc.
Welcome, Abandoned Browse/Cart/Checkout, Post-Purchase, Win-Back, VIP, Sunset, Replenishment, Back-in-Stock etc.
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+3 Campaigns per Week
Full service from A to Z: copywriting, design, segmentation, sending – including campaign planning and strategy (sales, content, feedback).
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A/B Testing
A/B test roadmap and execution for subject lines, offers, timing, segmentation, and content.
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Deliverability Check
Deliverability monitoring and ongoing list cleaning for optimal inbox placement.
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Lead Gen & Growth
Popup and embed form creation & optimization to maximize list growth.
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Customer Insights
Post-purchase surveys, feedback campaigns, and automated review flows to gather actionable insights.
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Direct Mail Marketing
Concept and execution of postcard campaigns – integrated into your CRM alongside email flows.
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SMS Marketing
Automations for SMS & RCS – including opt-ins, campaigns, and flows.
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WhatsApp Marketing
Automations for WhatsApp – including opt-ins, campaigns, and flows.
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Loyalty Program
Concept, setup, and full integration of a loyalty program into your CRM ecosystem.
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Referral Program
Referral program including tracking and incentives, with optional expansion into affiliate level.
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Subscription Models
Subscription and replenishment models designed to increase LTV and repeat purchases.
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App Push
iOS and Android push campaigns integrated into your lifecycle marketing.
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Omni-Channel Strategy
Strategic omni-channel roadmap with quarterly OKRs and actionable milestones.
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Free Audit
Discover how much untapped CRM potential your online store really has.
Our Tech Partners
What we stand for
Reliability
We keep our word. Deadlines are met, communication is clear, and precision is non-negotiable. Born in Germany – timing, structure, and reliability are part of our DNA.
Overdelivery
We always go the extra mile. Clients usually doubt our 24/7 support until we’re on a Sunday night call refining their next big retention strategy.
Loyalty
What we create for your customers, we live in our partnerships. 100% commitment. Long-term success only works when both sides grow together.
This is RELAIN
RELAIN is a Klaviyo-first retention agency helping DTC brands grow repeat revenue through Email, SMS, WhatsApp, and Direct Mail. With 10+ years of CRM experience and over 100 brand collaborations, we turn first-time buyers into loyal customers. Founded by Marc Hiller and Florian Suckfüll, RELAIN bridges strategy, creative, and tech to make retention your most profitable growth channel.
Austin, TX & Munich, Germany
+10 years of CRM experience
+100 million emails sent
+100 online shops supported
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FAQ
If you have any questions before you talk to us.
Why is CRM & email marketing still relevant in 2025?
The short answer: Rising CAC.
With acquisition and production costs continuing to increase, brands are shifting their focus toward customer retention. First-time buyers often generate very little or even negative profit. Sustainable and predictable growth is only possible when customers come back. By understanding this and implementing the right retention systems, brands can significantly improve overall profitability.
With acquisition and production costs continuing to increase, brands are shifting their focus toward customer retention. First-time buyers often generate very little or even negative profit. Sustainable and predictable growth is only possible when customers come back. By understanding this and implementing the right retention systems, brands can significantly improve overall profitability.
How do you improve my CRM & email marketing?
The short answer: Turn new and unengaged customers into high-LTV customers.
Through our holistic email marketing approach, we help you increase LTV by boosting repeat purchase rate and average order value. We engage them at the right time, through the right channel, with the best offer. Turning your customers into loyal fans of your brand. We support you from strategy to execution and continuously optimize every step of your customer journey.
Through our holistic email marketing approach, we help you increase LTV by boosting repeat purchase rate and average order value. We engage them at the right time, through the right channel, with the best offer. Turning your customers into loyal fans of your brand. We support you from strategy to execution and continuously optimize every step of your customer journey.
Which tools and e-commerce platforms are you specialized in?
The short answer: Klaviyo and Shopify.
From past projects and migrations, we know tools like Omnisend, Emarsys, and HubSpot, as well as platforms like WooCommerce and Shopware. However, we work most efficiently with a combination of Klaviyo and Shopify, because it offers the best integrations and works seamlessly together. We also partner with tools for WhatsApp and direct mail marketing, loyalty programs, reviews, post-purchase surveys, and attribution analysis.
From past projects and migrations, we know tools like Omnisend, Emarsys, and HubSpot, as well as platforms like WooCommerce and Shopware. However, we work most efficiently with a combination of Klaviyo and Shopify, because it offers the best integrations and works seamlessly together. We also partner with tools for WhatsApp and direct mail marketing, loyalty programs, reviews, post-purchase surveys, and attribution analysis.
What makes you different from other agencies?
The short answer: A holistic approach + 10 years of experience.
At RELAIN, we bring over a decade of CRM experience and deep expertise from working with leading, innovative brands. Our approach covers the entire lifecycle from strategy and concept to hands-on implementation. And it's continuously optimized for your target audience and products.
At RELAIN, we bring over a decade of CRM experience and deep expertise from working with leading, innovative brands. Our approach covers the entire lifecycle from strategy and concept to hands-on implementation. And it's continuously optimized for your target audience and products.
How much does working with you cost?
The short answer: It depends (project-based or retainer with fixed fee / rev-share).
The scope of our work varies based on your brand’s size, customer base, product range, team structure, and existing tools. To give you an accurate estimate, we offer a free CRM audit. You can schedule your call directly on our contact page.
The scope of our work varies based on your brand’s size, customer base, product range, team structure, and existing tools. To give you an accurate estimate, we offer a free CRM audit. You can schedule your call directly on our contact page.
How do you collaborate with in-house teams?
The short answer: Done For You, Done With You, or Consulting Only.
Depending on your company setup, we either work closely with your internal team or operate independently. In most cases, a hybrid approach works best. Our goal is to make your in-house team stronger. We also offer workshops on CRM trends and best practices if you want to level up your team’s expertise.
Depending on your company setup, we either work closely with your internal team or operate independently. In most cases, a hybrid approach works best. Our goal is to make your in-house team stronger. We also offer workshops on CRM trends and best practices if you want to level up your team’s expertise.
Which markets and languages do you support?
The short answer: USA & Germany – English & German.
Our main office is based in Munich, so we’ve always had strong roots in the DACH (Germany, Austria and Switzerland) region. Over the past years, we’ve also run campaigns in the UK, France, Spain, Italy, and the Netherlands. We’ve already worked with several U.S. clients. Our “Made in Germany” CRM and retention marketing approach is fully optimized to drive profitability in the U.S. market.
Our main office is based in Munich, so we’ve always had strong roots in the DACH (Germany, Austria and Switzerland) region. Over the past years, we’ve also run campaigns in the UK, France, Spain, Italy, and the Netherlands. We’ve already worked with several U.S. clients. Our “Made in Germany” CRM and retention marketing approach is fully optimized to drive profitability in the U.S. market.
Insights other agencies charge for
With our “Inbox Insights” newsletter, we send you weekly, business-critical tips based on our work with over 100 online stores.
