Retention Marketing for 7-9 Figure DTC Brands

We grow repeat revenue and LTV through Email, SMS, WhatsApp, and Direct Mail.
Founder-led. Klaviyo-first.

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Results from 100+ partnerships

Most DTC brands don't need more emails, they need better retention decisions. We design CRM systems that protect margins and drive repeat revenue.

+55%

increase in LTV within 12 months

41%

average repurchase rate

27%

average total revenue increase

14x

ROI after just 3 months

We work with some of your favorite brands.

From scale-ups to Fortune 500 companies.

drink&paint

10x

CRM revenue after just one month

View Case Study

femtis

+197%

returning customers

View Case Study

Foot Locker

+18%

loyalty program sign up rate

View Case Study

Heavysaurus

+83%

more orders year over year

View Case Study

SUSHI BIKES

+221%

email marketing revenue

View Case Study

VEDIC LAB

+67%

CAGR through CRM

View Case Study

“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

Not just another email marketing agency, but a retention partner.

Brands send emails. Love brands build systems. Here's the difference:

Psychological Triggers

Customers don't churn because your product fails. They churn because your CRM feels transactional.

‍We design campaigns & flows using behavioral science – scarcity, commitment, identity, effort justification. Every touchpoint is engineered to shift perception from "vendor" to "choice I'm proud of." The result: habits, not transactions.

Deep Financial Analytics

Engagement metrics like open or click rates don't fund payroll. Revenue per contact does.
‍
‍We connect CRM performance directly to P&L and track what CFOs care about – CLV lift by cohort, repurchase rates, contribution margin per segment. You see exactly what drives profit and what wastes budget. Then you kill the losers and scale the winners.

CRM System Architecture

Isolated channels compete for attention. Integrated systems multiply impact.

We build Klaviyo infrastructure that scales – multi-channel orchestration (Email + SMS +WhatsApp + Direct Mail), real-time behavioral segmentation, loyalty programs, subscriptions, full-stack integration. Zero deliverability fires. Zero manual patches. Just systems that print.

Consulting

Growth

Scale

Weekly KPI Check

Strategy Call

Audit & Roadmap

In-House Training

24/7 Support

Master Template

Flow Optimization

+3 Campaigns per Week

A/B Testing

Deliverability Check

Lead Gen & Growth

Customer Insights

Direct Mail Marketing

SMS Marketing

WhatsApp Marketing

Loyalty Program

Referral Program

Subscription Models

App Push

Omni-Channel Strategy

Retention Score

Get Your Free Retention Score

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 strategic retention partner helping DTC brands grow repeat revenue through Email, SMS, WhatsApp, and Direct Mail. Founded by Marc Hiller and Florian Suckfüll, we combine consumer psychology, financial indicators and omnichannel execution to make retention your most profitable growth channel. We work with a maximum of 20 brands at a time. With 10+ years of CRM experience and over 100 brand collaborations, we turn first-time buyers into loyal customers.

Austin, TX & Munich, Germany

+10 years of CRM experience

10,000+ retention campaigns

+100 online shops supported

FAQ

If you have any questions before taking the next step.

Why is retention marketing still relevant in 2026?

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.

Which ESP's and shop-platforms are you specialized in?

The short answer: Klaviyo and Shopify.

From past projects and migrations, we know almost all ESP's and shop-platforms. 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.

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 assessment. You can calculate your Retention Score within 5 minutes or less for free. Here is the link: score.relain.agency/score-en

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.

Insights other agencies charge for

With our Inbox Insights, we send you weekly retention nuggets based on our work with over 100 DTC brands.

Please check your inbox (and your spam folder, just in case) and confirm your email address.

P.S. If you’ve already subscribed to our newsletter, you don’t need to confirm your email address again.

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