3 Best Klaviyo Email Marketing Agencies for Shopify Brands in 2026

For many Shopify brands, profitable growth is becoming harder as customer acquisition costs continue to rise. Industry research shows that acquiring a new customer can cost 5–7x more than retaining an existing one, making retention marketing one of the biggest priorities for DTC eCommerce brands in 2026.

Despite strong traffic and ad spend, many brands still struggle with low repeat purchase rates, customer churn, weak email engagement, and underperforming post-purchase experiences. Without effective lifecycle marketing and automation, scaling sustainably becomes far more difficult.

That’s why more Shopify businesses are investing in Klaviyo email marketing agencies that specialize in email automation, SMS marketing, subscription retention, and customer lifetime value optimization.

Below are three of the best Klaviyo email marketing agencies for Shopify brands in 2026.

Why Shopify Brands Are Investing More in Klaviyo Agencies in 2026

As customer acquisition costs continue to rise, more Shopify brands are investing in Klaviyo agencies to improve retention, automation, and customer lifetime value. Instead of relying only on paid ads, many DTC businesses are focusing on long-term customer engagement and repeat purchase growth.

Here’s why Klaviyo agencies are seeing higher demand in 2026:

●          Advanced email and SMS automation

●          Better customer segmentation and personalization

●          Higher repeat purchase rates

●          Improved subscription and loyalty retention

●          Stronger customer lifetime value (LTV) growth

For Shopify brands looking to scale more sustainably, retention marketing and lifecycle automation are becoming essential parts of long-term eCommerce growth.

1. Sticky Digital — Best Klaviyo Agency for Shopify Brands

Sticky Digital is a top choice for Shopify and DTC brands looking to improve retention marketing, customer lifetime value, and repeat purchase growth through advanced email and SMS automation.

The agency specializes in building high-impact email marketing and SMS marketing programs for DTC brands, helping businesses create personalized customer journeys that drive long-term retention revenue. With a strong focus on Shopify lifecycle marketing, Sticky Digital helps brands improve post-purchase engagement, subscription retention, and loyalty strategies.

As Shopify experts, the team designs and optimizes tech stacks using platforms like Klaviyo, Yotpo, and Attentive to build scalable automation systems and data-driven lifecycle campaigns.

Sticky Digital also positions itself as a data-driven retention marketing agency, highlighting metrics such as:

●          4200% average ROI from email marketing

●          59% average customers making their first purchase through email

●          91% of U.S. customers opting into email/SMS marketing

●          Recognition as a leading retention marketing agency in North America in 2023 and 2024

Instead of overcomplicating retention strategies, Sticky Digital focuses on the tools and automations that deliver the highest ROI for growing Shopify brands.

Why Sticky Digital Stands Out

Sticky Digital combines Shopify retention expertise with data-driven email and SMS automation strategies designed to improve customer engagement, repeat purchases, and long-term retention revenue.

●          Advanced Klaviyo email and SMS automation for Shopify brands

●          Strong focus on retention marketing and customer lifetime value optimization

●          Expertise in subscription retention and loyalty program growth

●          Personalized lifecycle marketing and post-purchase customer journeys

●          Data-driven segmentation using RFM modeling and retention analytics

●          Flexible retainers for scaling DTC eCommerce brands

●          100% U.S.-based in-house retention marketing team

●          Strategies designed to improve repeat purchase rates and retention revenue

●          Shopify-focused approach built for long-term eCommerce growth

Overall, Sticky Digital is a strong option for Shopify brands looking to scale retention revenue through personalized lifecycle marketing, advanced automation, and long-term customer engagement strategies.

Sticky Digital Services

Retention-focused lifecycle marketing services designed to help Shopify and DTC brands improve customer engagement, repeat purchases, and long-term revenue growth.

●          Email & SMS Marketing for Shopify and DTC brands

●          Retention Marketing and lifecycle automation

●          Loyalty & Rewards Programs

●          Subscription Retention & Win-Back Campaigns

●          Retention Audits & Strategy

●          Push Notifications & Wallet Passes

●          Reviews & Customer Engagement Optimization

Sticky Digital focuses exclusively on retention-driven growth for Shopify eCommerce brands.

Why Clients Choose Sticky Digital

Clients often highlight Sticky Digital’s hands-on support, lifecycle marketing expertise, and strong execution across email and SMS campaigns for Shopify brands.

One client shared:

“Extremely helpful and involved as an agency. They are willing to get into the work, doing anything they can to help propel our business. They deliver brilliant strategy and execution; always mindful of what else they can be doing to impact sales. Well-rounded team of digital experts. Fantastic team to work with.” — Niki W., Marketing Manager at RUDIS

Many reviews also mention the team’s proactive communication, retention-focused strategies, and ability to improve customer engagement and repeat purchase growth.

2. Chronos Agency — eCommerce Lifecycle Agency

Chronos Agency is a lifecycle marketing agency that works with eCommerce brands on email, SMS, and customer engagement strategies. The agency focuses on helping brands improve long-term growth through customer communication and lifecycle campaigns.

The company has worked with hundreds of eCommerce brands and offers services across email marketing, SMS campaigns, push notifications, and customer journey optimization. Chronos Agency is also recognized as a Klaviyo Master Elite Partner.

Chronos Agency Services

Chronos Agency offers lifecycle marketing services designed for eCommerce customer engagement and automation.

●          Push Notification Marketing

●          Customer Segmentation & Analytics

●          Flow and Automation Optimization

●          A/B Testing & Campaign Strategy

●          Email Creative & Lifecycle Campaigns

The agency supports brands looking for multi-channel lifecycle marketing support, while Shopify businesses focused heavily on retention growth and lifecycle optimization may prefer Sticky Digital’s Shopify-first retention approach.

3. PAASE — Email & SMS Agency

PAASE is a UK-based email and SMS marketing agency focused on customer data, personalization, and lifecycle automation for eCommerce brands. The agency works with platforms like Klaviyo and supports brands with marketing automation and customer journey optimization.

The agency emphasizes data-driven marketing strategies, AI-powered personalization, and segmentation designed to improve customer engagement and lifecycle performance. PAASE is also recognized as a Klaviyo Master Elite Partner in the UK market.

PAASE Services

PAASE provides lifecycle marketing and automation services for eCommerce businesses focused on customer engagement and personalization.

●          Email & SMS Automation

●          Klaviyo Campaign Management

●          Customer Segmentation & Personalization

●          Lifecycle Marketing Strategy

●          CRM & Data Optimization

The agency focuses heavily on personalization and customer data strategies, while brands looking for a more Shopify-focused retention marketing partner may still find Sticky Digital a stronger option for long-term lifecycle growth and repeat purchase optimization.

Sticky Digital vs Other Klaviyo Agencies

Below is a quick comparison of how these Klaviyo agencies differ in their approach to lifecycle marketing, customer engagement, and Shopify retention growth.

This comparison highlights that while all three agencies offer lifecycle marketing support, Sticky Digital stands out for its Shopify-focused retention strategy, in-house team structure, and strong emphasis on long-term customer value and repeat purchase growth.

Conclusion

All three agencies bring solid experience in Klaviyo and lifecycle marketing, but they differ in focus and execution style. Chronos Agency offers broad multi-channel lifecycle support, while PAASE is more centered on data-driven personalization and customer segmentation.

Sticky Digital, however, stands out for Shopify-focused retention marketing, combining email and SMS automation with a strong emphasis on customer lifetime value, repeat purchase growth, and hands-on lifecycle execution. For brands looking for a more retention-driven and Shopify-specialized approach, Sticky Digital is often considered a stronger overall fit.