8 Best Klaviyo Agencies for Ecommerce Brands in 2026

Klaviyo is one of the most powerful tools an ecommerce brand can use to improve revenue. But the platform is only as good as the strategy behind it. 

Plenty of brands have Klaviyo set up and running, with flows turned on and campaigns going out regularly, yet they still wonder why their email and SMS revenue doesn’t meet their expectation.

If you find yourself in this category, it’s time to get the best Klaviyo agency for your brand.

In this article, we’ll show you what a Klaviyo agency does, what separates the good ones from the rest, and how to choose the right partner for your brand.

What Does a Klaviyo Agency Do?

A Klaviyo agency manages your email and SMS marketing strategy, setup, and execution on the Klaviyo platform. 

Depending on the scope of work, that can mean:

• Building your flows from scratch

• Designing and writing your campaigns

• Managing your list segmentation

• Running A/B tests

• Reporting on performance

• Continuously optimizing everything to drive more revenue.

For ecommerce brands, your email and SMS channels should be generating 20% to 40% of your total revenue. If they are not, something is wrong with your Klaviyo setup. A good agency will find the problem and solve it.

Here is what the best Klaviyo email marketing agencies will handle:

• Strategy and planning: Building a full email and SMS marketing calendar, identifying which flows are missing or underperforming, and developing a roadmap for growing owned revenue over time

• Klaviyo account setup: For brands new to the platform, a proper Klaviyo account setup lets you integrate with your ecommerce store, configure tracking, set up sending domains, warm your list, and build the foundational flows before a single campaign goes out. Without this, a poor setup will lead to deliverability problems, missed revenue, and data you cannot trust

• Flow building and optimization: Welcome series, abandoned cart, browse abandonment, post-purchase, win-back, sunset. These automated flows are where consistent owned revenue comes from. A Klaviyo agency builds them properly and keeps improving them based on performance data

• Email marketing campaign management: Writing, designing, and sending regular campaigns to the right segments at the right time. With Klaviyo consulting for ecommerce brands, you’ll send the right message to the right person at the right moment

• Targeted SMS marketing: SMS is a high-engagement channel, but it carries more risk than email if it is not managed carefully. A good Klaviyo agency builds targeted SMS marketing programmes that are relevant, well-timed, and clearly separate from your email flows so the two channels complement each other rather than compete

• Hire Klaviyo email designers for ecommerce: Most agencies include email design as part of their service. Poorly designed emails kill click rates. Emails that do not load correctly on mobile are even worse

They also handle reporting and metrics tracking, including placed order rate, revenue per recipient, repeat purchase rate, and list health.

Why Ecommerce Brands Need the Best Klaviyo Agency

Ecommerce email marketing has specific dynamics that a general digital marketing agency will not fully understand. 

• Seasonal buying cycles
• Product replenishment timing
• Abandoned cart recovery
• Post-purchase upsell sequences
• Loyalty and VIP communication

These are not generic email marketing problems. They require someone who has built these systems before and knows how they work.

The best Klaviyo email marketing agency for an ecommerce brand will understand how to build flows that account for purchase behaviour, how to segment a list in ways that improve deliverability and conversion at the same time, and how to write and design emails that feel relevant and personal rather than promotional and generic.

They will also understand the platform itself. 

Klaviyo has a lot of power that most brands never use, from its predictive analytics and CLV data to its conditional splits, smart sending features, and integration capabilities. 

For DTC brands in particular, email and SMS are the most cost-effective channels. Unlike paid advertising, every dollar you invest in building a better Klaviyo setup pays off over and over again every time a flow is launched or a campaign goes out. 

8 Best Klaviyo Agencies for Ecommerce Brands in 2026

1. Pro Marketer (Best Klaviyo Agency)

Best for: DTC and ecommerce brands looking for a certified Klaviyo partner with a proven track record in email and SMS revenue growth

Pro Marketer is a Toronto-based ecommerce growth agency and certified Klaviyo partner that has sent over 180 million emails and generated $72 million in revenue for its clients. 

They work with brands across apparel, supplements, cosmetics, and more, and their email and SMS results speak for themselves: 

• One client went from $0 to $50K in email revenue in a single month

• Another achieved 2,951% ROI in five months

• And a third generated $90K in SMS revenue in three months.

What sets Pro Marketer apart as a Klaviyo email and SMS partner is their structured approach. 

They do not just send emails. They build the full retention marketing system for your brand, from the initial Klaviyo account setup and audit through to strategy, execution, segmentation, and ongoing optimization.

Their process:

• Identify: They start by getting to know your brand, your customers, and your ecommerce revenue goals. The focus is on finding the right combination of strategies and channels for your specific business

• Audit: Before building anything new, they audit what you already have. Email flows, campaign performance, SMS setup, and list health. They identify gaps, leaks, and missed opportunities

• Strategize: They develop a detailed retention marketing plan that covers the full customer lifecycle. Every subscriber gets the right message at the right moment through smart segmentation and personalization

• Execute: With the strategy in place, their team of copywriters, designers, and strategists brings it to life. Flows go live, campaigns go out, and automations trigger at exactly the right points in the customer journey

What they do:

As a Klaviyo certified expert agency, Pro Marketer handles everything your ecommerce brand needs from its email and SMS channels, including:

• Klaviyo account setup and full platform configuration

• Email and SMS flow building and optimization

• Campaign management for sales, product launches, and announcements

• List segmentation and ongoing list hygiene

• Email deliverability management

• Targeted SMS marketing strategy and execution

• Klaviyo email design and copywriting

• Performance reporting and continuous optimization

Their goal for every client is simple: generate 30% to 40% of your total ecommerce revenue from email and SMS.

Contact: promarketer.ca | info@promarketer.ca | +1 647-704-7995

2. Flowium

Best for: Ecommerce brands that want deep Klaviyo technical expertise and lifecycle automation

Flowium is a Klaviyo-exclusive email marketing agency founded in 2017 and headquartered in New York. They are a Klaviyo Elite Master partner, the highest tier available, and their entire operation is built around one platform. They do not work with other ESPs, which means every part of their process is optimized specifically for how Klaviyo works.

They are best known for their technical precision on flow architecture, segmentation, and deliverability. Their team covers Klaviyo account setup, migration, full lifecycle automation, campaign management, and list hygiene. 

For ecommerce brands that want a deep technical partner for their email channel, Flowium is one of the most established options in the market.

They also run a YouTube channel and share educational resources on Klaviyo best practices, which speaks to their depth of knowledge of the platform.

3. Chronos Agency

Best for: DTC lifestyle and fashion brands that want creative-first email marketing

Chronos Agency is a Klaviyo Elite Master partner founded in 2017 and headquartered in Singapore. 

They take a creative-first approach to email marketing, building storytelling-driven campaigns. Their global team works with Shopify brands across apparel, lifestyle, and beauty, and they have expanded into SMS to keep messaging unified across channels.

For brands with a strong visual identity who want their email program to reflect it, Chronos builds campaigns that feel on-brand and high-performing. 

They are particularly strong for DTC brands that care as much about how their emails look and read as they do about the numbers.

4. Hustler Marketing

Best for: Fast-growing Shopify DTC brands that want full-service email and SMS management

Hustler Marketing is a Klaviyo Elite Master agency that generated over $100 million in email marketing revenue for its clients in 2023. 

They provide a fully done-for-you service covering strategy, design, copywriting, and management, and most of their clients see improvements in open rate, click-through rate, and revenue within two to three months.

They work heavily with rapidly expanding Shopify brands and are built for aggressive growth. 

Their strength lies in fast testing cycles, A/B optimization, and hands-on account management.

5. Andzen

Best for: DTC brands building loyalty programs and long-term retention systems

Andzen is a Klaviyo Elite Master agency founded in 2014 and based in Brisbane, Australia.

They specialize in customer lifecycle strategy and marketing automation, with particular strength in loyalty program integration. 

They work with Klaviyo, alongside platforms like Smile.io and Yotpo, to build retention systems that include loyalty tiers, repurchase incentives, and subscription management.

Andzen is for ecommerce brands that want to build long-term customer relationships rather than just running email campaigns. They are also a certified leader in CRM and customer experience optimization.

6. Magnet Monster

Best for: Ecommerce brands focused on maximizing customer lifetime value across email, SMS, and direct mail

Magnet Monster is a Klaviyo Elite Master agency founded in 2018 and based in London. 

Their focus is on maximizing the lifetime value of ecommerce customers through a multi-channel approach that includes email, SMS, direct mail, and push notifications. 

Their strategy team is made up of experienced ecommerce operators who understand the full picture of customer profitability and campaign metrics.

While many agencies focus on campaigns, Magnet Monster focuses on customer journeys and long-term revenue. 

They are a strong choice for brands that want their retention marketing to be driven by a genuine understanding of unit economics and customer value.

7. Lilo Social

Best for: DTC brands that want email and SMS fully integrated with paid media

Lilo Social, formerly known as Tequila Sunrise, is a Klaviyo Elite Master agency based in Brooklyn, New York. 

They are a full-funnel ecommerce agency that connects email and SMS with paid search, paid social, and creative strategy. 

They have appeared on the Inc. 5000 list of fastest-growing companies multiple times and work with direct-to-consumer brands looking to grow acquisition and lifetime value together.

For brands that want their Klaviyo program tightly integrated with their paid media strategy rather than operating as a separate channel, Lilo Social's multi-channel approach is a strong fit.

9. DIDO Agency

Best for: Ecommerce brands looking for targeted, database-driven email and SMS campaigns

DIDO Agency is a Klaviyo Gold Master agency founded in 2017 and based in Brooklyn, New York. 

They work with ecommerce brands globally and use database-driven marketing techniques to increase total online revenue. 

Every campaign they run is customized to the specific challenges and goals of the individual client.

Their services include email marketing, SMS, cold email, lead generation, copywriting, and campaign auditing. 

They also offer a partner referral programme that reflects their focus on long-term relationships.

How to Choose the Right Klaviyo Agency for Your Brand

Not every agency on this list will be the right fit for every brand. Here is how to choose the right one.

Start with your goals

Before you contact anyone, be sure to know exactly what you want from your email and SMS channels:

• Do you need someone to build your flows from scratch?

• Are your flows already live but underperforming?

• Do you need help with campaign management, list growth, or deliverability? 

The more specific you are about what you need, the easier it is to find an agency that is good in that area.

Match the agency to your category

Some agencies have vertical expertise that makes them a better fit for specific types of brands. 

If you sell supplements, cosmetics, or apparel, working with an agency that has built email programs in your category means they already understand your customer, your compliance requirements, and what messaging tends to convert. 

Pro Marketer, for example, has worked extensively with apparel, supplement, and cosmetics brands. Mango Grove focuses on health and wellness.

Check their Klaviyo partner status

The Klaviyo partner programme has different tiers, and the tier a partner holds reflects their platform expertise, the revenue they manage for clients, and their track record of results. 

Elite Master is the highest tier. 

If an agency claims to be a Klaviyo certified expert, ask which tier they hold and how long they have been a partner.

Look at actual results, not just case studies

A case study that says "we increased open rates by 20%" is not the same as one that says "we grew email revenue from $10K to $90K per month in three months." 

Ask for specific revenue numbers, instead of engagement metrics. The best Klaviyo agencies are proud of their revenue numbers and will share them.

Ask the right questions

When you speak to an agency, ask them:

• How they approach Klaviyo account set up for a new client

• What their audit process looks like

• How they build their segmentation strategy

• And how they measure success

The answers will tell you quickly whether you are talking to someone who understands the platform or someone who is going to apply a generic strategy to your account.

Should I Hire a Klaviyo Agency, Freelancer, or Build In-House?

A Klaviyo agency gives you a full team, platform expertise, and a proven process. You get strategists, designers, copywriters, and technical specialists working on your account. Most reputable agencies start at $2,500 to $4,000 per month for foundational work, and more for full-service management.

A freelancer can be a cost-effective option for brands in the early stages, particularly for specific deliverables such as flow builds or campaign design. The risk is that a single freelancer rarely has all the skills you need. Klaviyo strategy, copywriting, design, and technical setup are four different categories.

Building in-house works best for brands at a scale where email and SMS revenue justifies a full-time hire. The challenge is that finding someone with Klaviyo expertise, strong copywriting, design sensibility, and strategic thinking is difficult and expensive. Most brands that go this route end up supplementing their in-house person with agency support anyway.

For most growing ecommerce brands, working with the right Klaviyo agency is the most efficient path to building high-performing email and SMS channels, particularly in the early stages, when foundational flows and segmentation strategies need to be built correctly.

Final Thoughts

Email and SMS are still the highest-returning owned channels available to ecommerce brands.

The brands that invest in building these channels properly, with the right partner and the right strategy, consistently outperform those that don’t.

The agencies on this list all have Klaviyo expertise and proven results. The right one for your brand depends on your category, your stage of growth, and what you need most right now.

If you are a DTC or ecommerce brand looking for a Klaviyo partner that has already built this for brands like yours and can show you the revenue numbers to prove it, get in touch with Pro Marketer.

FAQs

1. What does a Klaviyo consultant actually do?

A Klaviyo consultant reviews your current email and SMS setup, identifies gaps in your flows, segmentation, and campaign strategy, and builds a roadmap for improving performance.

Depending on the scope of engagement, they may also execute the work themselves, including rebuilding flows, resolving deliverability issues, properly setting up your Klaviyo account, and developing a retention marketing strategy. 

2. How much does a Klaviyo agency cost in 2026?

Most Klaviyo agencies charge between $2,500 and $10,000 per month, depending on the scope of work, the size of your list, and the complexity of your account. 

As a general rule, brands generating under $25K per month from email should expect to pay between $2,500 and $4,000 for foundational services. 

Brands at $25K to $100K per month work with agencies in the $4,000 to $6,500 range. For brands at $100K per month and above, full-service retainers can run from $6,500 to $10,000 per month or more. 

A useful benchmark is to spend 5% to 10% of your email-attributed revenue on agency fees.

3. What questions should I ask a Klaviyo agency before hiring?

Ask them what their onboarding and Klaviyo account setup process looks like. Ask how they approach segmentation and what segments they build for a typical ecommerce brand. 

Ask what flows they prioritize building first and why. Ask how they measure success and what metrics they report on. 

Ask for specific revenue results from previous clients, not open and click rates. And ask what their Klaviyo partner tier is and how long they have been working on the platform. 

4. Why do ecommerce businesses need the best Klaviyo agency?

Brands with properly built flows, smart segmentation, and a consistent campaign strategy regularly generate 30% to 40% of their total revenue from email and SMS. Brands without it are not getting that amount of revenue. 

The best Klaviyo agency does not just send emails. They build retention infrastructure that compounds over time, turning one-time buyers into repeat customers and reducing your dependence on paid acquisition to sustain revenue growth.