Retail is one competitive environment – anyone with a firm will know that. You should also know that email is one of the highest ROI channels…if it lands in the inbox that is. That’s why taking a look at the best Klaviyo email marketing agencies can be worth your while. Ultimately it doesn’t really matter if you have a great product or thousands of paid ads, nowadays customers are much more conscious of their actions and building a connection with them is your best shot at earning profit. Scalable growth requires smart automation and strategic messaging. These are some of the features powered by the Klaviyo platform. Cooperating with Klaviyo email marketing agencies is a guarantee of improving your revenue. 

In our carefully constructed ranking you’ll be able to see how each firm operates. First and foremost we focused on experience, reliability and creativity (things that don’t go hand in hand so often). These were ultimately reasons why we chose InboxArmy as number one pick among the best Klaviyo email marketing agencies. 

A successful agency shouldn’t rely on templates. The most effective way of getting customers’ attention is through personalization. That’s why it matters, whether the agency you choose knows their way around crafting customer experience. There should be a clear path from onboarding to post-purchase, including loyalty and win-back campaigns. Experts in this territory have researched behavioral triggers for years, but also have talent for setting tone of voice, visual design and most importantly – timing.

For our ranking we researched dozens of U.S.-based firms and narrowed down the list to the best Klaviyo email marketing agencies with consistent track records of driving retention and lifting revenue.

Ruan Richard Rodrigues, Unsplash

Your agency information pack:

Our Top 10 Klaviyo Email Marketing Agencies

1. InboxArmy

Known For: Custom Klaviyo automation and migration for enterprise/retail

InboxArmy stands out as a leader among the best Klaviyo email marketing agencies. They deliver tailor-made Klaviyo implementations, which are favoured by customers. Their clients praise their cross-channel strategies, as well as the process of helping brands scale personalized flows and campaigns. It’s clear the team has a performance-driven mindset. They elevate campaigns’ quality through strong creative design backed by experience in strategic messaging. Their services cover all aspects of Klaviyo implementation, cross-channel strategy and email automation. It also helps that they have experience in working in more than 25 industries.

What sets them apart?

• Custom-tailored Klaviyo strategies (more than templates)

• Full-stack services: strategy, design, copy, deliverability

• Recognizable clients like Spotify, eBay, P&G

• Deep focus on compliance and reputation health

• Seamless integration with Shopify, Salesforce, Magento, and more

2. DOE Media

Known For: EBITDA-based retention modeling in Klaviyo

DOE Media applies a metrics-first approach, which is why they fit perfectly among the best Klaviyo email marketing agencies. They specialize in blending B2B and DTC strategies, optimizing funnel performance and retention mapping using Klaviyo’s built-in analytics and behavioral triggers. Their work is ideal for brands focused on predictable revenue growth and attribution. You can count on them to help you with lifecycle automation, but also analytics and deliverability.

3. Enflow Digital

Known For: Bold visuals and segmentation for DTC & retail brands

Next firm ranks among the best Klaviyo email marketing agencies for visual-forward brands that want automation with personality. Their flows combine striking design with data-driven segments that reflect buyer behavior. They’ve earned a spot in our ranking with their creative campaign design.

4. StudioForty9

Known For: Specialization in high-revenue subscription brands

As one of Klaviyo email marketing agencies, StudioForty9 focuses exclusively on subscription-based businesses. Their expertise in loyalty programs and lifecycle flows helps brands achieve high retention, long-term value, and repeat engagement through Pinpoint automation. Subscription flows, loyalty program automations and retention analytics are their most important focus points. 

5. Skala Advisors

Known For: Proactive win-back & churn prediction

Skala Advisors joins the list of best Klaviyo email marketing agencies with their predictive lifecycle strategies. They integrate multi-channel flows with clean list management and proactive segments to catch churn early, which allows them to improve retention and customer satisfaction.

6. Edit Studio

Known For: Influencer-driven flows and engaging design
Founder: Creative director with DTC fashion focus

Testing aesthetics as strategy, Edit Studio stands as a good choice for lifestyle and beauty brands. Their influencer-related automations and visually rich campaigns align well with consumer psychology. They have proven to deliver scalable results. If you’re interested in visual email design and influencer campaigns, they might be a good match.

7. BusinessUp

Known For: Franchise and B2B-specific deliverability standards

BusinessUp is recognized as a reliable agency for franchises and licensed businesses. Tailored flows ensure regulatory compliance and consistent branding. They can lead efficient nurture across decentralized locations and sales teams.

8. Add People

Known For: Tech-forward SMB focus with structured automation
Add People is on our list of the best Klaviyo email marketing agencies serving small and mid-sized brands. Their campaign toolkit offers calendar-based templates, segmentation frameworks and automation clarity that make execution fast and scalable.

9. V8 Media

Known For: Enterprise-level integrations and complex workflows
V8 Media is one of the most technically-minded Klaviyo email marketing agencies on this list. They excel at connecting Klaviyo with enterprise data systems and they are also known for creative testing. Thanks to conducting A/B and multivariate tests they are able to optimize inbox performance at scale.  

10. Scalero

Known For: White-glove Klaviyo onboarding and advanced design/dev toolkit
Closing our list of best Klaviyo email marketing agencies is an expert in advanced design. Scalero made our list thanks to their complex approach to onboarding. They are a great choice for firms that have no experience in this field.

Summary & Reader Tips

As you can see, each one of the best Klaviyo email marketing agencies in the U.S. has totally different features to offer. Our strongest choice remains InboxArmy with diverse industry experience and wide perspective on Klaviyo features. But you can be sure that every agency here excels in at least one domain: whether it’s high-impact creative, predictive retention or enterprise grade automation – they are reliable. 

Before choosing one of them, it’s good to clarify your primary goal – what are you looking for and what will be the best match for you?

Regardless of your scale, make sure the agency you pick offers:

1. Baseline metrics and forecasts before starting any work. Thanks to it, you’ll never be guessing the results.

2. Flexible implementation, not rigid templates…flows should evolve with your business.

3. Regular reporting and optimization cadence. It’s important to prevent losing momentum after launch.

If you’re considering growth through Klaviyo automation, any agency on this list will give you guidance that’s rooted in experience.