Top 13 Best Klaviyo Email Marketing Agencies for Successful Campaigns in 2025

As of 2025, Klaviyo has solidified its position as the go-to platform for ecommerce email and SMS automation, driving demand for agencies that can unlock its full potential. 

But not all providers are created equal. The best Klaviyo email marketing agencies in 2025 go far beyond setting up flows — they build retention ecosystems rooted in strategy, behavioral data, and revenue outcomes. These firms combine sharp creative, platform fluency, and tested segmentation to help brands turn customer journeys into predictable profit engines. 

Below, we’ve selected 13 agencies that stand out for their technical expertise, strategic depth, and ability to scale results without wasting time or ad spend.

Brief Overview: How We Selected the Best Klaviyo Email Marketing Agencies in 2025

To identify the best Klaviyo email marketing agencies in 2025, we evaluated firms based on a combination of technical capability, client outcomes, industry reputation, and service structure. Our focus was on agencies with proven expertise in Klaviyo — not just those who list it among their tools, but those who build strategy, automation, and revenue flows specifically around the platform.

We reviewed each agency’s track record across ecommerce verticals, particularly their ability to drive retention, scale flows, and lift repeat purchase rates. Agencies were assessed on:

• Depth of Klaviyo integration
• Range and quality of services offered (from copy to segmentation)
• Value delivered
• Notable clients and case studies
• Recognition from Klaviyo and industry partners
• Verified third-party reviews (Clutch, G2, and others)

We also factored in agency specialization—some serve enterprise ecommerce brands with complex catalogs, while others deliver high-velocity execution for DTC startups. The goal was to highlight a mix of high-performing partners across different budgets, geographies, and growth stages. 

Before we begin, here’s a quick overview:

Our Ranking of the Best Klaviyo Email Marketing Agencies in 2025

1. InboxArmy

Clutch Rating: 4.9
HQ: Grapevine, Texas, USA
Size: 25–249 employees

InboxArmy is an award-winning Klaviyo email marketing agency and one of the top performers in the United States, known for its deep Klaviyo expertise and scalable solutions tailored for both ecommerce and enterprise clients. Founded in 2016, the agency has spent nearly a decade perfecting its methods in lifecycle marketing, campaign execution, and advanced email automation.

InboxArmy serves mid-sized businesses to enterprise-level clients across more than 25 industries, including ecommerce, SaaS, universities, retail, real estate, food and beverages, banking, healthcare, automotive, pets, travel, and manufacturing. This broad industry reach allows the agency to adapt strategies that align with sector-specific needs while maintaining performance consistency.

Led by founder Chris Donald and CEO Scott Cohen—an ANA Email Marketer of the Year and co-chair of the ANA Email Excellence Center—the team brings over 20 years of strategic and technical email marketing leadership into each project. With an estimated revenue of $5.5 million, InboxArmy operates using a hybrid team model that delivers high-impact results at competitive rates. Their portfolio includes global brands such as Hilton, P&G, and Airbnb, reinforcing their reputation as one of the best Klaviyo email marketing agencies in the U.S. focused on delivering measurable business outcomes.

Services Offered:

• Klaviyo email and SMS strategy
• Automation and lifecycle flows
• Email template design and production
• Campaign management
• Deliverability optimization
• ESP migration
• White-label email marketing services

Awards: Klaviyo Silver Master Partner
Notable Clients: Hilton, P&G, Airbnb, Ubisoft, Jockey, Hasbro, Purple, eBay
LinkedIn: https://www.linkedin.com/company/inbox-army
Why we chose it: InboxArmy combines enterprise-level expertise with flexible service models, making it a versatile choice for both startups and global brands.

2. Zettler Digital

ShopifyPartners Rating: 5.0
HQ: USA (nationwide reach)
Size: 11–50 employees

Founded in 2014 by Ben Zettler, Zettler Digital has built a reputation as one of the top Klaviyo email marketing agencies for fast-growing DTC brands. The agency takes a value-based pricing model focused on outcomes rather than billable hours—a philosophy that appeals to performance-driven ecommerce companies. While the company hasn’t disclosed its revenue, it’s widely known for working with globally recognized names across fashion, food, and sports verticals.

Zettler Digital primarily serves clients in the US but also works with international brands. With an elite Klaviyo Partner badge and status as a Shopify Plus and Meta Business Partner, the agency provides not only retention marketing but also strategic consulting across paid channels and CRO. The blend of technical depth and design-led execution helps explain why clients like Netflix and the Wu-Tang Clan stick around.

Services Offered:

• Klaviyo email and SMS marketing
• Shopify Plus consulting
• Website design and development
• Conversion rate optimization
• Facebook, Instagram, and Google Ads management

Awards:

• Klaviyo Elite Partner
• Shopify Plus Consulting Partner
• Meta Business Partner
• Google Partner

Notable Clients: Netflix, Wu-Tang Clan, nutpods, Mariano Rivera, SLAM, Bleacher Report
LinkedIn: https://www.linkedin.com/company/zettlerdigital
Why we chose it: Zettler Digital’s value-over-volume model reflects its focus on meaningful performance gains.

3. Chronos Agency

Clutch Rating: 4.9
HQ: Singapore
Size: 77–80 employees

Chronos Agency, founded in 2017 by Joshua Chin and Louis Teo, serves ecommerce clients worldwide with a strong presence in Southeast Asia, Australia, and North America. The agency has managed projects ranging from $1,000 to over $300,000, showing a wide ability to scale services. Known for its deep specialization in lifecycle and retention marketing, Chronos builds campaigns that prioritize high-impact flows over one-off email blasts.

The agency’s revenue is under $5 million, but its 400+ client portfolio and Klaviyo Master Elite. With a team of strategists, designers, and compliance experts, Chronos delivers full-stack retention services designed to grow average order value and boost repeat purchases.

Services Offered:

• Klaviyo email, SMS, and push marketing
• Lifecycle and retention campaigns
• Paid media strategy
• Copywriting and visual design
• A/B testing and analytics
• Compliance and deliverability consulting

Awards:

• Klaviyo Master Elite Partner
• Clutch Global Leader (2020)

Notable Clients: Truly Beauty, ForChics, Pupnaps, 400+ ecommerce brands
LinkedIn: https://www.linkedin.com/company/chronosagency
Why we chose it: Chronos specializes in lifecycle and retention marketing for ecommerce, positioning itself among the best Klaviyo email marketing agencies.

4. Lilo Social

Clutch Rating: 4.9
HQ: New York City, NY, USA
Size: 11–50 employees

Lilo Social, founded in 2018 by Karly Craig and Ryan Mulvihill, may not boast a massive team, but it delivers heavyweight results. The agency has helped DTC brands boost email revenue by over 960%, focusing heavily on popups, deliverability, and campaign timing. While it doesn’t disclose revenue figures, its consistent client results and mid-range pricing make it one of the top Klaviyo email marketing agencies for brands aiming to grow email into a dominant channel.

Serving primarily the US market, Lilo Social covers health, retail, fitness, and CBD sectors. Their strength lies in building integrated SMS and email campaigns that deliver not just engagement—but measurable revenue impact.

Services Offered:

• Email and SMS strategy and execution
• Popups, opt-ins, and list growth
• Copywriting and creative
• Deliverability optimization
• Project management and Klaviyo integrations

Awards: N/A
Notable Clients: Obvi, FatSnax, DankStop, The Cereal School, KOS, DefenderShield
LinkedIn: https://www.linkedin.com/company/lilosocial
Why we chose it: Their email-first discipline has delivered outsized ROI, especially for lean, fast-moving DTC brands.

5. Fuel Made

Clutch Rating: 5.0
HQ: Colbert, Washington, USA
Size: 11–50 employees

Fuel Made is an established email marketing agency with advanced Klaviyo expertise, serving ecommerce brands—especially those on Shopify. Founded in 2000, the company has over two decades of experience optimizing online stores and building lifecycle email systems that convert. While its estimated revenue ranges between $100–$250 million, Fuel Made has kept its operations boutique, maintaining a strong focus on high-quality design, data-driven retention, and revenue-focused flows.

The agency primarily serves clients in the US but has taken on global brands as well. It partners closely with Klaviyo and Shopify Plus, positioning itself as a technical and creative powerhouse in retention marketing. Fuel Made’s track record in email automation and site optimization places it among the best Klaviyo email marketing agencies for Shopify-based ecommerce brands.

Services Offered:

• Klaviyo email and SMS marketing
• Shopify design and development
• Conversion rate optimization (CRO)

Awards:

• Klaviyo Master Elite Partner
• Shopify Plus Partner

Notable Clients: Tuft + Paw, BK Beauty, Turbie Twist, Office Oasis, Super7
LinkedIn: https://www.linkedin.com/company/fuel-made
Why we chose it: Fuel Made blends Klaviyo email expertise with elite Shopify design, creating seamless retention systems across channels.

6. King Pixel Digital

Clutch Rating: 4.8
HQ: Adelaide, Australia
Size: 2–9 employees

King Pixel Digital is a boutique email marketing agency with Klaviyo expertise and a specialization in conversion-focused retention campaigns. Founded in 2017 by award-winning retail marketer Sarah-Jane Picton-King, the agency combines creative storytelling with automated flows and CRM strategy. Despite its small size, King Pixel maintains a diverse client base across fashion, hospitality, and wine tourism sectors in Australia and beyond.

While its estimated revenue is not publicly available, King Pixel has achieved impressive ROI for small-to-mid-sized ecommerce brands, reporting cost-per-acquisition as low as $10 per sale on some campaigns. The agency’s flexibility and tailored service model make it an ideal fit for brands looking for hands-on, Klaviyo-certified support.

Services Offered:

• Klaviyo email and SMS marketing
• Shopify optimization
• Meta, Google, and TikTok ads
• Content production and lead generation
• CRM automation

Awards:

• Founder awarded in retail marketing excellence

Notable Clients: StartCon, St. Louis House of Fine Ice Cream, Renew Adelaide
LinkedIn: https://www.linkedin.com/company/king-pixel-digital-marketing
Why we chose it: King Pixel seamlessly mixes retail intelligence and email automation together, especially for niche markets.

7. Sticky Digital

Clutch Rating: N/A
HQ: San Diego, California, USA (also listed in San Luis Obispo, CA)
Size: 11–50 employees

Sticky Digital is a retention-focused email marketing agency known for its Klaviyo expertise and Shopify-centric client base. Originally formed in 2019 and restructured under an LLC in 2023, the agency has helped scale more than 50 ecommerce brands from $1M to $50M+ in revenue. With a focus on lifecycle marketing, loyalty programs, and CRO, Sticky Digital’s strategic work has earned it recognition as a top agency in North America for retention marketing.

Although the firm doesn’t disclose revenue figures, its track record and boutique structure suggest a high-value, low-volume client strategy. Sticky Digital works primarily with North American brands, specializing in ecommerce verticals with subscription or loyalty-driven models.

Services Offered:

• Klaviyo email and SMS retention marketing
• Shopify and ecommerce optimization
• Loyalty and subscription strategy
• Lifecycle automation
• Segmentation and tech stack advisory

Awards:

• Voted #1 Retention Marketing Agency in North America (2023)

Notable Clients: Scaled 50+ ecommerce brands (specific names not publicly listed)
LinkedIn: https://www.linkedin.com/company/sticky-digital-retention/
Why we chose it: Sticky Digital’s deep lifecycle expertise makes it a go-to for subscription brands serious about long-term growth.

8. DIDO Agency

Clutch Rating: 4.9
HQ: Brooklyn, New York, USA
Size: 11–50 employees

DIDO Agency is a dedicated email marketing agency with a focus on Klaviyo-powered ecommerce and B2B retention. Founded in 2017, the agency has built a strong reputation for delivering hands-on service, strategic planning, and high-conversion flows. While revenue figures aren’t disclosed, client feedback consistently highlights 35–55% sales increases from Klaviyo email implementations alone.

DIDO works with brands across fashion, tobacco, finance, and wellness, primarily in the US. Their Klaviyo Platinum Partner status affirms their technical command of the platform, from segmentation and compliance to creative and behavioral automation.

Services Offered:

• Klaviyo strategy and implementation
• Email and SMS campaign management
• Copywriting and creative
• Segmentation and analytics
• Flow development and A/B testing

Awards:

• Klaviyo Platinum Partner

Notable Clients: Clients across fashion, beauty, B2B, and finance (specific names not public)
LinkedIn: https://www.linkedin.com/company/didoagency/
Why we chose it: DIDO balances strategy and execution with measurable Klaviyo-driven ROI for ecommerce and B2B brands.

9. Andzen

Clutch Rating: N/A
HQ: Australia (with offices in the US and Philippines)
Size:11–50

Andzen is a specialist email marketing agency with deep Klaviyo expertise, focused on mapping customer journeys and optimizing multichannel lifecycle communications. Originally founded in London as Sign-Up.to, the agency transitioned into Andzen through a strategic pivot, now operating globally with a strong APAC and US presence. Though revenue details remain undisclosed, their performance benchmarks consistently exceed industry standards for open rates and ROI.

The agency helps ecommerce brands automate and personalize retention strategies across email and SMS. Co-founded by Matt and Brenden, Andzen became the first Klaviyo Master Elite Partner in the Asia-Pacific region and remains a thought leader in data-driven segmentation and CX.

Services Offered:

• Klaviyo email and SMS marketing
• Customer journey mapping and automation
• Visual and written creative production
• Integration with tools like Smile.io, JustUno, Octane AI
• Multi-channel communication strategy

Awards:

• First Klaviyo Master Elite Partner in APAC

Notable Clients: Not publicly listed
LinkedIn: https://au.linkedin.com/company/andzen
Why we chose it: Andzen combines creative rigor and Klaviyo precision to build standout emails that convert.

10. No Limit Email

Clutch Rating: 5.0
HQ: Sydney, Australia
Size: 11–50 employees

No Limit Email is an email marketing agency with a focus on Klaviyo automation and lifecycle strategy for ecommerce brands. Founded in 2020, the agency has quickly built a client portfolio that includes Unilever, AvalonKing, and over 120 DTC companies. The leadership team—Michael Galvin, Josh Tay, and Kevin Parekkattil—brings hands-on retention marketing experience aimed at scaling brands through owned channels.

The agency operates primarily in Australia and the US. Projects typically range from $5,000 to $49,000, with strong client retention due to results-oriented execution. Their cultural fit and transparent communication also contribute to strong reviews and repeat business, reinforcing their position among the best Klaviyo email marketing agencies for fast-scaling ecommerce companies.

Services Offered:

• Klaviyo email and SMS marketing
• Campaign creation, strategy, and automation
• Copywriting and lifecycle optimization
• Segmentation and performance tracking

Awards:

• Multiple awards in 2024 (not named)

Notable Clients: Unilever, AvalonKing, Carnivore Snax, Dēpology, ECOM GROUP LLC
LinkedIn: https://www.linkedin.com/company/no-limit-email/
Why we chose it: No Limit Email delivers high-velocity execution backed by real growth metrics for Klaviyo-based campaigns.

11. Retention.com

G2 Rating: 4.5
HQ: Austin, Texas, USA
Size: 11–50 employees 

Retention.com is a SaaS-backed email marketing agency with advanced Klaviyo integration. Founded in 2019 by Adam Robinson, it has scaled to $22 million in ARR without external funding. The agency focuses on reclaiming lost revenue, automating retention flows, and growing email lists for Shopify stores.

Their proprietary tools (“reclaim” and “grow”) integrate with Klaviyo to capture anonymous visitors and re-engage them through precision segmentation. With clients across the US and internationally, Retention.com has helped ecommerce brands lift email revenue by up to 29% in the first six months—a standout result among the best Klaviyo email marketing agencies.

Services Offered:

• Klaviyo setup and flow optimization
• Abandoned cart recovery
• Segmentation and automation
• Template design and campaign strategy
• List growth via proprietary reclaim/grow tools

Awards: N/A

Notable Clients: Not publicly disclosed
LinkedIn: https://www.linkedin.com/company/retentioncommerce/
Why we chose it: Retention.com automates up to 50% of email revenue with tech-augmented Klaviyo flows that actually deliver.

12. Magnet Monster

Google Rating: 5.0
HQ: Welwyn Garden City, Hertfordshire, UK
Size: 11–50 employees 

Magnet Monster is a boutique email marketing agency specializing in Klaviyo-based behavioral and retention campaigns for DTC brands. Founded in 2019 by Adam Kitchen and operated under Accelerate Commerce Ltd, the agency quickly transitioned from volume-based billing to a value-driven model, lifting client ROI across campaigns and lifecycle flows.

With clients like Wild, Outerknown, and Waterdrop, Magnet Monster primarily serves UK and global ecommerce brands. Estimated 2024 revenue crossed the seven-figure threshold, and the team aims for eight figures by scaling selectively. As one of the best Klaviyo email marketing agencies in Europe, Magnet Monster is known for deep retention strategy and creativity that doesn’t compromise analytics.

Services Offered:

• Klaviyo email and SMS marketing
• Lifecycle flows, automation, segmentation
• AI-powered personalization
• Creative and copywriting
• Loyalty and direct mail campaigns
• Strategy consulting and workshops

Awards: Klaviyo Master Elite Partner

Notable Clients: Waterdrop, Duradry, Wild, Outerknown, Carved, Bliss, CoverFX
LinkedIn: https://www.linkedin.com/company/magnetmonster/
Why we chose it: Magnet Monster fuses strategic intelligence with Klaviyo execution for revenue lifts that speak for themselves.

13. Mineral.io

G2 Rating: 4.4
HQ: New York, NY, USA
Size: 11–50 employees

Mineral.io is a boutique retention and email marketing agency built around high-touch Klaviyo campaigns for premium ecommerce brands. Founded in 2016 by Matt Sanocki, the agency focuses on handcrafted flows, creative lifecycle sequences, and strong visual design. Mineral’s client list includes off-road, lifestyle, and entertainment brands, all served with a focus on user-friendly, data-informed communications.

The agency’s estimated revenue isn’t public, but its tight focus on high-value client relationships and Klaviyo-certified delivery makes it one of the best Klaviyo email marketing agencies for lifestyle ecommerce. Clients frequently cite responsiveness and strategic guidance as major differentiators.

Services Offered:

• Klaviyo email and SMS marketing
• Retention automation and analytics
• Direct mail marketing
• Creative design and content
• Lifecycle segmentation and data strategy

Awards: Klaviyo Elite Partner

Notable Clients: Dude Perfect, PRP Seats, Baja Designs, Bellocq Tea
LinkedIn: https://www.linkedin.com/company/mineral-io/
Why we chose it: Mineral.io blends premium design with retention logic, giving ecommerce brands flows that both look and perform better.

Final Thoughts

With Klaviyo powering some of the most effective ecommerce retention strategies in 2025, choosing the right agency can mean the difference between stagnant performance and compounding ROI. The agencies on this list don’t simply plug in automations—they build tailored, data-driven ecosystems that scale revenue, engagement, and customer lifetime value. Whether you’re a fast-moving DTC brand or an established enterprise, the best Klaviyo email marketing agencies combine technical fluency with creative execution and consistent results.

InboxArmy stands out as the best choice, offering proven expertise across 25+ industries and a decade of experience turning Klaviyo into a high-performing growth engine for mid-sized and enterprise clients alike. In email marketing, as in business, consistency beats flash—and InboxArmy delivers exactly that.

FAQ

Is Klaviyo good for email marketing?

Yes. Klaviyo is purpose-built for email and SMS marketing, especially for ecommerce brands. It excels in segmentation, automation, and real-time behavioral tracking. Unlike generalist tools, Klaviyo gives marketers access to data-rich flows, intuitive A/B testing, and native ecommerce integrations (like Shopify and WooCommerce), which allow for better personalization and retention performance.

Which is the best email marketing company?

There isn’t a single “best” for everyone, as it depends on your needs, budget, and goals. For ecommerce brands using Klaviyo, InboxArmy consistently stands out due to their retention-first strategies, technical mastery, and proven ROI across diverse verticals. We’ve ranked 13 of the best Klaviyo email marketing agencies above, each excelling in different areas such as lifecycle automation, creative, or CRM integration.

Is Klaviyo better than Mailchimp?

For ecommerce, Klaviyo is widely regarded as more powerful than Mailchimp. It offers more robust automation capabilities, better ecommerce data syncing, and superior segmentation. Mailchimp remains a solid option for small businesses or general-purpose newsletters, but Klaviyo’s focus on data-driven growth gives it the edge for brands looking to scale retention and revenue.

What is the best CRM for email marketing?

If email is the main priority, Klaviyo functions as both an email platform and lightweight CRM, making it ideal for DTC ecommerce. For businesses needing broader CRM capabilities with sales pipelines, platforms like HubSpot or Salesforce may be more appropriate. The best choice depends on whether you’re optimizing for email engagement or full customer lifecycle management.

Also Read; Generative AI for Marketing: Revolutionizing Creativity and Campaigns