Best Klaviyo Email Marketing Agencies [2026]

A Klaviyo email marketing agency is a specialized retention marketing partner that helps ecommerce and DTC brands maximize revenue from email and SMS using the Klaviyo platform. With automated flows generating nearly 41% of total email revenue from just 5.3% of sends, the difference between a good Klaviyo setup and a great one can mean hundreds of thousands in recovered revenue. These agencies handle everything from flow architecture and segmentation to campaign strategy and creative — so your team can focus on product and growth.

Below, we've ranked the best Klaviyo email marketing agencies for 2026 based on platform expertise, client results, industry specialization, and retention marketing depth.

Quick Comparison Table

1. Propel

Propel is a retention and lifecycle marketing agency that works across Klaviyo, Customer.io, and Braze. Unlike agencies that only handle email, Propel builds full-funnel retention systems — from onboarding flows and churn prediction models to win-back sequences and cross-channel orchestration.

Key Strengths:

• Deep Klaviyo expertise paired with Customer.io and Braze for brands that outgrow basic setups
• Focuses on customer lifetime value optimization, not just open rates
• Proven results across DTC, healthtech, and subscription verticals
• Data-driven approach with retention metric tracking built into every engagement

Platforms Supported: Klaviyo, Customer.io, Braze, Segment

Best For: DTC brands, healthtech companies, and subscription businesses that need a strategic retention partner — not just an email executor.

2. Flowium

Flowium is a Klaviyo Master Elite Partner focused exclusively on email and SMS retention marketing. They've built a strong reputation for technical automation expertise, delivering data-driven strategies that maximize engagement and repeat purchases for growth-stage DTC brands.

Key Strengths:

• Klaviyo Master Elite Partner with deep platform knowledge
• Specializes in advanced flow architecture and segmentation
• Strong track record with Shopify Plus brands
• Transparent reporting and revenue attribution

Platforms Supported: Klaviyo

Best For: Growth-stage DTC and Shopify brands looking for hands-on Klaviyo management with a focus on automated flows.

3. Hustler Marketing

Hustler Marketing has spent more than nine years focused exclusively on email, SMS, and retention marketing. They've served over 450 brands and generated $105M+ in email revenue for clients — a number that speaks to their scale and consistency.

Key Strengths:

• Massive portfolio with documented revenue impact across hundreds of brands
• Dedicated teams for campaign management, design, and flow optimization
• Strong emphasis on A/B testing and data-backed creative decisions
• Comprehensive onboarding audits before engagement begins

Platforms Supported: Klaviyo, Omnisend

Best For: High-volume Shopify stores that want a proven email agency with a large team and established playbooks.

4. InboxArmy

InboxArmy is a full-service email marketing agency serving mid-market and enterprise brands across 25+ industries. Their campaigns regularly generate 20–30% of client revenue, with clients spanning from ecommerce to SaaS.

Key Strengths:

• Works across 25+ industries, so they bring cross-vertical insights
• Full-service: strategy, design, development, deliverability, and analytics
• Strong deliverability team — critical for high-volume senders
• Enterprise-grade operations with dedicated account management

Platforms Supported: Klaviyo, Mailchimp, HubSpot, Salesforce Marketing Cloud

Best For: Mid-market and enterprise brands that need a multi-platform email partner.

5. Chronos Agency

Chronos Agency specializes in lifecycle marketing for scaling ecommerce businesses. With a global remote team and particular strength in the APAC region, they combine Klaviyo expertise with push notification and SMS strategies.

Key Strengths:

• Strong presence in the APAC ecommerce market
• Lifecycle-first approach covering email, SMS, and push
• Performance-based reporting tied to revenue metrics
• Solid experience with scaling brands doing $1M–$50M in annual revenue

Platforms Supported: Klaviyo, Omnisend

Best For: Ecommerce brands scaling internationally, especially those with APAC market presence.

6. Forge Digital Marketing

Forge Digital Marketing focuses specifically on Shopify brands that need to turn their email list into a revenue engine. Their approach is lean and direct — audit, build flows, optimize campaigns, and report on revenue impact.

Key Strengths:

• Shopify-first focus with deep Klaviyo integration knowledge
• Quick turnaround on flow buildouts and campaign launches
• Emphasis on ROI reporting and revenue attribution
• Lean team structure means fewer layers and faster communication

Platforms Supported: Klaviyo

Best For: Shopify brands that want a fast, focused Klaviyo partner without the overhead of a large agency.

7. Andzen

Andzen specializes in retention marketing and Klaviyo automation for DTC brands in Australia and New Zealand. They deliver campaign planning, loyalty programs, creative email design, and advanced flow optimization.

Key Strengths:

• Deep knowledge of the AU/NZ ecommerce market
• Strong creative capabilities — email design is a differentiator
• Loyalty program integration alongside email and SMS
• Segmentation strategies that go beyond basic RFM

Platforms Supported: Klaviyo

Best For: DTC brands in Australia and New Zealand looking for a retention-focused Klaviyo partner.

8. Zettler Digital

Zettler Digital combines lifecycle marketing with CRO and analytics. Their approach is data-heavy — they use analytics to inform email strategy, which makes them a good fit for brands that want email to be tied directly to site performance.

Key Strengths:

• Bridges the gap between email marketing and conversion rate optimization
• Analytics-first approach to segmentation and campaign targeting
• Experience with Shopify ecosystem and Klaviyo integrations
• Holistic view of the customer journey from site visit to email engagement

Platforms Supported: Klaviyo

Best For: Shopify brands that want email marketing connected to CRO and analytics.

9. Mayple

Mayple isn't a traditional agency — it's a vetted marketplace that matches brands with pre-screened Klaviyo email marketing experts. This model gives you the flexibility of a freelancer with the vetting quality of an agency.

Key Strengths:

• Vetted experts with verified past performance data
• Flexible engagement models — project-based or ongoing
• Quick matching process based on your industry and needs
• Built-in performance monitoring

Platforms Supported: Klaviyo, and various others depending on the expert

Best For: Brands that need flexible, vetted Klaviyo expertise without committing to a full agency retainer.

10. SmartSites

SmartSites is a full-stack digital marketing agency that includes email marketing within a broader growth strategy. They're a good fit if you want Klaviyo managed alongside SEO, PPC, and web design.

Key Strengths:

• Full digital marketing stack — email, SEO, PPC, social, web design
• Strong track record with Shopify and WooCommerce brands
• Dedicated Klaviyo specialists within a larger team
• Good for brands that want one agency handling multiple channels

Platforms Supported: Klaviyo, HubSpot, Mailchimp

Best For: Brands that want email marketing as part of a comprehensive digital strategy with one partner.

How to Choose the Right Klaviyo Email Marketing Agency

Evaluate Their Klaviyo Partnership Tier

Klaviyo has a formal partner program with tiers — Master Elite, Elite, Gold, Silver. Higher tiers indicate more certified experts, higher client volume, and verified performance. Look for agencies at the Gold level or above for serious Klaviyo work.

Look at Revenue Attribution, Not Just Open Rates

Any agency can report open rates. The best ones track revenue per recipient, flow revenue as a percentage of total email revenue, and customer lifetime value changes over time. According to Klaviyo's own benchmarks, top-performing flows earn up to $16.96 per recipient — ask agencies what their clients achieve.

Assess Their Approach to Retention vs. Campaigns

Agencies focused on weekly campaigns will keep your list engaged. Agencies focused on lifecycle flows and retention strategy will drive compounding revenue. The best do both — but prioritize flows, since they generate 41% of email revenue from just 5.3% of sends.

Check Industry Experience

A Klaviyo agency that's worked primarily with fashion brands may not know how to build flows for a health-tech subscription service. Make sure their client portfolio includes brands in your vertical or with similar business models.

Ask About Their Full-Stack Capabilities

Email doesn't exist in a vacuum. The best Klaviyo agencies also handle SMS, push notifications, and cross-channel orchestration. If your growth plans include multi-channel retention marketing, make sure your agency can scale with you.

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FAQs

What does a Klaviyo email marketing agency do?

A Klaviyo email marketing agency manages your entire email and SMS marketing program on the Klaviyo platform. This includes building automated flows (welcome series, abandoned cart, post-purchase, win-back), designing and sending campaigns, managing segmentation strategy, and reporting on revenue impact. The best agencies also handle retention strategy and lifecycle marketing beyond just email execution.

How much does a Klaviyo agency cost?

Klaviyo agency pricing typically ranges from $2,000 to $10,000+ per month depending on scope, list size, and the agency's tier. Smaller agencies or freelancers may start at $1,500/month for basic flow management, while full-service retention agencies with strategy, creative, and multi-channel capabilities charge $5,000–$10,000+ monthly. Most agencies require a 3–6 month minimum commitment.

What's the difference between a Klaviyo consultant and a Klaviyo agency?

A Klaviyo consultant is typically an individual expert who provides strategic guidance, audits, or project-based Klaviyo work. An agency provides a full team — strategists, copywriters, designers, and developers — for ongoing execution. Consultants work best for brands with internal teams that need direction; agencies work best for brands that need hands-on management. See our full guide on Klaviyo consultant vs. agency for a detailed comparison.

How do I know if my brand needs a Klaviyo agency?

You likely need a Klaviyo agency if: your email revenue is below 30% of total revenue, you're sending campaigns but haven't built automated flows, your list is growing but conversions are flat, you're spending more than 10 hours per week on email internally, or you've outgrown DIY templates and need professional creative and strategy. Brands doing $500K+ in annual revenue typically see the strongest ROI from agency partnerships.

What results should I expect from a Klaviyo agency?

A competent Klaviyo agency should deliver measurable improvements within 60–90 days. Expect email revenue to reach 25–40% of total revenue, automated flow revenue to outpace campaign revenue, open rates of 40%+ on flows, and clear revenue-per-recipient benchmarks. According to Klaviyo's 2026 benchmarks, the average return per recipient for automated flows is $1.94, while top performers achieve $16.96.

Can a Klaviyo agency help with SMS marketing too?

Yes — most top Klaviyo agencies now offer SMS marketing alongside email, since Klaviyo natively supports both channels. Integrated email and SMS strategies consistently outperform single-channel approaches, with SMS adding click-through rates of 19–35% to complement email engagement.

What's the ROI of hiring a Klaviyo email marketing agency?

Email marketing delivers an average ROI of $36 for every $1 spent, making it one of the highest-return marketing channels available. When managed by a skilled agency with proper flow architecture and segmentation, that figure can climb significantly higher. Abandoned cart flows alone earn an average of $3.65 per recipient — and the top 10% achieve $28.89.