Best Klaviyo Agencies for eCommerce Brands [2026]

Here's a stat that should bother you: the average eCommerce brand is leaving 30-40% of its email revenue on the table. Not because Klaviyo can't do the job. Because whoever set up the account didn't know what they were doing.

We see it every week. A brand signs up for Klaviyo, connects it to Shopify, turns on the default Welcome Series, and calls it done. Maybe they hired a freelancer who built a couple of flows from templates. Six months later they're wondering why email only accounts for 15% of revenue when the benchmark is 30-40%.

The fix isn't another YouTube tutorial. It's finding someone who lives inside Klaviyo accounts every single day and knows exactly which levers to pull for your specific store. That's what this list is for.

If You're in a Hurry

Our top pick: GOSH Digital — Klaviyo Gold Partner, 150+ eCommerce clients, $23M+ in tracked revenue. We specialize in high-performing flows, advanced segmentation, and tying every dollar of email revenue back to specific campaigns. Book a free audit here.

But every brand is different. So we ranked 7 agencies that do genuinely good Klaviyo work — and broke down who's best for what.

How We Evaluated These Agencies

We didn't just Google "best Klaviyo agency" and rewrite the top results. Here's how we built this list:

• Klaviyo Partner status — Are they certified? Gold, Silver, or just claiming it? Partner status means Klaviyo has vetted their work.
• Client results with receipts — Case studies with real numbers, not vague claims about "increased engagement."
• eCommerce focus — Klaviyo is built for eCommerce. An agency that also does B2B SaaS newsletters is spreading itself thin.
• Flow architecture — Anyone can build a Welcome Series. We looked for agencies that build 12-20+ flows including Browse Abandonment, Price Drop, Winback, Sunset, Post-Purchase Cross-Sell, VIP Exclusives, and Replenishment.
• Deliverability knowledge — If an agency can't explain sender reputation, dedicated sending domains, or inbox placement testing, run.
• Reporting tied to revenue — Open rates are vanity. Revenue per recipient, attributed revenue per flow, and list growth rate are the metrics that matter.

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The 7 Best Klaviyo Agencies for 2026

1. GOSH Digital — Best Overall for eCommerce Email & SMS

Best for: DTC and eCommerce brands doing $500K-$50M in annual revenue who want email/SMS to become their highest-ROI channel

Pricing: Custom — typically $2,500-$8,000/month depending on list size and scope

Key strength: Flow architecture and revenue attribution. Every flow ties back to dollars, not vanity metrics.

We built GOSH Digital from the ground up around eCommerce email and SMS. Before we ever touched paid media or SEO, we were inside Klaviyo accounts 12 hours a day building flows, running A/B tests, and obsessing over deliverability. That DNA is still in everything we do. As a Klaviyo Gold Partner, we've worked with 150+ eCommerce brands across fashion, beauty, supplements, food & beverage, home goods, and fitness. The total revenue we've helped drive through Klaviyo alone is north of $23 million — and that number only counts what's directly attributed in the platform.

What makes us different from other Klaviyo agencies is our approach to flow architecture. Most agencies build the standard 5-6 flows (Welcome, Abandoned Cart, Browse Abandonment, Post-Purchase, Winback, Sunset) and move on. We build 15-20+ flows per account because we've learned that the money is in the micro-moments. A Price Drop flow that triggers when a browsed product goes on sale. A Replenishment flow timed to when a consumable product runs out. A VIP Anniversary flow that re-engages your best customers with exclusive access. These aren't gimmicks — they're revenue that other agencies leave on the table. Our segmentation goes deep too. We don't just split by "engaged" vs. "unengaged." We build behavioral segments based on purchase frequency, average order value, product category affinity, browse behavior, and predicted lifetime value. Then we write campaigns specifically for each segment. The result? Our clients typically see 40-60% of total revenue coming from email and SMS within 90 days of working with us.

And we're obsessive about deliverability. We set up dedicated sending domains, warm IP addresses properly, monitor inbox placement with Litmus and GlockApps, and run regular list hygiene passes. Because none of the fancy flows matter if your emails land in spam.

Book a free Klaviyo audit with our team.

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2. Flowium — Best for Brands Wanting a Methodical, Process-Driven Approach

Best for: Mid-market eCommerce brands ($1M-$20M revenue) who want a structured methodology

Pricing: Starts around $3,000/month

Key strength: Their documented "Flowium Method" — a step-by-step framework they follow for every client.

Flowium has built a solid reputation in the Klaviyo ecosystem by being extremely process-oriented. They follow a structured methodology for every client engagement: audit, strategy, build, optimize, repeat. If you're the kind of brand owner who wants to see a detailed playbook before anyone touches your account, Flowium delivers that.

They're strong on flow creation and have a library of proven templates they adapt for each brand. Their team publishes good content about Klaviyo best practices, and they're transparent about their process. The downside? They tend to be more templated in their approach, which works well for brands at a certain stage but can feel limiting for larger accounts that need highly custom segmentation and creative strategy.

3. Hustler Marketing — Best Budget Option for Smaller Stores

Best for: Early-stage eCommerce brands ($100K-$2M revenue) looking for affordable Klaviyo management

Pricing: Starts around $1,500-$2,500/month

Key strength: Accessibility. They've built packages specifically for smaller Shopify stores that aren't ready for a $5K/month retainer.

Hustler Marketing fills an important gap in the Klaviyo agency world. A lot of shops doing $500K-$2M in revenue can't justify a $5,000/month email agency — but they also can't afford to leave their Klaviyo account half-built. Hustler offers entry-level packages that cover the essential flows and basic campaign management.

Their work is solid if not spectacular. You'll get the core flows built correctly, basic segmentation, and regular campaign sends. But don't expect advanced predictive analytics, custom Klaviyo integrations, or sophisticated A/B testing programs. They're a good starting point, and brands often graduate to a more specialized agency once they scale past $3-5M.

4. SmartBug Media — Best for HubSpot-to-Klaviyo Migrations

Best for: Brands transitioning from HubSpot or other platforms to Klaviyo, especially those with complex tech stacks

Pricing: $5,000-$15,000/month (they're a larger agency with broader service offerings)

Key strength: Technical migrations and CRM integrations. If your Klaviyo needs to talk to a dozen other tools, SmartBug can wire it up.

SmartBug is a big agency — they do a lot more than Klaviyo. That's both their strength and their weakness. On the plus side, they have deep technical chops. If you need Klaviyo integrated with your ERP, your loyalty program, your custom data warehouse, and three other tools, SmartBug has the engineering team to make it happen. They're also strong at platform migrations, so if you're moving off Mailchimp, HubSpot, or Bronto (rest in peace), they know how to migrate without losing data or tanking deliverability. The downside is that Klaviyo is one of many things they do. You might not get a team that eats, sleeps, and breathes Klaviyo the way a specialist agency does. And their pricing reflects their size — expect to pay a premium for the bigger-agency experience.

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5. Chronos Agency — Best for High-Volume International Brands

Best for: Global eCommerce brands doing $10M+ that need multi-market email strategies

Pricing: $4,000-$10,000/month

Key strength: International eCommerce experience. They understand localization, timezone-based sending, and multi-currency flows.

Chronos Agency has carved out a strong niche working with larger eCommerce operations, particularly brands selling across multiple countries. They understand the nuances of sending emails across different markets — timezone optimization, localized content, currency switching in dynamic blocks, and compliance across different jurisdictions (GDPR, CAN-SPAM, Australian spam laws, etc.).

If you're a single-market DTC brand in the US, Chronos might be more firepower than you need. But if you're selling across the US, UK, Australia, and the EU — and you need your Klaviyo account to handle all of that cleanly — they're worth a serious look.

6. Email Mavlers — Best for High-Volume Email Production

Best for: Brands that need a lot of email templates designed and coded quickly

Pricing: Project-based, starting around $500 per email template; retainers from $1,500/month

Key strength: Speed and volume. If you need 30 email templates built in a month, they can do it.

Email Mavlers is more of an email production house than a strategic Klaviyo agency. That's an important distinction. They're excellent at taking a design brief and turning it into pixel-perfect, responsive email templates fast. Their team is large (200+ people), which means they can handle high-volume production work that smaller agencies can't.

Where they fall short is on strategy. They'll build what you ask them to build, but they won't tell you that your segmentation is wrong or that you're missing a critical flow. If you already have a strong email marketing strategist in-house and just need execution muscle, Mavlers is a great fit. If you need someone to own the whole strategy, look elsewhere.

7. Retention.com — Best for List Growth & Identity Resolution

Best for: Brands focused on growing their email list through identity resolution technology

Pricing: Starts around $500/month for their platform; agency services are additional

Key strength: Their identity resolution technology that captures anonymous website visitors and adds them to your Klaviyo flows.

Retention.com isn't a traditional Klaviyo agency — they're more of a technology platform with services attached. Their core product uses identity resolution to identify anonymous visitors on your website and feed them into your Klaviyo flows. In practice, this can dramatically increase the number of people entering your Browse Abandonment and Abandoned Cart flows.

The technology works. We've seen brands double their flow revenue by adding Retention.com's identity data to Klaviyo. But there are caveats. The data quality varies. Some of the captured emails have low engagement, which can hurt deliverability if you're not careful about list hygiene. And their agency services (strategy, flow building, campaign management) aren't as deep as a dedicated Klaviyo shop. Think of them as a powerful add-on to your Klaviyo strategy, not a replacement for a full-service email agency.

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How to Choose the Right Klaviyo Agency

Picking a Klaviyo agency isn't complicated if you know what to look for. Here's the framework we'd use:

1. Check Their Klaviyo Partner Status

Klaviyo certifies agencies at different tiers based on client results and platform expertise. Gold and Platinum partners have been vetted. Non-partners might still be good — but you're taking on more risk.

2. Ask for Revenue Numbers, Not Open Rates

Any agency can inflate open rates by only emailing engaged subscribers. Ask: "What percentage of total revenue comes from email and SMS for your average client?" Good agencies drive 30-40%. Great ones push past 40%.

3. Count Their Flows

Ask how many flows they typically build per account. If the answer is 5-6, they're doing the basics. If it's 12-20+, they understand where the real money is. Each flow is a revenue opportunity that runs 24/7 — more flows means more automated revenue.

4. Ask About Deliverability

If they can't explain their deliverability monitoring process — inbox placement testing, dedicated sending domains, list hygiene cadence, sunset flow logic — they're going to cost you money in the long run when your emails start hitting spam.

5. Look at Their Reporting

Do they send you Klaviyo screenshots? Or do they build custom dashboards that tie email revenue to overall business performance? The best agencies make their impact crystal clear every month.

6. Understand the Pricing Model

Most good Klaviyo agencies charge $2,500-$8,000/month for full-service management. If someone's quoting $500/month, they're either cutting corners or outsourcing to a team that doesn't know your brand. And if they're quoting $15,000+, make sure you're getting proportional value.

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Ready to See What Your Klaviyo Account Is Missing?

We offer a free Klaviyo audit for eCommerce brands doing $500K+ in annual revenue. No pitch deck, no "let me check with my team" runaround. You'll get on a call with someone who's been inside hundreds of Klaviyo accounts, and we'll walk through exactly what's working, what's broken, and what revenue you're leaving behind.

Book your free Klaviyo audit here.

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Mark Cijo is the founder of GOSH Digital, a Klaviyo Gold Partner agency that's helped 150+ eCommerce brands drive $23M+ in revenue through email and SMS marketing. He's based in Dubai and works with brands globally.