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Looking for the best Klaviyo email marketing agency for your brand to level up your brand’s growth?
Propel, Flowium, Chronos Agency, Andzen, and InboxArmy are top choices for outsourcing Klaviyo - perfect for brands that want hands-off, expert-driven email and SMS marketing that actually delivers results.
They build smarter automations, target campaigns, and keep optimizing to drive real revenue and retention.
But what sets the very best Klaviyo agencies apart?
It’s not just certifications or big promises. The standout partners have a track record of proven ROI, advanced segmentation, creative strategy, and deep expertise in lifecycle automation.
The highest-rated agencies are those able to implement complex workflows, leverage first-party data for personalization, and continually refine campaigns with performance analytics - helping brands consistently outperform typical benchmarks.
Curious which agencies made the list and what exactly makes them elite? Read on and find the right Klaviyo agency partner for your next marketing breakthrough.
Here’s a shortlist of the top-performing Klaviyo agencies you should consider:
Propel – Trusted Klaviyo agency for lifecycle marketing, LTV attribution, and retention strategy at scale.
Flowium – Full-service automation agency focused on Klaviyo and email execution from strategy to send.
Chronos Agency – SMS and post-purchase flow experts with deep experience in ecommerce retention.
Andzen – Specialists in building cohesive customer journeys across email, SMS, and web touchpoints.
InboxArmy – Best suited for high-volume senders who need scalable, enterprise-grade email operations.
Most high-performing Klaviyo email marketing agencies provide services across the entire lifecycle marketing spectrum:
What really sets top-tier Klaviyo agencies apart? It’s not badges, templates, or pretty dashboards. It’s results.
The best agencies drive retention, lift LTV, and turn flows into revenue machines - consistently, across industries. They don’t just “know Klaviyo.” They know how to make it work for your exact lifecycle stage, tech stack, and growth goals.
If you’re done guessing and ready to work with real experts, keep reading. These are the Klaviyo email marketing agency that actually move the needle:
Propel is a Klaviyo-certified email marketing agency focused on advanced lifecycle automation, AI-driven segmentation, and full-funnel retention strategies. As a top Klaviyo email marketing agency, Propel helps DTC, subscription, and ecommerce brands turn customer journeys into predictable revenue.
Unlike most agencies that stop at welcome flows and abandoned carts, Propel builds dynamic, data-backed systems across the entire lifecycle. Their team combines Klaviyo expertise with behavioral analytics and AI tools to deliver personalization that actually converts - and scales.
Brands ready to move past basic automation and invest in a serious retention system. Propel is ideal for teams who want a strategic Klaviyo email marketing agency that can unlock scalable growth, not just manage sends.
Flowium is a Klaviyo Partner and full-service email and SMS marketing agency built for high-growth ecommerce brands. As a trusted Klaviyo email marketing agency, Flowium handles everything from strategy and segmentation to execution - so you don’t have to.
Flowium is known for turnkey execution. They manage the entire Klaviyo ecosystem - strategy, setup, content, and optimization - making them a go-to for teams that want growth without micromanagement. Their plug-and-play approach removes friction and frees up internal bandwidth.
Fast-growing ecommerce brands that want a dependable Klaviyo email marketing agency to fully manage lifecycle automation with minimal oversight. Flowium is ideal for teams who want results without getting into the weeds.
Chronos Agency is a globally recognized Klaviyo email marketing agency known for its deep expertise in SMS and behavior-based lifecycle automation. They help ecommerce brands build high-converting post-purchase and retention journeys that drive repeat revenue.
Chronos goes beyond standard flows. Their team focuses on building systems that maximize customer lifetime value - using smart segmentation, omnichannel messaging, and data-backed timing to increase retention at every stage of the customer journey.
Ecommerce brands in beauty, wellness, or fashion with strong repeat purchase potential. Chronos is ideal for teams that want a Klaviyo email marketing agency focused on long-term customer engagement - not just quick wins.
Andzen is a Klaviyo Partner known for crafting personalized customer journeys that scale. As a specialist Klaviyo email marketing agency, Andzen blends creative strategy with technical execution across email, SMS, and loyalty integrations.
Andzen’s strength lies in journey-based segmentation - mapping every interaction to lifecycle stage and intent. They’re experts at integrating Klaviyo with CRMs, loyalty tools, and customer data platforms to deliver seamless, context-rich communication.
Brands looking to elevate their customer experience through thoughtful, personalized communication. Andzen is ideal for teams that want a Klaviyo email marketing agency with both creative depth and technical know-how.
InboxArmy is a Klaviyo email marketing agency built for scale. With a background in enterprise email operations, they specialize in managing large-volume campaigns, complex segmentation, and repeatable workflows across ecommerce and B2C brands.
InboxArmy isn’t just fast - they’re built for operational efficiency. Their team handles high-frequency sends, detailed QA, and rapid deployment without compromising deliverability or design. It’s a plug-and-play solution for brands with big lists and aggressive calendars.
Mid-to-enterprise brands that need a Klaviyo email marketing agency to handle production at scale. InboxArmy is ideal for teams with frequent sends, large lists, and a need for reliable execution without in-house overhead.
Working with a top Klaviyo agency isn’t just about outsourcing emails - it’s about turning your retention strategy into a revenue engine. Here’s how to get the most out of your partnership and unlock real ROI from every customer lifecycle touchpoint.
Set clear revenue, LTV, and retention goals before launching any flows or campaigns. A great Klaviyo agency should work backward from business outcomes - not just inbox volume - so every message has a measurable purpose.
Before building new automations, your Klaviyo agency should map the full customer experience. Journey audits help uncover leaks, friction points, and overlooked moments that can be optimized for retention and repeat purchases.
Give your agency full access to first-party data, event triggers, and product usage insights. The more behavioral data they can work with, the more personalized - and effective - your Klaviyo email and SMS campaigns will be.
Don’t silo email and SMS. Your Klaviyo agency should help run coordinated, multichannel tests - like staggered promos, win-back timing, or split-channel product drops - to learn what actually drives conversion and loyalty.
Retention isn’t a set-it-and-forget-it game. Set up monthly reporting check-ins and run deeper strategic reviews every quarter to keep up with evolving customer behavior, deliverability shifts, and performance trends.
Finding the right Klaviyo email agency isn’t just about certifications - it’s about fit. The ideal agency should align with your growth goals, internal bandwidth, and need for strategic execution.
Absolutely - but only if you use it right.
As of March 31, 2025, Klaviyo had over 169,000 paying customers, up from 146,000 in Q1 2024. This includes 3,030 customers generating more than $50,000 in annual recurring revenue, which grew 40% year-over-year. [Source - Klaviyo News]
Klaviyo isn’t just “good” for email marketing. It’s purpose-built for ecommerce brands that care about lifecycle growth, retention, and owned-channel revenue. With native integrations, powerful segmentation, and flexible automation, Klaviyo gives you the tools to build real relationships with your customers - not just blast promotions.
But like any powerful tool, Klaviyo’s success depends on how you use it. If you’re only scratching the surface with basic flows and default templates, you’re leaving serious revenue on the table.
That’s where the right Klaviyo Email Marketing Agency comes in - one who understands data, customer journeys, and what drives repeat purchases in your specific market.
So yes - Klaviyo is more than good. With the right strategy and expert execution, it can be your most profitable marketing channel.
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Klaviyo is trusted by thousands of ecommerce and DTC brands - from fast-growing startups to well-established names in beauty, fashion, wellness, and home goods. It’s especially popular among brands that prioritize lifecycle marketing and owned-channel growth.
Klaviyo is a marketing automation platform that helps brands send personalized email and SMS campaigns. It enables audience segmentation, behavior-based triggers, and automated flows designed to increase revenue and customer retention.
Klaviyo functions primarily as an ESP (Email Service Provider), but it includes built-in CRM-style features. That means brands can manage customer data, segment audiences, and automate messages - all within one platform.
Klaviyo’s popularity comes from its ease of use, visual flow builder, ecommerce integrations (like Shopify and WooCommerce), and strong performance across retention metrics. It’s ideal for teams that want powerful automation without needing developers.
Propel is widely considered the best Klaviyo partner for brands seeking advanced lifecycle strategy, AI-driven segmentation, and serious retention performance. Other strong players include Flowium, Chronos, Andzen, and InboxArmy, each with specific areas of expertise.
Costs vary depending on services and scope. A smaller agency may charge $1,500 - $5,000/month, while full-service Klaviyo partners offering flows, campaigns, reporting, and testing typically range from $3,000–$10,000+ per month. You've got some affordable lifecycle marketing agencies that can help best with lower budget.
The best email marketing company depends on your goals. For Klaviyo users focused on lifecycle growth, Propel stands out as a data-driven, retention-first agency that delivers measurable ROI.
Use our free Retention Impact Calculator to see how much revenue you’re leaving on the table — and how much you could unlock by improving retention.
👉 Calculate My Impact