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Propel, Flowium, Chronos Agency, Andzen, and InboxArmy are top Klaviyo Agency for Email Marketing - perfect for brands that want hands-off, expert-driven email and SMS marketing that actually delivers results.
These Klaviyo agencies don’t just “run campaigns” - they design hands-off, expert-driven email and SMS marketing that fuels revenue and retention. From smarter automations to precise segmentation and ongoing optimization, they help brands unlock Klaviyo’s full power.
But here’s the real question: what separates a good Klaviyo agency from a great one?
It’s not just flashy certifications or bold promises. The top Klaviyo agency partners have a proven track record of ROI, advanced lifecycle strategies, and the ability to personalize at scale using first-party data. They know how to build complex workflows, run constant testing, and turn analytics into revenue-driving action.
In this 2025 guide, we review the top 5 Klaviyo agencies, break down their specialties and client wins, and show you what truly makes them elite.
Here’s a shortlist of the top-performing Klaviyo agencies you should consider:
Top Klaviyo agency for email marketing delivers end-to-end solutions that fuel ecommerce growth and maximize customer lifetime value. Most high-performing Klaviyo email marketing agencies provide services across the entire lifecycle marketing spectrum:
Klaviyo Email Agencies handle full onboarding: account creation, template migration, domain authentication, and seamless integration with ecommerce platforms such as Shopify, WooCommerce, or Magento.
From welcome series to post-purchase, abandoned cart, win-back, and reactivation flows, a Klaviyo agency builds and optimizes automated journeys that engage customers at every stage. These flows are powered by real-time, first-party data for personalized, relevant messaging.
Klaviyo Agencies develop robust segmentation strategies based on purchase behavior, customer status, product interests, and predictive analytics, ensuring the right message reaches the right audience.
From creative concept to execution, Klaviyo agencies design on-brand, mobile-optimized email and SMS campaigns, manage ongoing sends, and ensure compliance with regulations.
A top-notch Klaviyo email marketing agency delivers professionally designed templates combined with compelling copy drive higher engagement, clicks, and conversions for every marketing message.
Klaviyo Agencies provide detailed performance dashboards, A/B testing, and actionable insights to continually refine content, timing, and strategy for maximum ROI.
Top Klaviyo Email Agencies connect Klaviyo to loyalty, reviews, SMS, and analytics platforms for unified customer experiences and deeper lifecycle marketing.
Ongoing advisory services in Klaviyo agencies ensure your Klaviyo program evolves alongside your business, with proactive recommendations for growth and retention.
Certified Klaviyo partners bring specialized expertise that empowers your business to achieve more with email and SMS marketing. Instead of managing complex automations and ever-changing best practices yourself, these Klaviyo Agency combines advanced strategy with hands-on execution - so you get the best of both worlds.
They ensure flawless setup, data-driven segmentation, and high-performing campaigns tailored to your goals. The result is smarter, more profitable lifecycle marketing that continuously boosts your revenue, customer retention, and brand loyalty.
By leveraging a certified Klaviyo partner, your marketing goes beyond basic send-outs and unlocks the full power of personalized, automated communications proven to grow your ecommerce business.
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 Reviews and Case Studies
Propel is a Klaviyo-certified email marketing agency in the USA specializing in advanced lifecycle automation, AI-powered segmentation, and full-funnel retention strategies. As one of the top Klaviyo agencies for DTC, subscription, and ecommerce brands, Propel transforms customer journeys into predictable, repeatable revenue. It is the top email marketing company in the USA - especially for Klaiyo email marketing services.
Unlike generic marketing email marketing Klaviyo agencies, Propel focuses exclusively on lifecycle-driven growth - building automated flows, personalized messaging, and data-backed optimizations that consistently outperform industry benchmarks.
Unlike most Klaviyo 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 an ideal Klaviyo marketing company for teams who want a strategic Klaviyo email marketing agency that can unlock scalable growth, not just manage sends.
Flowium is a Klaviyo email expert 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.
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]
Choosing the right Klaviyo agency depends on your brand’s goals, size, and growth priorities. If you want sophisticated lifecycle marketing and retention strategies powered by advanced analytics, Propel is an excellent choice for ecommerce and DTC brands.
Flowium is ideal if you need an all-in-one partner for strategy, campaign management, and automations. Chronos Agency is perfect for ecommerce businesses focused on maximizing customer retention and optimizing post-purchase engagement, while InboxArmy is well-suited for high-volume senders requiring robust technical support and scalable solutions.
Andzen is recommended for businesses that want to create seamless customer journeys across multiple channels, ensuring consistent and personalized brand experiences.
Ultimately, the best Klaviyo Email Marketing Agency is the one whose expertise and approach align with your brand’s unique needs -whether you prioritize data-driven growth, retention, creative omnichannel campaigns, or scalable enterprise-level support. Matching your business stage and goals to an agency’s strengths will help you unlock the full potential of Klaviyo for long-term success.
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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.
A Klaviyo email marketing agency designs, builds, and manages personalized email and SMS flows inside the Klaviyo platform. This includes onboarding sequences, post-purchase follow-ups, and promotional campaigns tied to user behavior.
Klaviyo agencies specialize in ecommerce growth. They understand data feeds like Shopify, product recommendations, browse abandonment logic, and performance tracking - making them more effective for online stores.
Yes. Klaviyo agencies focus on retention revenue - through high-performing flows like abandoned cart, winback, replenishment, and upsell automations - often driving 20–30% of total sales.
DTC brands, Shopify stores, and ecommerce companies doing at least $20K/month in revenue benefit most. These businesses need expert segmentation, automations, and consistent revenue-driving campaigns.
Core KPIs include open rate, click-through rate (CTR), flow conversion rate, revenue per recipient, list growth, and unsubscribe rate - aligned with sales goals and lifecycle stage performance.
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