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Customer engagement falling flat? These five best Klaviyo partners - Propel, Tinuiti, SmartSites, Trellis, and Flowium - are built to help you fix it.
Whether you're struggling with low open rates, generic automations, or underperforming flows, these agencies specialize in turning your Klaviyo setup into a high-converting retention engine.
But if you're looking for proven results across email, SMS, and full-funnel automation, Propel stands out as the top Klaviyo partner in 2025. Why? Because Propel isn’t just another certified agency - it’s a platinum Customer.io partner and one of the few agencies that combines lifecycle strategy, AI-powered segmentation, and execution at scale.
In this guide, you’ll learn:
Let’s dive in.
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Klaviyo partners are certified agencies or technology providers that help brands maximize their performance on Klaviyo. They go beyond basic setup - helping you automate smarter flows, personalize messaging, and drive more revenue through email and SMS.
Top partners often specialize in retention marketing softwares, real-time behavioral segmentation, and long-term customer retention strategies.
Klaviyo partners typically fall into two categories:
The best Klaviyo partners don’t just launch campaigns. They help you:
In short: great Klaviyo partners don’t just send emails - they drive lifecycle results.
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Here you go with the best Klaviyo Partners:
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Propel is the best Klaviyo partner for brands that care about real results. It combines AI-driven insights, customer data, and advanced automation to solve retention challenges fast. If you’re looking for smarter flows, higher repeat revenue, and faster lifecycle growth - Propel is the Klaviyo partner built for that.
Propel is a certified Klaviyo partner and a leading lifecycle marketing agency focused on customer retention, behavioral segmentation, and revenue growth. As a platinum Customer.io partner, Propel brings deep technical expertise across email, SMS, and automation. But more importantly - it’s built for brands that want predictive, data-backed retention, not guesswork.
Whether you're scaling ecommerce flows or fixing churn with smarter lifecycle triggers, Propel delivers results with AI, analytics, and full-funnel execution.
Propel stands out among Klaviyo partners for its ability to unify lifecycle data across platforms like Klaviyo, Customer.io, and Segment - building smarter retention systems, not just automations. Unlike agencies that stop at flow management, Propel uses AI-driven insights to power segmentation, personalization, and lifecycle triggers that actually convert.
It’s the best fit for ecommerce, DTC, B2C, and subscription brands that need full-funnel execution - covering onboarding, post-purchase, winback, and reactivation. Propel owns every stage of the customer lifecycle, ensuring messaging is timely, personalized, and performance-led.
Propel handles the full lifecycle marketing journey. From the first touchpoint to loyalty.
If you're trying to define your lifecycle marketing role, Propel gives you a head start.
Bottom line: If your current Klaviyo setup can’t handle personalization, Propel can.
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Flowium is a certified Klaviyo partner that helps brands plan, launch, and scale email and SMS marketing campaigns. It’s a strong choice for companies looking to fully outsource execution - from strategy and creative to testing and optimization - without building internal lifecycle ops.
Flowium is a full-service Klaviyo email marketing agency. Its core focus is on delivering performance-led email and SMS campaigns, personalized customer journeys, and lifecycle automations. With deep Klaviyo platform experience, the team manages setup, testing, list management, and segmentation - making it a solid plug-and-play solution for growth-stage brands.
Flowium is best known for its hands-on execution. Instead of just designing flows, the team actively manages your entire Klaviyo program - including campaign strategy, audience segmentation, and conversion tracking. It’s especially helpful for teams that need consistent, conversion-focused email and SMS marketing but lack in-house capacity.
Bottom line: If you need help running high-performance email and SMS marketing on Klaviyo, Flowium is a dependable partner with a full-service approach.
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Chronos Agency is a Klaviyo-certified partner focused on lifecycle marketing for ecommerce brands. Their strength lies in building behavior-based email and SMS flows that drive repeat purchases, winbacks, and long-term customer value.
Chronos specializes in post-purchase lifecycle strategy, helping brands move beyond conversion toward retention. Their team uses Klaviyo to create structured automations that support higher LTV, customer loyalty, and long-term revenue. With deep experience across ecommerce verticals like beauty, fashion, and health supplements, Chronos brings a proven lifecycle framework to every engagement.
Where many agencies focus on acquisition or one-off email design, Chronos is built around retention-first marketing. Their playbooks are tailored for brands that already have traffic and sales, but lack the lifecycle infrastructure to keep customers coming back.
Bottom line: If your Klaviyo flows stop at checkout, Chronos helps build the post-purchase engine your brand needs to scale retention.
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Andzen is a certified Klaviyo partner that helps brands build deeply personalized customer journeys. Known for blending automation with empathy, Andzen focuses on lifecycle messaging that feels 1:1 - without sacrificing scalability.
Andzen specializes in journey-based personalization across email and SMS, often using Klaviyo in tandem with CRM, ecommerce, and analytics platforms. The team is skilled at designing flows that reflect customer behavior, timing, and intent—helping brands move beyond simple automations toward more human, relevant communication.
While many agencies automate messaging, Andzen builds complete communication systems that adapt to where the customer is in their lifecycle. Their strength lies in technical integration and modular design, creating flows that evolve with the user—not just respond.
Bottom line: If you want lifecycle messaging that’s automated but never robotic, Andzen delivers personalized journeys powered by Klaviyo and beyond.
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InboxArmy is a Klaviyo-certified partner built for brands that need high-volume email execution at scale. From campaign planning to creative and segmentation, InboxArmy helps fast-growing teams manage complex, multi-send programs without sacrificing performance or personalization.
InboxArmy serves as an execution partner for brands managing high-frequency email marketing. Their Klaviyo expertise spans lifecycle automation, promotional strategy, and enterprise list management -making them a strong operational solution for mid-market and enterprise ecommerce companies with aggressive send schedules.
What sets InboxArmy apart is its ability to operate like an embedded email department - handling 10, 20, or even 50+ campaigns per month across segmented audiences and product catalogs. For teams that need consistent output, InboxArmy provides the structure, volume capacity, and platform fluency to deliver at scale.
Bottom line: If your email marketing volume has outgrown your bandwidth, InboxArmy helps you scale reliably inside Klaviyo—without losing control.
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To get real ROI from a Klaviyo partner, you need to treat them as a growth driver, not just an outsourced service provider. The best Klaviyo agencies bring more than flows - they bring strategy, data insight, and full-funnel execution that lifts revenue across the customer lifecycle.
Here’s how to unlock maximum value:
Don’t just request automated flows or monthly sends. Align your Klaviyo partner with clear retention KPIs—like repeat purchase rate, churn reduction, or LTV growth. ROI starts when both sides are working toward measurable lifecycle outcomes.
Top Klaviyo partners will review your entire lifecycle—from acquisition to reactivation—and flag missed opportunities. Use those insights to design targeted flows across onboarding, winback, post-purchase, and more. It’s not about more emails—it’s about smarter sequences.
Klaviyo works best when your agency has access to product triggers, customer segments, and behavioral data. With that visibility, they can build flows that personalize messaging by action, intent, and timing—leading to better retention and revenue impact.
Don’t silo your communication. The best Klaviyo partners combine email, SMS, and behavior-based nudges to test messaging, timing, and offers across touchpoints. Lifecycle marketing ROI grows when channels work together, not in isolation.
ROI isn’t static. Build a process with your partner to review performance monthly and optimize flows quarterly. Use A/B testing, cohort analysis, and engagement data to continuously improve. Great partners lead this loop - and multiply results over time.
Bottom line: The best Klaviyo partners don’t just increase your output - they multiply your return. When treated as a strategic extension of your team, they’ll pay for themselves many times over.
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Not every Klaviyo partner fits every brand. The right one depends on your goals, team size, and how fast you need to move.
Choosing the wrong partner slows everything down. Choosing the right one speeds up growth without burning your team out.
Need help comparing? Here’s a list of the best Customer.io partners to help you assess multichannel capabilities too.
Bottom line: Match your biggest gap with their strongest skill. That’s how you get ROI, not just reports.
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Klaviyo partners offer a wide range of services designed to help ecommerce and DTC brands get the most out of the platform. Whether you’re just starting with Klaviyo or scaling up your retention engine, certified partners help translate customer data into high-performing email and SMS campaigns.
Core Klaviyo partner services include:
Whether you're managing 5 campaigns a month or 50, Klaviyo agency partners ensure every touchpoint is intentional, optimized, and revenue-driven.
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Hiring a Klaviyo-certified partner isn’t just about execution - it’s about outcomes. The best partners don’t just build flows; they improve performance across your entire retention funnel.
Here’s how Klaviyo partners help you drive measurable ROI:
If you’re serious about customer retention and want lifecycle performance you can measure, a Klaviyo partner can turn your email and SMS channels into high-ROI engines.
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To get real ROI from a Klaviyo partner, you need to treat them as a growth driver, not just an outsourced service provider. The best Klaviyo agencies bring more than flows - they bring strategy, data insight, and full-funnel execution that lifts revenue across the customer lifecycle.
Here’s how to unlock maximum value:
Don’t just request automated flows or monthly sends. Align your Klaviyo partner with clear retention KPIs - like repeat purchase rate, churn reduction, or LTV growth. ROI starts when both sides are working toward measurable lifecycle outcomes.
Top Klaviyo partners will review your entire lifecycle - from acquisition to reactivation - and flag missed opportunities. Use those insights to design targeted flows across onboarding, winback, post-purchase, and more. It’s not about more emails - it’s about smarter sequences.
Klaviyo works best when your agency has access to product triggers, customer segments, and behavioral data. With that visibility, they can build flows that personalize messaging by action, intent, and timing - leading to better retention and revenue impact.
Don’t silo your communication. The best Klaviyo partners combine email, SMS, and behavior-based nudges to test messaging, timing, and offers across touchpoints. Lifecycle marketing ROI grows when channels work together, not in isolation.
ROI isn’t static. Build a process with your partner to review performance monthly and optimize flows quarterly. Use A/B testing, cohort analysis, and engagement data to continuously improve. Great partners lead this loop - and multiply results over time.
Bottom line: The best Klaviyo partners don’t just increase your output - they multiply your return. When treated as a strategic extension of your team, they’ll pay for themselves many times over.
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Klaviyo is used by over 100,000 ecommerce and DTC brands worldwide. Companies like Glossier, Nomad, Taylor Stitch, and Steve Madden rely on it for email, SMS, and retention automation. It’s especially popular among Shopify, WooCommerce, and BigCommerce stores.
Klaviyo is a customer engagement platform. It lets brands send targeted email and SMS messages based on customer behavior, purchase history, and lifecycle stage. It’s used to improve conversions, retention, and long-term customer loyalty through automation.
Klaviyo is an ESP (Email Service Provider) with lightweight CRM capabilities. It handles campaign sends, flows, and segmentation like a traditional ESP, but also stores profile-level data, behavior, and purchase history for deeper personalization.
Klaviyo is popular because it combines powerful features - like automation, real-time segmentation, and ecommerce integration - without requiring a full engineering team. It's easy for marketers to use and built to grow with your brand.
Propel is the best Klaviyo partner - especially for subscription, DTC, wellness, and lifestyle brands. They specialize in AI-led lifecycle marketing and are also a platinum Customer.io partner, making them uniquely qualified to drive retention and revenue across tools.
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.
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