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Customer engagement falling flat? These 5 Klaviyo partners can help: Propel, Tinuiti, SmartSites, Trellis, and Flowium.
But if you want proven results with email, SMS, and automation - Propel stands out as the best. Why? Because Propel is not only a top lifecycle agency - it’s also a platinum Customer.io partner, known for delivering high-impact engagement at every stage.
This guide breaks down:
Klaviyo partners are agencies or tools that help brands get better results from Klaviyo.
They boost customer engagement, automate smart flows, and drive more revenue from email and SMS.
Klaviyo partners fall into two groups:
The right partner doesn’t just help you set up campaigns - they help you track behavior, personalize flows, and stop churn before it starts.
Top partners often specialize in retention marketing softwares, real-time behavioral segmentation, and long-term customer retention strategies.
In short: good Klaviyo partners don’t just send emails - they drive results.
Here you go with the best Klaviyo Partners:
Propel is the best Klaviyo partner for brands that care about results. It uses AI, data, and automation to fix retention, fast. If you want faster growth and smarter flows - Propel is the partner.
Who is Propel?
Propel is a lifecycle marketing and customer retention agency and platinum Customer.io partner.
But that’s just the start. It’s also Klaviyo-certified and built for brands that want predictive retention - not guesswork.
Why it’s the best Klaviyo partner:
Propel connects the dots across Klaviyo, Customer.io, and Segment. It doesn’t just manage flows - it powers them with AI-led insights. That’s what sets it apart from other partners claiming to offer data-driven growth.
Propel works for subscription brands, DTC, B2C, and e-commerce brands. Propel handles end-to-end communication at every lifecycle touchpoint of the user.
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.
Flowium is a Klaviyo partner that builds, runs, and scales email and SMS marketing. It’s ideal for brands that want end-to-end service - from strategy to execution.
Flowium is a full-service Klaviyo agency. It focuses on email marketing, SMS campaigns, and lifecycle messaging. The team builds personalized flows and automations designed to boost revenue and retention.
They specialize in Klaviyo + Flowium integration, giving brands a plug-and-play team for setup, testing, and optimization.
Flowium’s campaigns are built to hit every stage of the customer lifecycle, not just drive short-term opens.
Bottom line: If you need help scaling email and SMS with Klaviyo, Flowium delivers.
Chronos Agency helps ecommerce brands turn repeat buyers into long-term revenue. It’s a Klaviyo-certified partner focused on email, SMS, and retention-first growth.
Overview
Chronos is best known for its lifecycle marketing playbooks. The agency runs full-funnel flows aimed at improving retention, not just conversions. With Klaviyo + Chronos integration, brands get structured automation - built for repeat sales, winbacks, and higher LTV. They’re particularly strong at identifying friction in the post-purchase journey and fixing it with behavior-based messaging.
Key Services
What Makes Them Stand Out
Ideal For
Founders or marketers who have traffic and sales - but no retention engine. Chronos is ideal when you need full lifecycle support without hiring a growth team.
Andzen helps brands make every message feel 1:1. As a certified Klaviyo partner, their edge lies in building personalized experiences that scale without losing the human touch.
Overview
Andzen designs customer journeys that blend automation with empathy. Their Klaviyo + Andzen collaboration often includes cross-platform integrations, pulling in data from CRMs, ecommerce tools, and analytics platforms to shape behavior-based flows. Email and SMS are used together - based on how, when, and why customers act.
Key Services
What Makes Them Stand Out
Ideal For
Brands that care about customer experience as much as revenue. Especially useful for teams that want high-touch, low-noise communication across long buying cycles.
InboxArmy is built for scale. As a Klaviyo partner, it helps large and fast-growing brands manage high-volume email programs without losing control or quality.
Overview
InboxArmy supports brands that need speed and structure across thousands of emails a week. Their Klaviyo + InboxArmy integration gives you campaign strategy, list management, creative execution, and reporting - all under one team. They’re especially strong at operationalizing email for mid-market and enterprise ecommerce brands.
Key Services
What Makes Them Stand Out
Ideal For
Brands that need a high-output email team - but don’t want to build one in-house. InboxArmy is especially effective for marketers managing 10+ sends per month, across varied segments or product lines.
Not every Klaviyo partner fits every brand. The right one depends on your goals, team size, and how fast you need to move.
Start by asking:
Here’s what to look for:
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.
To get real ROI from a Klaviyo partner, treat them like a growth lever - not a service vendor. That means using their full stack of expertise across data, creative, and strategy.
Here’s how to make the partnership count:
Bottom line: Great partners multiply your return - not just your output. Use them strategically, and they’ll pay for themselves many times over.
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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