Klaviyo Agency Partner Directory

Underground Ecom is the Leading eCommerce Retention and Email marketing agency for the US & UK and Klaviyo Partner Of The Year 2025 along with having the highest ranking of Klaviyo Master Elite. Having worked with global leaders from Virgin, Britvic, Huda Beauty, Surreal, Spacegoods, Osprey, Oh Polly, Chilly's and other 8, 9 and 10 figure ecommerce brands, we know what it takes to be ahead of the pack. We specialize in end-to-end management of your Klaviyo account including: • Strategy • Content creation • Split testing & optimization • Technical support • Reporting Our team becomes the CRM arm of your business and integrates deeply with your existing team so you get the benefit of an “in-house experience” with the expertise that comes with working with a specialized agency. If you are looking for an experienced highly specialized team to support your brand in growing email engagement and revenue then book a free audit with our team below to find out where your Klaviyo account can be optimized to increase performance. Schedule a call with our team today using the link below! https://www.undergroundecom.com/thank-you-confirmation/

AMB Interactive specializes in digital marketing with a focus on email, creative design, and copywriting. We position our clients to stay ahead of the competition through growth and retention, providing knowledge of the latest digital trends and guidance from our experience operating e-commerce businesses.

Ecommerce Strategy & Development Agency | Miami, FL Located in the dynamic city of Miami, Florida, and supported by satellite offices in Los Angeles, California, and Lisbon, Portugal, Absolute Web has established itself as a prominent Ecommerce Growth Agency since 1999. Our unwavering commitment to helping businesses achieve and surpass their ecommerce goals is driven by the utilization of cutting-edge technologies, customized development processes, user-centric UI/UX designs, seamless API integrations, and effective digital marketing strategies. Our agency's core strengths include: 1. Shopify Development 2. Magento Development 3. BigCommerce Development 4. Custom Solutions 5. API Integration 6. Replatforming & Data Migration 7. UI/UX Web Design 8. Conversion Rate Optimization 9. Email & SMS Automation 10. Paid Media Marketing 11. Search Engine Optimization

The Working Party design and build best-in-class eCommerce websites on Shopify Plus for retailers with complex technical requirements, who value brand and seek rapid growth through innovation. Our clients are market leaders — pushing boundaries and capitalising on opportunity at home and abroad. Our brand-side experience and empathy for the retailer are unparalleled in the Shopify Plus agency space. We work with brands like yours to accelerate your online sales on Shopify Plus, the world’s best eCommerce platform — but we are not your standard eCommerce agency. After refining our process leading high visibility digital and design transformation projects to create websites millions use every day, we turned our focus to eCommerce - applying the same rigorous process and flawless execution. Our leadership and cross functional team have a wealth of in-house, retail expertise, after working brand side for leading Australian retailers. The culmination of this experience, consolidated in our projects for leading retailers JB Hi-Fi, KOOKAÏ, Assembly Label and Lovisa, speak to our ability to profoundly impact the brands we partner with.

Premium eCommerce marketing services. Partner with specialist channel Directors to achieve your goals. LION stands for Leaders In Our Niche, and we are a team of seasoned and passionate eCommerce marketing specialists driven by performance and focused on providing an exceptional client experience. LION Digital was founded to bridge a gap in the agency landscape filled with just two major types of agencies: generalist agencies that are heavily relying on junior, low experience resources, and specialised agencies, focused on a single channel. Now you can house all your eCommerce marketing vendors under one roof, thanks to the innovative LION’s channel-focused model.

Shopify’s #1 Retention Agency Turning Your Customers into Loyal Fans. We offer a comprehensive email and SMS marketing solution for e-commerce businesses. Our team of experts will work closely with you to create and execute personalized campaigns that drive sales and customer engagement. With our full-service approach, you can replace the need for multiple employees and enjoy the benefits of a dedicated expert team at a fraction of the cost. Thinking about working with us? Complimentary for Qualified Brands: • Migration from any platform over to Klaviyo • Audit, Action plan, and proposal for your brand. Standard Scope of Work: • Team of 6 Experts for You • Competitor Data Analytics (Frequency, Terms, Send Times, Etc.) • Retention Strategy (Customer Journey + Loyalty and Referral) • Creative Implementation, and Reporting • Emails Flows • SMS Flows • Monthly Email + SMS Campaigns • Popup Builds + Optimizations

Colorz is a French digital agency focused on accelerating the growth of online sales for ecommerce brands. • CRM: From the strategy to its implementation, we create sophisticated flows and engaging campaigns with a deep customer data analysis to help capture prospects, nurture leads, and build loyalty from existing customers. • Website : as Shopify Plus Partner, our services include UX/UI, e-shop development, CRO optimization, complex SI integration, app development and more • Design and brand content : We shoot or design engaging creative content for our customers’ digital ecosystem (video, photos, motion design, copywriting…) • Performance Marketing : we build data-driven media campaigns (Facebook, Google, Instagram, Tiktok, native ads…) to reach our clients audience and accelerate traffic and revenue growth.

➽Are you tired of conventional methods that fail to captivate your audience? Ready to discover the secret to truly compelling communication that converts and brings customers back? Look no further! Growth comes down to understanding both the numbers and your audience better and making improvements that ignite your growth. At Polaris we help our partners which are serious about improving their Customer Lifetime Value and growing their business with our services. We're specialized in Klaviyo (and everything that integrates with it), Marketing Automation/Email, Conversion Rate optimization (CRO) and Customer Value optimization (CVO) Not sure what CVO means? Check out these 2 Klaviyo community article by our CEO and Klaviyo Community Champion, Omar Lovert: 1. What is CVO -- https://community.klaviyo.com/show-tell-27/what-is-customer-value-optimization-cvo-6972 2. How to optimize CVO in your Klaviyo Account -- https://community.klaviyo.com/show-tell-27/how-to-optimize-customer-value-in-your-klaviyo-account-cvo-pt-2-7117 At Polaris Growth we understand growth using your owned media channels. That's why we only do Klaviyo, CRO and CVO! Knowing which lever to turn and when and executing on these are how we've helped a lot of ecommerce merchants find their path to growth. The Polaris – North Star – has been used for centuries to navigate the open seas. With a clear dot on the horizon, it ensures that your ship does not strand and that you continue sailing the right course. Every entrepreneur has that dot on the horizon. By keeping focus on your Polaris, we realize systematic growth for your business through Conversion Optimization and Marketing Automation.

Ackermann is the leading Danish e-mail marketing agency. With headquarters in Copenhagen, Denmark, Ackermann works with companies of all sizes both nationally and internationally. We work with a wide range of companies, from small startups looking to scale through targeted e-mail marketing, to large international corporations wanting to harness the power of e-mail and marketing automation. Ackermann’s laser-focus on e-mail marketing allows us to provide an outstanding variety of services that cover all areas of e-mail marketing: • Setting up automated e-mail flows • Setting up targeted e-mail campaigns • Crafting compelling copy • Crafting creative e-mail design • Increasing revenue by crafting conversion-driven content • High focus on optimization and split-testing of e-mail flows • Ongoing support and reporting

Get more value from your marketing efforts with a proven Klaviyo Elite Master partner. Northern is relied on for our expertise in delivering exceptional retail experiences and maximizing eCommerce performance. With a proven track record of empowering businesses to thrive in the competitive digital landscape, Northern Commerce stands at the forefront of innovation, specializing in Klaviyo integrations and collaborating seamlessly with various platforms such as Commerce Cloud, Adobe, Big Commerce, and Shopify.

PAASE is a UK-based, Klaviyo Master Elite agency founded in 2019 and headquartered in Milton Keynes/Buckinghamshire. From the outset, we’ve specialised in helping eCommerce and D2C brands harness zero‑ and first‑party data to craft smarter, more personalised email and SMS journeys. As pioneers, we were the first UK agency to achieve Klaviyo Platinum Master status, and the first Elite Master partner headquartered in EMEA. Our approach blends cutting‑edge AI with rigorous commercial focus. We design predictive segmentation and dynamic content workflows that adapt in real time—optimising send times, content, and customer experiences at every stage. Leveraging an Urgency‑Impact framework, we prioritise high‑ROI initiatives through iterative testing and AI‑driven automation, ensuring efficiency and relevance. We form long‑term partnerships rooted in transparency, data‑backed decisions, and shared success. Whether delivering rapid revenue uplifts—such as a 233 % increase in automated revenue and 238 % more daily orders for Okanui—or building sustainable frameworks, our portfolio spans global brands across beauty, fashion, homewares, wellness, and more. With PAASE, Klaviyo clients gain a partner who merges technology, strategy, and commercial insight to fuel scalable growth.

About Us Founded in 2014 and based in Sydney, Australia, we are a team of 35+ experts dedicated to helping leading and emerging retail brands scale and grow through performance marketing. By seamlessly blending technology, creativity, and data, we craft strategies that drive real impact. We specialize in accelerating growth for DTC retail brands, working shoulder-to-shoulder with our clients to achieve measurable outcomes. We believe that true success doesn’t happen in isolation—when executed with precision, the whole is always greater than the sum of its parts. Specialising in the key pillars that drive the greatest growth, our offering is carefully crafted to focus on best-in-class platforms, methodologies, and technologies. • Acquire: Acquire new customers online and offline through paid or programmatic media channels such as search, social and digital out of home • Retention: Maximise customer lifetime value with pre and post-purchase activities through email/SMS marketing, loyalty/referral programs. • Measure: Scientific insights and data solutions across performance media, customers, orders and products that help you scale successfully. CRM Klaviyo Growth Plans Our Klaviyo Growth Plans support clients with a range of strategies to increase customer lifetime value. Our deliverables include Klaviyo audits, flow/automation strategies, deliverability, segmentation strategies, template design and implementation, campaign management, reporting, analytics and omni-channel strategies and integrations. Platform and Data Migrations We handle complex migrations between marketing platforms, ensuring your customer data, segments and templates transition smoothly with minimal disruption to your marketing operations. Our methodical approach preserves data integrity while setting you up for future growth on Klaviyo. • Platform Assessment - Thorough evaluation of your current setup to identify all critical components for migration. • Customer Data Transfer - Secure movement of customer profiles with their complete deliverability status. • Segment Preservation - Careful recreation of your valuable customer segments and list structures or establishing a new structure for changing needs • Template Implementation - Thoughtful rebuilding of your email templates with opportunities for enhancement or building new templates to provide fresh direction. • Migration Verification - Comprehensive testing to ensure all systems function properly post-migration.

Flowium is a full-service Email Marketing Agency run by a team of proven experts. As a Klaviyo elite agency, our mission is to deliver results-driven email marketing for growth-focused eCommerce brands. We do it by providing you with an all-star team of pros to take care of everything related to email marketing, including: • Klaviyo account set up • Full email marketing strategy (abandoned cart, browser abandonment, welcome series, etc.) • Campaign content calendar • Email copy that fits your brand and connects with your customers • Email design optimized for mobile and dark mode • Technical set up and regular maintenance • Continuous testing and optimization for even better results We also offer SMS marketing to maximize engagement and repurchase rates with your brand. Every Flowium team member is an expert in their field, whether that’s copywriting, design, brand strategy, or the Klaviyo software, working together to bring you top-tier results. 🤝 Trusted by 500+ brands 💎 30%+ Average Email Marketing Revenue 🔥 $352M Email Revenue For real, revenue-boosting email marketing solutions, contact us. ⭐ Discover our top client success stories. Check them out here: https://flowium.com/new-case-studies/

DRINKS Amplify, powered by DRINKS, helps Shopify alcohol merchants scale and succeed with expert lifecycle marketing and eCommerce solutions. As the premier partner for alcohol brands and retailers, we combine deep industry expertise with advanced Shopify integrations to enable merchants to acquire, engage, and retain customers effectively. We drive customer retention with data-driven lifecycle marketing services, including email, SMS, and push notifications. Through personalized campaigns and AI-powered automation, we maximize engagement, repeat purchases, and lifetime value. Beyond lifecycle marketing, our team provides end-to-end web development and design services, creating visually stunning Shopify stores tailored to the unique needs of alcohol merchants. From custom themes to optimized checkout flows, we ensure online stores deliver exceptional user experiences that drive conversions while meeting complex alcohol sales regulations. Our custom Shopify themes are designed to be both impressive and compliant with industry-specific requirements. With DRINKS Amplify, alcohol merchants gain the tools, expertise, and support needed to thrive in the competitive eCommerce landscape, transforming their digital presence into a powerful growth engine.

&BAM is all about creating excitement in your email and SMS marketing campaigns, helping your business grow while building a loyal customer base. We’ve worked with bazillions of clients, making sure each and every one of them attracts loyal customers that feel warm and fuzzy about our clients’ brands. When you partner with &BAM, we can promise you the following: • Complete Email/SMS loyalty marketing strategy • Copywriting, design, and the technical mumbo jumbo • Quality, flow, and deliverability For the &BAM Team, it’s all about creating un-f*cking-believable relationships — both with our clients and between our clients and their customers! This is our mission, and it’s what propels us ever forward to do the best work possible for our clients. In order to fulfill this mission with each and every client, we tailor our Big Bam Process to each client’s particular needs. Learn more and schedule a call with us at --> andbam.co

Zettler Digital is your partner in performance marketing, retention, and website optimization Certified as Shopify Plus, Klaviyo Elite, Meta Business, and Google Partners, we optimize conversion funnels and user experiences to drive scalable growth for our clients. Over the past decade, we've partnered with 400+ brands, spanning luxury and fashion to food, health and wellness, sports, lifestyle, and even world-class athletes. No matter the industry or size, we’re dedicated to implementing ecommerce strategies tailored to your brand’s needs.

Arctic Leaf is a Baymard certified UX/UI design and implementation agency who takes the time to understand your brand voice and vision to deliver effective e-commerce experiences. Our suite of custom design and development services and integrations allow for bespoke web and mobile solutions that are thoughtfully created to meet the unique needs of every client. With robust expertise in UX/UI design, conversion rate optimization (CRO), software development, and growth marketing, our team has established Arctic Leaf as an innovative leader in the e-commerce and mobile development markets.

Lilo Social is a full-funnel e-commerce agency out of Brooklyn, New York specializing in Email + SMS, Paid Social + Search, Creative, and Landing Pages. We help e-commerce brands scale by bringing data-driven decisions and creativity together for a full-funnel marketing approach. Our approach allows us to work alongside your brand team as your growth partner, with a true in-house feel. We have a track record of helping to engineer high-performing strategies to scale your brand, profitably.

Hustler Marketing is an award-winning email marketing agency that helps extend the Lifetime Value of your customers with a complete, Done-For-You email and SMS marketing service. In 2023, we generated $100Mn+ for our clients in email revenue. Each of our eCommerce clients gets a 4-person team who takes full control of their email & SMS channels: • An experienced Account Manager who oversees strategy, reporting and briefing of creatives. • A designer and copywriter who craft engaging, on-brand emails that boost retention revenue. • A technical specialist to ensure optimal integration with your Email Service Provider. We pride ourselves on maintaining the best client-to-manager ratio in the business. Each of our Account Managers takes care of only 2-3 stores, ensuring that they always have the time to give each one the focus it deserves. Most of our clients start seeing growth in open rates, click rates, spam rate reduction, and a marked increase in email revenue within 2-3 months working with us.

Groove Commerce is a full-service agency that designs, builds and grows websites for leading eCommerce brands. Founded in 2007, the agency has helped hundreds of clients drive measurable impact and ROI. Groove Commerce uses 5 Core eCommerce Metrics to build strategic and impact-driven partnerships. The agency has accumulated more than 30 industry awards for its work with clients including Dippin’ Dots, The US Open Shop and Cutter & Buck. Additionally, Inc. Magazine, The US Agency Awards and Business Insider have recognized Groove Commerce for its growth and culture. A variety of design, development, and marketing case studies are available on the Groove Commerce website. Read how Groove Commerce has delivered impact-driven results for numerous clients by following the links below: Increasing Flow-Attributed Revenue by 46% With Klaviyo: https://www.groovecommerce.com/ecommerce-blog/elmhurst-klaviyo-flows Increasing One Athleisure Brand's Email Revenue 28%: https://www.groovecommerce.com/ecommerce-blog/klaviyo-case-study/ We Increased Email Revenue 126% With Our Signature Klaviyo Jumpstart https://www.groovecommerce.com/ecommerce-blog/klaviyo-jumpstart Groove Commerce is a Platinum Klaviyo Partner, Elite BigCommerce Partner and Shopify Partner agency. For more information, please visit https://www.groovecommerce.com or reach out using the “Contact” button on the left side of the page.