Email remains one of the most effective tools for driving sales, loyalty and brand engagement, especially when paired with Klaviyo’s advanced automation. But making the most of Klaviyo requires real expertise. This guide profiles the top Klaviyo email marketing agencies for 2025, so you can find a strategic partner to improve performance, increase ROI and scale your brand efficiently.
Top Klaviyo Email Marketing Agencies
1. InboxArmy
- Location: Grapevine, Texas, USA
- Founder: Scott Cohen (CEO)
- Year Founded: 2016
- Klaviyo Partnership: Master Silver Partner
InboxArmy stands out among the top Klaviyo email marketing agencies in the US, delivering measurable ROI for clients across diverse sectors. Their award-winning leadership supports major brands like Airbnb and eBay.
Best For: Large-scale automation and strategy across 25+ industries
LinkedIn: https://www.linkedin.com/company/inbox-army
2. Underground Ecom
- Location: London, UK
- Founder: James Matthewman (CEO)
- Year Founded: 2018
- Klaviyo Partnership: Elite Master Partner
Underground Ecom specializes in retention and advanced email automation for fast-growth DTC brands. Clients include Rose Skin Co and MedTerra.
Best For: Fast-growing DTC brands
LinkedIn: https://www.linkedin.com/company/underground-ecom/
3. DataSauce
- Location: Melbourne, Australia
- Founder: Will Spero (Founder/CEO)
- Year Founded: 2017
- Klaviyo Partnership: Platinum Partner
DataSauce is a Melbourne-based Platinum Partner specializing in data-driven email marketing, advanced automation and CRM optimization. They work with fast-growing DTC and FMCG brands including Emma Sleep, LSKD and daily&co.
Best For: High-growth ecommerce brands focused on performance and automation
LinkedIn: https://www.linkedin.com/company/datasauce
4. UN/COMMON
- Location: London, UK
- Founder: Not publicly disclosed
- Year Founded: 2015
- Klaviyo Partnership: Master Elite Partner
UN/COMMON focuses on multi-channel automation for subscription and e-commerce brands, working with clients like Deliveroo and Costa Coffee.
Best For: E-commerce, subscription brands
LinkedIn: https://www.linkedin.com/company/uncommonagencyco/
5. Andzen
- Location: Brisbane, Australia
- Founder: Brendan McCarthy (Founder/CEO)
- Year Founded: 2014
- Klaviyo Partnership: Master Elite Partner
Andzen is a leader in retention strategy and loyalty automation across APAC, serving brands such as LSKD and Oz Hair & Beauty.
Best For: Loyalty and retention programs
LinkedIn: https://www.linkedin.com/company/andzen/
6. DIDO Agency
- Location: Brooklyn, New York, USA
- Founder: David Latto (CEO)
- Year Founded: 2017
- Klaviyo Partnership: Master Platinum Partner
DIDO Agency excels in analytics and impactful onboarding for fashion and wellness brands like BeautifiedYou and LCI Paper.
Best For: Fashion, wellness, finance brands
LinkedIn: https://www.linkedin.com/company/didoagency/
7. Chronos Agency
- Location: Singapore
- Founder: Josh Chin (Founder/CEO)
- Year Founded: 2017
- Klaviyo Partnership: Master Elite Partner
Chronos Agency offers full-lifecycle email strategy and retention services, working with clients like The Oodie and Truly.
Best For: E-commerce growth, ROI optimization
LinkedIn: https://www.linkedin.com/company/chronosagency/
8. The Email Marketers
- Location: New York, USA
- Founder: Melanie (Founder/CEO)
- Year Founded: 2020
- Klaviyo Partnership: Official Partner
The Email Marketers deliver personalized campaigns for high-growth D2C brands, including Kick Game and Little Spoon.
Best For: High-growth D2C brands
LinkedIn: https://www.linkedin.com/company/the-email-marketers
9. Fuel Made
- Location: Bozeman, Montana, USA
- Founder: Drew Sanocki (Founder)
- Year Founded: 2013
- Klaviyo Partnership: Master Elite Partner
Fuel Made leads in Klaviyo-Shopify integration, powering brands such as Pura Vida Bracelets and Beardbrand.
Best For: Shopify/DTC e-commerce brands
LinkedIn: https://www.linkedin.com/company/fuel-made/
10. SmartBug Media
- Location: Newport Beach, California, USA
- Founder: Jen Spencer (CEO)
- Year Founded: 2008
- Klaviyo Partnership: Technology Partner
SmartBug Media specializes in advanced automation and digital funnel strategy for established brands like Caring.com and DOCOMO Pacific.
Best For: Established e-commerce, multi-channel brands
LinkedIn: https://www.linkedin.com/company/smartbugmedia/
How to Use the Klaviyo Agency Comparison Table
The table below offers a clear, side-by-side view of the top Klaviyo email marketing agencies for 2025. You can quickly compare services, client focus, standout features, notable clients and verified ratings. Each profile follows the same structure, making it easier to identify the best fit for your business goals.
This list was built through a detailed review of:
- Klaviyo expertise and real-world email results
- Verified client reviews (Clutch, G2, Google, LinkedIn)
- Industry coverage and notable brand partnerships
- Specialized Klaviyo services like automation and segmentation
- Team scale and executive credibility
Data was sourced from agency directories, verified profiles, review sites, and 2025 industry features. All ratings, leadership, and location info were cross-checked via LinkedIn and official websites.
| Agency Name | Best For | Rating | Key Features |
| InboxArmy | Large-scale, multi-industry brands | 4.9 | 25+ industries, ANA leadership, custom segmentation, CRM integration |
| Underground Ecom | Fast-growing DTC brands | 4.6 | 150+ global brands, advanced retention, global reach |
| DataSauce | E-commerce and subscription brands | 4.9 | Advanced flows and segmentation, ROI-focused strategy, Proven 28x ROI |
| UN/COMMON | E-commerce & subscription brands | 4.8 | Master Elite status, multi-channel, custom consulting |
| Andzen | Loyalty and retention (APAC) | 4.8 | Journey mapping, Master Elite, loyalty program focus |
| DIDO Agency | Fashion, wellness, B2B/B2C | 4.9 | Platinum Partner, deep onboarding, analytics |
| Chronos Agency | E-com scaling & retention | 4.8 | Elite data flows, ROI optimization, full lifecycle |
| The Email Marketers | US high-growth e-commerce | 4.9 | Full funnel, personalization, A/B testing |
| Fuel Made | Shopify/DTC e-commerce | 4.9 | Conversion-focused, Shopify-Klaviyo integration |
| SmartBug Media | Established, multi-channel brands | 4.9 | Tech partner, advanced integration, retention focus |
Key Takeaway
Choosing from the top Klaviyo email marketing agencies is a reliable way to drive growth, improve retention and maximize revenue from email. Each agency listed offers proven expertise, strong leadership and verified Klaviyo partnership, ensuring campaigns are results-focused and tailored to your goals. Regardless of your brand size or industry, partnering with a top Klaviyo email marketing agency gives you a clear advantage in today’s digital landscape.
FAQ: Top Klaviyo Email Marketing Agencies
1. What does a Klaviyo email marketing agency actually do for brands?
A top Klaviyo email marketing agency handles more than just basic setup. Agencies like InboxArmy support brands with advanced strategy, creative design, custom segmentation, sophisticated automation flows, analytics and ongoing optimization, all tailored to deliver measurable ROI and sustained growth.
2. How is working with a certified or “top” Klaviyo agency different from hiring a general email marketing agency?
Certified partners, such as those holding Master or Elite status, bring in-depth platform expertise, early access to Klaviyo features and a level of technical precision rarely found with generalist email agencies. Leaders in this space, regularly trusted by global brands, provide far greater impact thanks to their proven frameworks and insider knowledge.
3. How do I know if an agency is experienced with my industry or business model?
The best Klaviyo email marketing agencies, including InboxArmy, showcase success across multiple sectors, from e-commerce and retail to SaaS and hospitality. Reviewing agency client lists, like Airbnb, eBay and others, along with published case studies, helps ensure they understand your unique challenges.
4. What results and timelines should businesses expect when hiring a Klaviyo agency?
Most brands see improved open rates, higher conversions, and revenue growth within the first 1 to 3 months of a top-tier agency engagement. Agencies that serve major brands and have robust processes, like InboxArmy, are well-positioned to deliver rapid, measurable uplift.
5. What’s included in the agency’s process and how do they communicate and report with clients?
Expect a thorough onboarding process, a strategic roadmap, regular progress reporting and collaborative campaign management. Leading agencies provide proactive communication and transparent data analysis to keep clients informed and strategies on track.
6. Can the agency help with integrations beyond Klaviyo, such as Shopify, SMS or social?
Yes, agencies with advanced status, like those featured in your article, often have deep experience with Shopify, Magento, SMS marketing and more. This holistic approach ensures seamless customer journeys and multiplatform data connectivity.
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