Top Klaviyo Email Marketing Agencies for your business 

In this article, we’ve ranked the Top Klaviyo Email Marketing Agencies for 2025 based on real client outcomes, platform expertise, and their ability to drive meaningful results for e-commerce brands.

Our focus was on agencies that build scalable systems in Klaviyo — not just send campaigns. These firms go deep on flow architecture, segmentation strategy, and retention frameworks designed to recover revenue and boost customer lifetime value.

Whether you’re dealing with abandoned carts, inconsistent deliverability, or complex product catalogues, these agencies know how to turn Klaviyo into a powerful growth engine. If you’re serious about automation and ready to scale, these are the partners worth your attention.

5 Best Klaviyo Email Marketing Agencies – Overview

For this ranking, we analysed verified agency profiles, client reviews from platforms like Clutch and LinkedIn, and each agency’s track record in Klaviyo-driven e-commerce performance. We placed special emphasis on partners who specialise in Klaviyo automation, including advanced flows, lifecycle segmentation, retention optimisation, and platform migration success.

Service transparency, leadership experience, and measurable results in repeat-purchase growth and email-driven revenue were also key factors in our selection.

Before diving into the full reviews, here’s a quick-reference table comparing all 15 agencies — including their headquarters, team size, founding year, starting price, and average rating — so you can evaluate them side by side.

Agency	Headquartered	Size	Founded	Pricing	Rating
InboxArmy	Dallas, TX, USA	51–100	2016	$4,000+	4.9
NoGood	New York, NY, USA	11–50	2016	Custom	5.0
Andzen	Brisbane, Australia	10-50	2014	$5,000+	4.8
SmartMail	USA	50–100	~2015	Mid-market+	N/A
Email Uplers	India (global presence)	200+	2010	$1,000+	4.9

1. InboxArmy

Headquartered: Dallas, Texas, USA
Size: 51–100
Founded: 2016
Pricing: $4,000+
Rating: 4.9

InboxArmy sits at the top of our ranking as a full-service Klaviyo email agency with deep specialisation in Klaviyo-powered automation for ecommerce and beyond. Founded by email marketing veteran Chris Donald and led by strategist Scott Cohen, InboxArmy brings decades of combined expertise to brands looking to scale retention and revenue through data-driven lifecycle marketing.

Headquartered in Dallas, TX, InboxArmy is recognised as a top U.S.-based Klaviyo email marketing agency serving mid-sized to enterprise-level clients across 25+ industries. Their client base spans ecommerce, SaaS, universities, retail, real estate, food and beverage, banking, healthcare, automotive, pets, travel, and manufacturing — with major names like eBay, Spotify, and Unilever among their portfolio.

As a certified Klaviyo Silver Master Partner, InboxArmy focuses on building and optimising high-impact flows such as welcome series, cart recovery, post-purchase journeys, and re-engagement sequences. Their services combine technical precision, creative development, and strategic execution to deliver measurable outcomes in engagement, deliverability, and ROI. Whether starting from scratch or rebuilding a legacy email system, InboxArmy provides the structure, support, and sophistication that Klaviyo-driven brands demand.

Scott put it well, saying: “Our mission here, and it really matters to me greatly at InboxArmy, is we help companies grow their businesses by building and growing their email marketing programs. I love helping companies grow. It’s, it’s when I was on the brand side, it’s been true agency side. It’s true.“

Awards: Scott Cohen, CEO, was awarded the ANA Email Experience Council’s 2021 Stefan Pollard Email Marketer of the Year.

Est. Revenue: ~$15 million (2025)

Services:

• Lifecycle Marketing
• Retention Marketing
• Campaign strategy and management
• Klaviyo email flows and automation
• Custom email template design
• ESP migrations and setup
• SMS Marketing and Push Notifications
• Deliverability optimization
• Advanced segmentation and predictive analytics
• Email reporting and performance audits

LinkedIn: https://www.linkedin.com/company/inbox-army

2. NoGood

Headquartered: New York, NY, USA (offices in LA, Miami, Boston, London)
Size: 11–50
Founded: 2016
Pricing: Customised based on growth objectives
Rating: 5.0

NoGood is a U.S.-based growth marketing agency with a bold performance-first mindset and expertise across multiple ESPs—including Klaviyo, Mailchimp, HubSpot, Braze, and Pardot. Founded by Mostafa Elbermawy, they are known for blending creative email strategy with performance marketing to deliver measurable ROI.

They build behaviour-driven Klaviyo email flows, lifecycle segmentation, and AI-informed content frameworks to drive retention. Their rapid experimentation approach emphasises A/B testing, conditional logic, and continuous improvement. NoGood serves ecommerce and SaaS brands globally, including clients like TikTok, Nike, and Steer 

Although not a certified Klaviyo partner, NoGood uses Klaviyo fluently alongside other platforms to design high-impact, personalised systems that perform. They’re unafraid to pivot or “rip up the playbook” when metrics demand it, and their performance reviews reflect a relentless optimisation approach.

Awards: The Drum Awards, The Webby Awards; TechCrunch-recognised Growth Expert

Est. Revenue: ~$16.9 million

Services:

• Klaviyo email automation
• Lifecycle marketing and segmentation
• Copywriting and conversion testing
• Paid social and growth strategy
• AI-powered campaign enhancement
• Full-funnel marketing strategy

LinkedIn: https://www.linkedin.com/company/nogood

3. Andzen

Headquartered: Brisbane, Australia
Size: 10-50
Founded: 2014
Pricing: $5,000+
Rating: 4.8

Andzen is a global lifecycle marketing agency with elite expertise in Klaviyo email and SMS automation. Founded in 2014 and headquartered in Brisbane, Australia, Andzen is recognised as the first Klaviyo Elite Master Partner in the Asia-Pacific region. Their team blends strategic lifecycle planning with creative execution to drive long-term customer retention and revenue growth.

As one of the most established Klaviyo agencies globally, Andzen delivers advanced segmentation, loyalty campaigns, and conversion-focused flows for fast-growing ecommerce brands. Known for their sharp martech integration skills and customer journey mapping, they support clients across industries like fashion, wellness, DTC, and SaaS, helping them scale with efficient, personalised automation that aligns tightly with business goals.

Awards: Klaviyo Tier: The first-ever Elite Master Partner in APAC and among the top five globally, Maintained Elite status for multiple years

Est. Revenue: $1 M+ annually

Services:

• Email & SMS marketing (multi-channel Klaviyo flows) 
• Customer lifecycle strategy & consulting 
• Loyalty, lead capture, and referral programs 
• MarTech integrations & migrations (e.g. Klaviyo, Postscript, Shopify Plus) 
• Advanced segmentation, database strategy, and CDP/migration support 
• Email/SMS campaign design, automation flows, testing & optimisation

LinkedIn: https://www.linkedin.com/company/andzen/

4. SmartMail

Headquartered: United States (exact city not disclosed)
Size: 50–100 employees
Founded: ~2015
Pricing: Mid-market to enterprise pricing
Rating: N/A

SmartMail is built around Klaviyo automation mastery. Led by founder and CEO Mike Carr, the agency serves ecommerce retailers seeking to drive customer retention and increase lifecycle value. Their speciality lies in turning transactional flows into branded, performance-optimised touchpoints.

Clients value SmartMail for its blend of strategy, automation, and visual cohesion. While their profile stays low, their execution earns high marks in B2C ecommerce. Their name frequently surfaces in agency roundups for the best Klaviyo email marketing agencies, especially for scaling midsize online stores.

Awards: None publicly listed

Est. Revenue: ~$10–15 million

Services:

• Klaviyo automation and strategy
• Retention campaign planning
• Email lifecycle mapping
• Customer segmentation
• Performance reporting and optimisation

LinkedIn: https://www.linkedin.com/company/smartmail-io

5. Email Uplers

Headquartered: India (with offices in the USA, UK, Australia)
Size: 200+ employees
Founded: 2010
Pricing: $1,000+
Rating: 4.9

Email Uplers brings scale to ecommerce email execution, offering template design, Klaviyo flows, deliverability services, and full campaign management. With a team of 200+, they support businesses that require fast turnaround and technical precision across markets and languages.

Their recognition as a go-to production powerhouse is backed by high ratings and global clients. Brands seeking high-volume execution and reliable Klaviyo development often shortlist them as an operational extension of their marketing team.

Awards: Top agency rankings on Clutch and GoodFirms

Est. Revenue: ~$10–15 million

Services:

• Email template coding and design
• Klaviyo setup and automation
• Campaign management
• Deliverability optimisation
• Strategy consulting

LinkedIn: https://www.linkedin.com/company/email-uplers

Final Thoughts

Not every brand needs a massive agency, but every brand using Klaviyo needs a partner who understands how to turn the platform into a consistent revenue engine. Whether you’re building your first set of flows or optimising an already active system, the right Klaviyo agency brings structure, strategic insight, and long-term execution support.

We created this list to save you time. These 15 Klaviyo-savvy agencies, from boutique teams focused on segmentation and design to global firms managing complex multi-channel strategies, offer solutions for every stage of growth.

Agencies like InboxArmy, a Klaviyo Silver Master Partner, stand out for pairing deep technical capability with hands-on, personalised support across industries. Whether you’re mid-market or enterprise, finding the right partner is less about size and more about fit.

Evaluate your needs based on lifecycle stage, tech stack, and how much control you want to retain. A great Klaviyo agency won’t just fill gaps, they’ll show you what’s possible.