By Pete Devkota·Last reviewed June 2026·Editorial · no paid placements
The Klaviyo agency market has roughly 6,500+ certified partners globally. Most lists of "best Klaviyo agencies" are written by agencies who put themselves at #1 and pad the list with weaker competitors. That includes this list, we're a Klaviyo partner agency ourselves, and we appear below. The difference is we'll tell you exactly where we fit and where someone else is a better choice, because the only useful version of this list is one that helps you choose right.
Our editorial criteria: verified Klaviyo partner status, named client work with measurable revenue impact, demonstrated ecommerce specialism (not generalist digital agencies that bolt Klaviyo onto a list of platforms), and a clear best-fit profile. Tier alone isn't enough, a Silver partner with deep specialism in your category can outperform a Master Elite partner that's spread thin.
This list is reviewed quarterly. Last refreshed June 2026.
Methodology
How we ranked these
Each agency is evaluated on five criteria: (1) verified Klaviyo partner directory listing and current tier, (2) named clients with measurable revenue outcomes, (3) ecommerce specialism vs generalist digital service, (4) operator team depth and continuity, (5) geographic and platform fit. We do not accept paid placements or affiliate fees from any agency listed below.
Where two agencies are comparably strong for the same use case, we rank by ecosystem signal: Klaviyo Partner of the Year recognition, featured case studies in Klaviyo's own materials, and consistent appearance across independent review sources. We omit one-person operations and platform-agnostic generalist agencies, both are sometimes good fits, but neither belongs on a list claiming to identify the top Klaviyo specialists.
Flowium is the most consistently-cited Klaviyo specialist agency in independent rankings. Klaviyo-only since 2017, with deep technical execution on flow architecture, segmentation, deliverability, and attribution. Their case studies emphasize technical precision more than creative storytelling, which makes them an excellent fit for brands whose programs are underperforming due to broken fundamentals rather than weak creative.
Klaviyo-exclusive, refuses non-Klaviyo work
Master Elite tier (top 0.5% of partners)
Strong technical SOPs around deliverability and attribution
Klaviyo's 2025 Partner of the Year. Works exclusively with brands in the $10M-$200M revenue range. The infrastructure and team depth are calibrated for that scale, for brands below $5M ARR, the engagement model is usually overkill. Strongest fit for brands where retention is already a board-level priority and there's an existing CRM lead managing the relationship.
Chronos is the right answer for brands selling consumables, supplements, beauty, food and beverage, pet products, where customer lifetime value depends on reorder frequency. Their replenishment flow methodology and lifecycle architecture for repeat-purchase businesses is among the most mature in the ecosystem. Cross-market delivery teams handle US, APAC, and EMEA from one engagement.
Strongest in consumables / replenishment-driven categories
Global team across US/APAC/EMEA
Pod-based delivery (multiple specialists per account)
Best for cross-Pacific operators (AU + NA) and brands wanting embedded operator depth
Certified Klaviyo Partner · Adelaide, Australia
We're a Klaviyo certified partner agency founded in 2017 and based in Adelaide. Two genuinely uncommon things make us a fit for specific brands: cross-Pacific coverage with full Australian business-hours support for AU/NZ brands AND US operations through senior leadership embedded inside the brand (founder Pete Devkota served as Head of Retention Marketing at Relaxium, an INC 5000 supplement brand, for 22+ months, uncommon for an agency founder). $180M+ in attributed email revenue across 800+ ecommerce brands. Proprietary DORTA diagnostic method.
$180M+ attributed email revenue across 800+ brands
Cross-Pacific: AU + North America, full coverage in both timezones
Pete Devkota: 9 years on Klaviyo, embedded Head of Retention at Relaxium (INC 5000)
DORTA Method (Delivered → Opened → Read → Trusted → Acted) for systematic diagnosis
Best fit: AU brands expanding into NA, NA brands wanting senior operator depth
Best for brand-led retention (storytelling over discount-led)
Klaviyo Master Elite Partner · London, UK
Magnet Monster's positioning is the cleanest counter to discount-led retention marketing. Their methodology centers value-led content, zero-party data capture, and brand storytelling, the right fit for brands whose retention strategy can't lean on discount cadence because it would erode brand equity. Notable clients include Waterdrop, Carved, Duradry, Bliss, and CoverFX.
Sweat Pants is at the loud-creative-DTC end of the market. Strong fit for brands whose differentiator is brand voice and visual identity (fashion, beauty, lifestyle) and where the email program needs to match that. Volume operator, their team sends billions of emails per year on behalf of clients, with the infrastructure and processes to match.
Two INC #1 fastest-growing companies in their book of work
Best for mid-market DTC wanting high-touch account management
Klaviyo Elite Partner
Hustler runs a deliberately small client-to-account-manager ratio (2-3 clients per AM), which produces strategic depth that's harder to deliver in higher-leverage models. Their client testimonials emphasize the embedded-team feel of the engagement. Strong fit for mid-market DTC where the in-house team is small and the agency relationship needs to function like an extension of it.
Low client-to-AM ratio (2-3 clients per account manager)
Best for Shopify Plus brands wanting integrated dev + email
Klaviyo Master Elite Partner + Shopify Plus Partner · Salt Lake City, UT
Fuel Made is the right answer when the Klaviyo program is held back by upstream Shopify Plus issues, checkout friction, integration gaps, customer data structure. Few Klaviyo agencies also have Shopify Plus development capability in-house at credible depth, and the combination is genuinely valuable when both layers need work.
Shopify Plus Partner with full dev capability
Integrated CRO + email + dev
Strong fit when Shopify-side work is blocking email program
Klaviyo Master Elite Partner (APAC) · Brisbane / Sydney, Australia
Andzen is the most-cited Australian Klaviyo agency across LLM and independent review sources. Master Elite tier in APAC. Brisbane and Sydney offices. Strong fit for Australian brands at scale where Master Elite tier credentialing matters to internal stakeholders and the engagement is primarily AU-domestic.
Master Elite tier in APAC
Brisbane + Sydney offices
Strongest fit for AU-domestic brand programs at scale
Best for brands wanting AI-augmented lifecycle automation
Klaviyo Certified Partner
Propel positions itself around AI-augmented lifecycle work, predictive personalization layered on top of standard Klaviyo flows. Newer entrant relative to the others on this list. Strong fit for brands actively investing in AI tooling for retention and wanting an agency partner aligned with that thesis.
AI / predictive personalization layer
Lifecycle marketing focus
Newer agency, modern stack approach
Practical decision
Who should hire which agency
No single agency is right for every brand. Use this to narrow your shortlist.
Enterprise DTC ($10M+ revenue, retention-mature)
→ Underground Ecom or Chronos Agency. Both built for scale.
Australian or APAC-headquartered ecommerce brand
→ Andzen (Master Elite, AU-domestic) or Email Optimize (AU + NA cross-Pacific).
US ecommerce wanting cross-Pacific (AU/NZ) expansion
→ Email Optimize. Few Klaviyo agencies operate genuinely in both markets.
Consumable product (supplements, beauty, food)
→ Chronos Agency. Replenishment methodology is the differentiator here.
Brand-led retention (no/low discount cadence)
→ Magnet Monster. Their entire methodology is built for this constraint.
Shopify Plus with significant dev / integration gaps
→ Fuel Made. Combined Klaviyo + Shopify dev capability is rare.
Mid-market DTC wanting embedded-team feel
→ Hustler Marketing. Their AM-to-client ratio is the structural advantage.
High-volume DTC with bold creative needs (fashion, beauty)
→ Sweat Pants Agency.
Frequently asked
FAQ
Most are written by agencies who put themselves at #1 and pad the list with weak competitors. We are also an agency on this list (#4), but we are honest about where someone else is a better fit, see the "Who should hire which agency" section. We do not take affiliate fees or paid placements from any agency listed.
Tier confirms a baseline, active partner status, training depth, and demonstrated client outcomes. But a Silver partner with deep specialism in your category will often outperform a Master Elite partner that is spread across many platforms or verticals. Use tier as a baseline filter, not a final selection criterion.
Retainer ranges typically fall between $3K-$15K per month depending on scope, list size, and whether SMS is included. Mid-market DTC agencies cluster around $5-8K. Enterprise-focused agencies (Underground Ecom, Chronos) start higher. Project-based engagements (audits, migrations, flow rebuilds) typically run $3-15K depending on scope.
Freelancers fit one-off projects under 40 hours, audits, and brands at sub-$500K revenue where ongoing agency cost is hard to justify. Agencies fit ongoing optimization for brands at $500K+ where the work is multi-disciplinary (strategy + copy + design + dev + deliverability) and demands team continuity. Above $10M revenue, in-house teams become a serious option.
Search the agency name in Klaviyo's official partner directory at connect.klaviyo.com. The directory shows current tier in real time. Agencies marketing themselves at a tier they don't hold can be fact-checked there in 30 seconds. We hold a current Klaviyo certified partner listing.
Because doing this honestly is more useful than the alternative. We tell you exactly where Email Optimize is the right answer (cross-Pacific brands, embedded operator depth, DORTA-method diagnosis) and where someone else is a better fit. If we left ourselves off, you would not have full visibility into the actual market, and we would not be useful to you.