The 10 best Klaviyo agencies and partners for 2026
By Pete Devkota·Last reviewed ·Editorial · no paid placements
The best Klaviyo agencies for most ecommerce brands are Flowium (New York) if your program's fundamentals are broken, Underground Ecom (London) if you're an eight-figure DTC brand with a board-level retention budget, and Chronos Agency (Singapore) if you sell consumables that live on reorders. If you sell across Australia, the US and the UK, or want a senior operator inside the program, that's us: Email Optimize, an Adelaide-based Klaviyo partner, at #4.
Klaviyo's partner page lists 6,500+ agency partners (October 2026), and most "best Klaviyo agencies" lists are written by one of them ranking itself first. This one is written by an agency too. The difference: every tier below is quoted from Klaviyo's partner directory, every price is one the agency publishes, and every entry says where someone else is the better hire. If you'd rather start with us, here's our Klaviyo agency.
Our criteria: a partner directory listing you can check, named client work with revenue impact, ecommerce specialism rather than Klaviyo bolted onto a list of platforms, and a clear best-fit profile. Tier alone isn't enough: a Silver partner that knows your category can outperform an Elite Master partner that's spread thin. Reviewed quarterly. Last refreshed October 2026.
About the author. Aeronautical engineer turned ecommerce email specialist. Pete founded Email Optimize in 2017 and is behind $250M+ in attributed email and SMS revenue across 800+ brands. Full profile →
Listings are tiers as shown in Klaviyo's partner directory (connect.klaviyo.com) on 1 October 2026. Prices are only those the agency publishes on its own site; "Quote only" means it doesn't.
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.
The list
The 10 best Klaviyo email marketing agencies, ranked
Klaviyo Elite Master Partner (per Klaviyo partner directory, October 2026) · New York, NY
Flowium is a New York Klaviyo specialist, listed as Elite Master in Klaviyo's partner directory (October 2026). Founded in 2017 with email as the core, now running email, SMS, push, WhatsApp, RCS, Instagram DM automation and direct mail per their site, 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.
Email-first retention agency, with SMS, push, WhatsApp, RCS and direct mail per their site
Elite Master, one of 47 worldwide in Klaviyo's partner directory (October 2026)
Strong technical SOPs around deliverability and attribution
Klaviyo Elite Master Partner (per Klaviyo partner directory, October 2026); EMEA Agency Partner of the Year 2025
One of Klaviyo's three EMEA Agency Partners of the Year for 2025, and listed as Elite Master in Klaviyo's partner directory (October 2026). Its site reports "$165M in trackable sales" for clients (per their site, October 2026). The infrastructure and team depth are built for brands at scale; for brands below about $5M a year, the engagement model is usually more than you need. Strongest fit for brands where retention is already a board-level priority and there's an existing CRM lead managing the relationship.
One of Klaviyo's three EMEA Agency Partners of the Year, 2025
$165M in trackable sales for clients (per their site, October 2026)
Built for brands where retention is a board-level budget line
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 brands selling across Australia, the US and the UK, and brands wanting senior operator depth
Klaviyo Partner · Adelaide, Australia
We're an official Klaviyo partner (and an official Omnisend partner), founded in 2017 and headquartered in Adelaide, with West Coast-based team members for US brands. Two things make us a fit for specific brands. One program across markets: we run Klaviyo for brands selling in Australia, the US and the UK, with each market's consent rules and retail calendar built in. And operator depth: founder Pete Devkota served 22+ months as embedded Head of Retention Marketing at Relaxium, an INC 5000 supplement brand, where email and SMS added +$3M in incremental annual revenue. $250M+ in attributed email and SMS revenue across 800+ ecommerce brands. Proprietary DORTA diagnostic method.
$250M+ attributed email and SMS revenue across 800+ brands
Adelaide HQ, West Coast-based team members, UK brands served remotely
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: brands selling in more than one of AU, US and UK, or wanting senior operator depth
Best for brand-led retention (storytelling over discount-led)
Klaviyo Platinum Master Partner (per Klaviyo partner directory, October 2026) · Sale, Greater Manchester, 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. Clients shown on their site include Waterdrop, Carved, Duradry, Bliss and CoverFX (per their site, October 2026).
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 has sent over 4.3 billion emails and 147 million SMS messages for clients (per their site, October 2026), with the infrastructure and processes to match.
"The team behind two INC #1 fastest-growing companies" (per their site, October 2026)
Best for mid-market DTC wanting high-touch account management
Klaviyo Elite Master Partner (per Klaviyo partner directory, October 2026) · Jackson, WY (per their site)
Hustler runs a deliberately small client-to-account-manager ratio (per their site, account managers handle a maximum of three stores), 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.
Account managers capped at three stores (per their site)
Best for Shopify Plus brands wanting integrated dev + email
Klaviyo Elite Master Partner (per Klaviyo partner directory, October 2026) + Shopify Plus Partner · Colbert, WA (per their site)
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 Elite Master Partner (per Klaviyo partner directory, October 2026) · Brisbane / Sydney, Australia
Andzen was the first Klaviyo Elite Master partner in APAC (per their site), is still listed at Elite Master in Klaviyo's partner directory (October 2026), and was named Klaviyo's APAC Partner of the Year in 2025 and again in 2026 (K:Partners Awards, announced by Klaviyo on 9 September 2026). Brisbane and Sydney offices. Strong fit for Australian brands at scale where Elite Master credentialing matters to internal stakeholders and the engagement is primarily AU-domestic.
Elite Master in Klaviyo's partner directory, first in APAC (per their site)
Klaviyo APAC Partner of the Year, 2025 and 2026
Brisbane + Sydney offices
Strongest fit for AU-domestic brand programs at scale
Best for brands wanting AI-augmented lifecycle automation
Certified Klaviyo partner (per their site)
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 (Elite Master, AU-domestic) or Email Optimize (if you also sell in the US or UK).
US or UK ecommerce expanding into Australia and New Zealand
→ Email Optimize. One team runs the program across all three 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.
Partner tiers
Klaviyo partner tiers and the partner directory, explained
Klaviyo runs a partner program for the agencies, freelancers and consultants who set up and run Klaviyo for brands, and a separate program for technology partners that build integrations. Its become-a-partner page lists 6,500+ agency partners and 350+ integration partners as of October 2026. Agency partners are listed in the Klaviyo partner directory, which is where most brands start looking.
Each directory badge has two parts, a track and a tier. The Advisor track is for partners that refer brands to Klaviyo but don't run their accounts. The Master track is for partners that run Klaviyo for clients. Tiers go Bronze, Silver, Gold, Platinum and Elite. Per Klaviyo Academy's partner program course (checked October 2026), each step up takes more monthly revenue from referred and managed accounts and more certified staff: Silver on the Master track needs $250 a month from each and one certified employee, while Elite needs $40,000 a month from each, 20+ certified employees and more than one case study a year. When we checked on 1 October 2026, the directory listed 47 Elite Master partners worldwide.
So tier tells you an agency is large on the platform and has trained people. It doesn't tell you whether they're good in your category, or who will actually run your account. A smaller partner that specialises in what you sell can outperform an Elite partner that treats Klaviyo as one service among many. Use tier as a filter, not a verdict.
To check a claim, search the agency's name at connect.klaviyo.com. Anyone can put a Klaviyo logo on a website; the directory is the record Klaviyo keeps. Where an agency's own badge and its directory profile disagree, go by the directory. Every tier on this page is quoted from it.
How do you become a Klaviyo partner?
Agencies, freelancers and systems integrators apply through the partner program at klaviyo.com/partners. Accepted partners get partner tools, training and certifications, and a directory listing, and move up tiers as their referred and managed revenue grows and more of the team certifies.
If you run a brand, you don't need to become a partner to use Klaviyo. The program is for the people who build and run accounts for others. What you need is a partner who knows your category, which is what the checks on this page are for. We're an official Klaviyo partner, and an official Omnisend partner for brands where Omnisend fits better.
Most Klaviyo agencies don't publish prices. Here's what was public in October 2026, checked on each agency's own site:
InboxArmy: managed services from $1,500 a month.
Darkroom: retention marketing from $5,000 a month.
Duh Retention (Postscript partner, Shopify brands): one-time projects from $2,500, retainers $5,000 to $12,000 a month.
Climb & Conquer (UK): Klaviyo management from £400+ a month for campaigns only, up to £2,400+ for bespoke programs.
Get Better (UK): one-off Klaviyo audits at £199, £399 and £800 plus VAT.
Email Optimize (us): a free audit, projects (setup, migration, flow rebuild, deliverability fix) at $3,000 to $15,000 USD, and retainers typically $3,000 to $12,000 USD a month, month-to-month with 30 days' notice.
Freelancers: Upwork puts a freelance Klaviyo expert at $40 to $90 an hour.
What moves the number
Campaigns a month, flows to build or rebuild, list size, whether SMS is in scope, and whether you're buying strategy or just production. Klaviyo's own bill comes on top: it charges on active profiles, $20 a month at 500 profiles and $150 at 10,000 for email as of October 2026, with SMS extra. Judge any fee against the incremental email and SMS revenue it produces, not against another agency's quote.
Freelancer: right for one-off jobs (an audit, a welcome flow, a migration) and for stores under roughly $500K a year, where a retainer is hard to justify. Upwork puts freelance Klaviyo experts at $40 to $90 an hour as of October 2026. You're vetting one person, so quality varies widely; our Klaviyo experts list covers where to hire and how to check.
Agency: right when the work is ongoing and covers strategy, copy, design, build, deliverability and reporting every month. That usually starts to pay at $500K to $1M a year in revenue. A team also beats one person on continuity: holidays, sick days and Black Friday don't stop the program.
In-house: right when email is a strategic channel at $10M+ and you can hire senior. Plenty of brands at that size keep an agency alongside the hire for production and a second opinion. The worst version of all three is the one nobody measures.
Before you sign
Questions to ask before you sign
Ask for things you can check. A good Klaviyo agency answers all of these on the first call without going vague.
What's your listing in Klaviyo's partner directory? Then look it up at connect.klaviyo.com.
Show me revenue per recipient, before and after, for a client like me. Not open rates: Apple Mail Privacy Protection inflates them.
Who works on my account, and how many other accounts do they carry?
What happens in the first 30 days? Good agencies audit deliverability, flows, segmentation and attribution before they redesign anything.
Whose name is the Klaviyo account in? It should be yours, with the agency added as a user, so flows, templates and data stay with you if you part ways.
How do you staff Black Friday and Cyber Monday?
What's the contract and notice period? Month-to-month after an initial term is common. A long lock-in with no performance review is a yellow flag.
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: an active partner with referred and managed revenue on the platform and certified staff. Klaviyo's tiers run Bronze, Silver, Gold, Platinum and Elite, on an Advisor track (partners who refer brands) or a Master track (partners who run accounts), and Elite Master is the top of the directory. But a Silver partner with deep specialism in your category will often outperform an Elite Master partner that is spread across many platforms or verticals. Use tier as a baseline filter, not a final selection criterion.
Agencies, freelancers and systems integrators apply through Klaviyo's partner program at klaviyo.com/partners. Accepted partners get partner tools, training, certifications and a listing in the partner directory, and move up tiers as their referred and managed revenue grows and more of the team gets certified. Brands don't need to become partners to use Klaviyo.
Few publish prices. As of October 2026: InboxArmy managed services from $1,500 a month, Darkroom retention from $5,000 a month, and Duh Retention retainers of $5,000 to $12,000 a month with projects from $2,500. Email Optimize: free audit, projects $3,000 to $15,000 USD, retainers typically $3,000 to $12,000 USD a month, month-to-month. Freelancers on Upwork typically charge $40 to $90 an hour. Klaviyo's own subscription is billed on top.
Freelancers fit one-off projects, audits, and brands under roughly $500K a year 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, build and deliverability) and needs team continuity. Above $10M revenue, an in-house hire becomes a serious option, often with an agency alongside.
Search the agency name in Klaviyo's official partner directory at connect.klaviyo.com. The directory shows the current tier. Agencies marketing themselves at a tier they don't hold can be fact-checked there in 30 seconds. We hold a current Klaviyo partner listing.
Cost scales with active profiles, including people who bought without subscribing, so the bill grows with your customer file. SMS is billed per message on top of email. It is built for B2C ecommerce, so sales-led B2B teams need a separate CRM. Reporting uses attribution windows that can overstate email's share if left on defaults. And some categories are restricted: prescription products are prohibited on every channel, and CBD and cannabis are prohibited on SMS in the US and Canada.
It depends on the job. For small ecommerce stores it is Mailchimp and Omnisend. For SMS it is Attentive and Postscript. At enterprise scale it is Braze, Iterable and Salesforce Marketing Cloud. For B2B and sales-led teams it is HubSpot and ActiveCampaign. For Shopify-native ecommerce email and SMS at growth stage, Omnisend is the closest like-for-like alternative.
Yes. Klaviyo is a publicly traded company (NYSE: KVYO) headquartered in Boston, founded in 2012, and reported more than 205,000 customers as of 30 June 2026. It is one of the most widely used email and SMS platforms for ecommerce, with native integrations for Shopify, WooCommerce, BigCommerce and Magento.
Klaviyo is a public company listed on the New York Stock Exchange under the ticker KVYO since its September 2023 IPO, so it is owned by its shareholders. It was founded in 2012 by Andrew Bialecki and Ed Hallen and is headquartered in Boston.
Because it bills on active profiles, everyone you can email, not on the emails you send. Since February 2025 your plan must cover that full count, so an unpruned list pushes you up tiers. As of October 2026 the email plan is $20 a month at 500 profiles and $150 at 10,000, with SMS on top. Suppressing profiles that never engage is the fastest way to bring the bill down.
Because doing this honestly is more useful than the alternative. We tell you exactly where Email Optimize is the right answer (brands selling across Australia, the US and the UK, 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.