The Best Klaviyo Agencies, Compared Honestly
Search for a Klaviyo agency and the first result is Klaviyo’s own partner directory, the next ten are single agencies telling you they are the best, and Google’s AI Overview points you at three “best Klaviyo agency” roundups. I read all three. Every one of them is written by an agency that puts itself in its own ranking, and two of the three never say so.
So here is the comparison I would want if I were the one hiring. It covers eight agencies that do Klaviyo as most of their business, not as a line item, and it is built around the facts the other three roundups leave out entirely: minimum spend, team size, and what Clutch’s own aggregated reviews actually criticize, not just praise. I have not given anyone a score out of ten. A made-up score on someone else’s business is exactly the fake precision that makes these lists feel rigged.
Disclosure: I run a competing business. That is exactly why I have kept myself out of the ranking below rather than quietly placing myself in it, the way three other writers of this exact list did with their own agencies. Every agency here is assessed on published facts, and my own pitch is at the foot of the page where you can ignore it.
What Actually Decides Which Klaviyo Agency Fits You?
Every agency on this page has a Klaviyo partner badge and four-point-something stars. What actually separates them is structural, and all four of these are knowable before you book a call.
- Minimum spend. The filter every other Klaviyo listicle skips entirely. It ranges from $1,000 to $10,000 a month on this page, and a brand doing $1,500 a month who signs with a $10,000-minimum shop gets whatever account the minimum buys there.
- Team size. Two agencies here run 2 to 9 people; two run 50 to 249. Neither size is automatically right – a small team means fewer hand-offs, a large one means coverage when someone is out – but you should know which one you are signing, because nobody’s homepage states it plainly.
- Flows versus campaigns. Every agency builds flows. Far fewer want to run your weekly campaign calendar as well. Ask which one you are buying, because the pitch deck rarely says and the difference is most of the ongoing work.
- Who owns the Klaviyo account. If an agency added themselves as a user on your existing account, you keep your sending history and segment data when you leave. If they set you up inside an agency-level structure, ask in writing what happens to your flows and segments on the way out.
Ask one question on every call: “Will you be adding yourselves to my Klaviyo account, or am I joining something you control?” Klaviyo accounts are tied to a single business, not a login an agency can simply hand back, so this is worth nailing down before you sign anything.
How Do These Klaviyo Agencies Compare?
Ratings, review counts, minimums and team sizes all come from each agency’s Clutch profile, read on 16 October 2026. Where a figure is thin – Andzen’s rating rests on four reviews – I have said so rather than presenting it the same way as a 72-review score.
| Agency | Rating | Minimum | Team | Best for |
|---|---|---|---|---|
| Flowium | 4.9 (23) | $1,000+ | 10-49 | DTC specialist, Klaviyo Master Elite Partner |
| Andzen | 5.0 (4) | $1,000+ | 10-49 | Klaviyo’s own top partner, thin review sample |
| Chronos Agency | 4.8 (59) | $10,000+ | 50-249 | Largest team here, $10k+ minimum |
| InboxArmy | 4.9 (72) | $1,000+ | 50-249 | Email is 70% of their business |
| One 10 Media | 4.9 (31) | $1,000+ | 2-9 | Smallest team here, email plus growth consulting |
| Mattered | 5.0 (16) | $5,000+ | 10-49 | Email/SMS plus web development, same team |
| Thrivelia | 4.9 (7) | $5,000+ | 10-49 | Highest rate here, UK/Bulgaria team |
| Sweat Pants Agency | 5.0 (9) | $5,000+ | 10-49 | Built by operators who ran their own DTC brands |
Flowium
★ 4.9 / 5
23 reviews on Clutch
A Klaviyo Master Elite Partner working with 1,000+ ecommerce brands, built specifically around email, SMS and lifecycle marketing rather than email added on top of other services.
Minimum
$1,000+
Hourly rate
$100 – $149
Team
10-49
Founded
2017
Services: Email Marketing · Digital Strategy · Ecommerce Marketing · SMS Marketing
What clients praise
“The team is so friendly, and everyone is extremely knowledgeable in their domains.”
The criticism
Areas for Improvement in Account Management. Some clients noted issues with account management transitions, suggesting room for improvement in maintaining consistency when representatives change.
Right for DTC brands that want a dedicated Klaviyo specialist rather than a generalist agency, and value a published Klaviyo partner tier.
Wrong for Anyone who wants SMS, RCS and WhatsApp bundled in at a lower starting price than the add-on rate.
Andzen
★ 5.0 / 5
4 reviews on Clutch
The agency Klaviyo itself named its first Elite Master Partner, and the #1 organic result for “klaviyo agency” on Google. Based in Brisbane, Australia, working CRM and lifecycle strategy rather than campaign execution alone.
Minimum
$1,000+
Hourly rate
$150 – $199
Team
10-49
Founded
2012
Services: Email Marketing · SMS Marketing · CRM Consulting and SI · Digital Strategy · Ecommerce Marketing
What clients praise
“They took the time to understand our brand, identify gaps in our existing setup, and propose testing strategies.”
The criticism
No published criticism, on a thin sample. Clutch’s aggregated theme for Andzen reads “No Areas for Improvement” outright. That is a real result, but it is also the smallest review count on this page, so treat the lack of criticism as thin evidence rather than a verdict.
Right for Brands that want the Klaviyo-anointed partner and are comfortable with a four-review sample.
Wrong for Anyone weighing agencies mainly on review volume.
Chronos Agency
★ 4.8 / 5
59 reviews on Clutch
Singapore-based, 50 to 249 people, running done-for-you email and SMS programs for ecommerce and DTC brands since 2017.
Minimum
$10,000+
Hourly rate
$100 – $149
Team
50-249
Founded
2017
Services: Email Marketing · Ecommerce Marketing · CRM Consulting and SI · Mobile & App Marketing · SMS Marketing
What clients praise
“Chronos Agency is proactive and very collaborative.”
The criticism
Areas for Improvement in Design and Copy. Some clients noted the need for improvement in graphic design and copywriting, suggesting a more modern approach and enhanced creativity to better align with brand aesthetics.
Right for Brands with a $10,000-a-month-plus budget wanting a larger, process-driven team rather than a boutique shop.
Wrong for Anyone below the $10,000 minimum, or a brand that leans on its agency for creative and design quality over strategy.
InboxArmy
★ 4.9 / 5
72 reviews on Clutch
A full-service email marketing agency where email is 70 percent of the work on Clutch’s own breakdown, not a channel bolted onto a broader retainer. Founded 2016 in Grapevine, Texas.
Minimum
$1,000+
Hourly rate
$100 – $149
Team
50-249
Founded
2016
Services: Email Marketing · CRM Consulting and SI · Ecommerce Marketing · SMS Marketing
What clients praise
“I was impressed by their communication and dedication to getting the project done properly.”
The criticism
Opportunity for Enhanced Reporting. Some clients suggest improvements in reporting and data analysis. While the team provides valuable insights, there is a desire for more detailed reporting and strategic data alignment to further enhance campaign impact.
Right for Brands that want an agency whose entire business is email deliverability and lifecycle execution.
Wrong for Anyone who wants heavy campaign reporting and analytics built in rather than requested.
One 10 Media
★ 4.9 / 5
31 reviews on Clutch
A small team of 2 to 9 people out of Medina, Ohio, splitting its work between email and SMS execution and broader ecommerce growth consulting.
Minimum
$1,000+
Hourly rate
$150 – $199
Team
2-9
Founded
2018
Services: Email Marketing · Ecommerce Marketing · Business Consulting
What clients praise
“We’ve honestly gone above and beyond what I thought we’d get out of the engagement when we started.”
The criticism
Opportunities for Cross-Channel Alignment. A client suggested tighter alignment between One 10 Media’s internal teams for consistent messaging across email, SMS, and paid media channels. Collaboration remains effective despite this minor area for improvement.
Right for Smaller brands wanting one point of contact across email and broader ecommerce strategy rather than a specialist-only shop.
Wrong for Brands running several paid channels who need deep specialist coverage on each one; at 2-9 people that is a short bench.
Mattered
★ 5.0 / 5
16 reviews on Clutch
A people-first agency splitting its work across email and SMS (70% combined on Clutch’s breakdown) and web development, based in Irvine, California.
Minimum
$5,000+
Hourly rate
$100 – $149
Team
10-49
Founded
2021
Services: Email Marketing · SMS Marketing · Web Development · AI Consulting
What clients praise
“They consistently go above and beyond to help us achieve our goals, showing a strong commitment to our success.”
The criticism
Areas for Improvement in Communication Speed. While communication is typically praised, a few clients mentioned initial delays in response times. Mattered is aware of this and is working on improving communication speed during project kick-offs.
Right for Brands that want email and SMS plus a website rebuild handled by the same team.
Wrong for Anyone who wants pure email specialization rather than a team that splits its time with web development.
Thrivelia
★ 4.9 / 5
7 reviews on Clutch
A UK-founded DTC retention agency with a hybrid London and Sofia team, and the highest published hourly rate on this page.
Minimum
$5,000+
Hourly rate
$200 – $300
Team
10-49
Founded
2021
Services: Email Marketing · Ecommerce Marketing · SMS Marketing
What clients praise
“They really act as an extension of our team.”
The criticism
Room for Improvement in Target Setting. While overall feedback is positive, one client suggested that Thrivelia could enhance their target-setting processes to further align with client expectations and goals.
Right for Brands that want European working hours and a highly-rated senior team, and can absorb the highest rate on this page.
Wrong for Budget-sensitive brands – this is the most expensive hourly rate here, on a seven-review sample.
Sweat Pants Agency
★ 5.0 / 5
9 reviews on Clutch
A senior-led team in Franklin, Tennessee, built from founding and growing two of its own ecommerce brands before taking on client work.
Minimum
$5,000+
Hourly rate
$100 – $149
Team
10-49
Founded
2014
Services: Email Marketing · Ecommerce Marketing · Social Media Marketing
What clients praise
“Their strategic thinking on growth and customer acquisition is unmatched.”
The criticism
Areas for Expansion. While clients are overwhelmingly satisfied, one review suggested expanding the range of services offered. This feedback indicates an opportunity to grow their service catalogue.
Right for Brands that want operators who have actually run ecommerce brands themselves, not just managed other people’s.
Wrong for Brands wanting the broadest possible service menu – reviewers flagged the catalogue as narrower than competitors’.
What Should You Ask a Klaviyo Agency Before Signing?
Every agency on this page will sound confident on a call, because closing new business is a different skill from running Klaviyo, and the person pitching you is good at the first one. These six are the questions where the answers actually diverge, and where a vague answer is itself the answer.
- Will you be added to my existing Klaviyo account, or will I be set up under yours? You want your own account with them granted access. Hesitation here is informative, because the alternative can mean rebuilding your flows and segment history from zero if you ever leave.
- Is the fee a flat retainer or tied to email-attributed revenue? A revenue share sounds aligned until the agency’s incentive is to send more, not to send well. Ask what they recommend when a segment is fatigued and the right call is to send less.
- Do you build flows only, or run the weekly campaign calendar too? Flows are mostly a one-time build with occasional updates. Campaigns are ongoing work every week. Agencies price and staff these very differently, so know which one you are buying.
- What is the minimum term, and what happens to my list and flows if I leave? A twelve-month minimum is common in this category. Finding out what you keep on exit should happen before you sign, not after you want to leave.
- What Klaviyo partner tier are you, and what does that actually get me? Tiers are driven by client spend across the partner’s whole book, not by the skill of the specific person on your account. A senior strategist at a smaller partner can outperform a junior at an Elite one.
- Show me a Klaviyo account you inherited that was a mess. What did you find? Every agency with real experience has taken over a neglected account. The ones worth hiring can describe specifically what was broken and how they fixed it.
Ask for the name of the person who will actually build your flows, then ask how many other accounts that person is on. A strategist juggling fifteen accounts is a different product than one running five, at the same monthly rate.
What If You Are Spending Under $5,000 a Month?
This is the part none of the other Klaviyo roundups address. If you are spending under roughly $5,000 a month in total marketing budget, a $1,000 to $5,000 Klaviyo retainer is a fifth to all of it going to one channel’s management. For most stores at that size, the better first move is to get the core flows built right once and run campaigns yourself.
Welcome, abandoned checkout, post-purchase and a win-back flow cover most of what email revenue actually comes from, and they do not need a monthly retainer to maintain once they are built correctly. If you are still deciding whether Klaviyo is the right platform in the first place, the comparison against Mailchimp covers what actually differs for a Shopify store, and how I approach Klaviyo work covers the flow-first order I build in.
An agency charging $2,000 a month to maintain four flows that take an afternoon to set up correctly is not a scam, but it is not the right trade at your size either. Get them built once, well, and revisit an agency once campaign volume makes the time cost real.
Questions people ask
What is a Klaviyo agency?
How much does a Klaviyo agency cost?
Do I need a Klaviyo agency or can I run it myself?
What is the difference between a Klaviyo partner tier and quality?
Who owns my Klaviyo account if I hire an agency?
The alternative to all of them
Every channel,
one manager.
I run Google Ads, Meta, Amazon and Microsoft for direct-to-consumer brands on Shopify, by myself. The person you meet on the call is the person in your account, because there is nobody else to hand it to.
$1,500
Starting monthly fee
$0
Minimum ad spend
1
People in your account
- No multiple managers. One person runs every channel, so nothing falls between them, and the fee buys work rather than an account manager, a sales team and an office.
- The ad accounts are opened in your name. The conversion history stays yours when you leave, and Smart Bidding runs on that history.
- Rolling, not a twelve-month term. I keep the work by doing it.
I am wrong for enterprise, for brands that need cover around the clock, and for anyone who wants an account manager between them and the work. If that is you, hire from the list above. It is a good list, which is why I wrote it. Otherwise, here is how I work with ecommerce brands.
Greg Asuncion
Marketing Director, Digital Karbon
Live accounts, over the same 24 months.
The Lifeguard Store17.5xPetticoat Lane3.9xShurhold3.6x See all three case studies