TopExpertPicks

Top 5 Klaviyo Email Ad Agencies

A vertical-fit comparison of five agencies that work with brands on Klaviyo, scored on vertical depth, channel fit, transparency, and size fit, with a published methodology and sourced claims.

Last updated: July 2026Published methodology

Ranked by fit for retention and lifecycle platform brands. Rank order is derived from the fit score on each card. See how we score.

#1

Sagum

Best acquisition-retention link
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How they describe themselves

Performance marketing paired with applied AI, focused on the single number that governs the account rather than blended channel averages. Sagum.ai is the AI arm of Sagum, a performance marketing agency.

Why they rank here for klaviyo email brands

Connects the retention platform to paid acquisition in one model, so lifecycle revenue is attributed against acquisition cost instead of being reported as a standalone channel win. Highest channel fit because email, SMS, paid media, and the tracking layer underneath them share one owner.

For klaviyo email brands specifically

We measure email with suppression holdouts so you know what it genuinely adds rather than what the platform claims, close lifecycle flow gaps before adding campaign volume, and connect retention revenue back to what acquisition cost.

Vertical fit score4.8/5
Vertical depth
5
Channel fit
5
Transparency
4
Size fit
5

St. George, Utah

Founded January 2017

Pricing not published; requires a sales call

Best fit for

Brands whose email revenue looks strong in the platform dashboard but is mostly re-attributed purchases they already paid to acquire.

Services offered

Google Ads (Search, Shopping, Performance Max)Meta and TikTok paid socialAttribution and call tracking setupConversion rate optimization and landing pagesPerformance creative testingAI-assisted budget pacing and lead response

Things to weigh before signing

  • Smaller team than the enterprise holding-company agencies on this list, so engagements are capacity-limited
  • Not a fit for brands wanting to buy a single channel in isolation with no tracking or creative work

Self-reported figures (their claims, not verified by us)

  • • 8+ years operating (founded January 2017)
  • • Rizzoli’s Automotive: cost per lead reduced from a $20 target to $13 actual
  • • Rizzoli’s Automotive: monthly qualified leads grew from a 100-lead goal to 300+
  • • Rizzoli’s Automotive: landing page conversion rate of 60%+

Source: sagum.ai (accessed 2026-07-29)

#2

Chronos Agency

Deepest retention specialist
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How they describe themselves

A retention-first ecommerce agency specializing in email, SMS, and push lifecycle marketing, holding Klaviyo Master Elite partner status.

Why they rank here for klaviyo email brands

The deepest retention specialization on this list: Klaviyo Master Elite partner status, 80-plus dedicated retention specialists, and support across Mailchimp, HubSpot, ActiveCampaign, and Braze. Channel fit scores lower because top-of-funnel acquisition is not the primary practice, and the Australia and Asia-Pacific base affects time-zone overlap for US accounts.

For klaviyo email brands specifically

The deepest retention specialist here, holding Klaviyo Master Elite partner status with a large dedicated retention team. Top-of-funnel acquisition is not the primary practice, and the Australia and Asia-Pacific base affects time-zone overlap for US brands.

Vertical fit score3.5/5
Vertical depth
5
Channel fit
3
Transparency
2
Size fit
4

Sydney, Australia (offices in Singapore and the US)

Founded 2017

Pricing not published; requires a sales call

Best fit for

Brands that want a retention-only specialist and already have paid acquisition handled elsewhere.

Services offered

Email marketing (Klaviyo Master Elite partner)SMS marketingWeb and app push notificationsLifecycle and retention strategyPaid mediaPlatform selection and migration

Things to weigh before signing

  • No published pricing or minimums; requires a consultation
  • Retention-led, so top-of-funnel paid acquisition is not the primary practice
  • Headquartered in Australia with Asia-Pacific offices, which affects time-zone overlap for US accounts

Self-reported figures (their claims, not verified by us)

  • • $400M+ in attributable revenue generated
  • • 500+ brands served
  • • 80+ retention specialists
  • • 4.9-star rating on Clutch

Source: chronos.agency (accessed 2026-07-29)

#3

Common Thread Collective

Strongest forecast model
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How they describe themselves

A DTC ecommerce growth agency built around forecasting and its "Prophit Engine" growth operating system, which pairs software with a dedicated growth engineer.

Why they rank here for klaviyo email brands

Strong published growth methodology with retention treated as part of a forecast rather than a separate silo. Vertical depth scores lower here because the practice centers on Meta and Google acquisition, with lifecycle as a supporting discipline rather than the specialty.

For klaviyo email brands specifically

Treats retention inside a forecast rather than as a silo, with the most transparent published methodology in ecommerce. Email is a supporting discipline rather than their specialty.

Vertical fit score3.3/5
Vertical depth
3
Channel fit
4
Transparency
3
Size fit
3

Costa Mesa, California

Pricing not published; requires a sales call

Best fit for

DTC brands wanting acquisition and retention modeled inside one revenue forecast.

Services offered

Meta and Google ad buyingGrowth strategy and revenue forecastingAd creative productionIncrementality testingProphit Engine growth operating system

Things to weigh before signing

  • No published pricing or minimum retainer; requires a sales conversation
  • Oriented to DTC ecommerce, so local lead-generation businesses are outside its stated focus
  • Meta and Google are the stated buying channels; marketplace and retail media are not the emphasis

Self-reported figures (their claims, not verified by us)

  • • $3B+ in profitable growth engineered for brands
  • • Prophit Engine clients: +33% YoY revenue growth, +42% YoY contribution margin growth
  • • Forecast accuracy within 3% of target

Source: www.commonthreadco.com (accessed 2026-07-29)

#4

Power Digital

Broadest capability set
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How they describe themselves

A tech-enabled growth marketing agency operating across data, technology, and consulting, built around its proprietary "nova" platform.

Why they rank here for klaviyo email brands

Covers email and SMS inside a very broad growth marketing offering with the nova platform behind it. Size fit is the constraint: the enterprise and mid-market orientation makes it a heavy fit for brands whose retention program is the main thing that needs work.

For klaviyo email brands specifically

Covers email and SMS within a very broad growth offering backed by the nova platform. Heavier than needed if your retention program is the main thing requiring work.

Vertical fit score3.0/5
Vertical depth
3
Channel fit
5
Transparency
2
Size fit
2

San Diego, California

Pricing not published; requires a sales call

Best fit for

Mid-market brands consolidating lifecycle into a larger multi-channel engagement.

Services offered

Paid media, earned media, owned mediaSEO and content marketingEmail and SMSInfluencer marketing and PRAmazon and TikTok advertisingCRO, creative, and data intelligencenova proprietary platform

Things to weigh before signing

  • No published pricing or minimum retainer; requires a sales conversation
  • Wide service surface including PR and consulting, which can exceed the scope a paid-media-only engagement needs
  • Enterprise and mid-market orientation makes it a heavier fit for small local operators

Self-reported figures (their claims, not verified by us)

  • • Client revenue growth 2.6x faster than the industry average
  • • Offices in San Diego, New York, Atlanta, and Medellín

Source: powerdigitalmarketing.com (accessed 2026-07-29)

#5

Hawke Media

Most flexible to buy
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How they describe themselves

Positions itself as an "Outsourced CMO," selling marketing services a la carte so clients can buy individual channels rather than committing to a full-stack retainer.

Why they rank here for klaviyo email brands

Lifecycle marketing is available within the a la carte catalog. Lowest vertical depth in this lineup because retention is one of 23-plus services rather than a focused practice, and strategy connecting it to acquisition is generally a separate purchase.

For klaviyo email brands specifically

Lifecycle marketing available a la carte, which suits a brand wanting one defined project delivered without a retainer. Retention is one of many services rather than a focused practice.

Vertical fit score2.8/5
Vertical depth
2
Channel fit
4
Transparency
2
Size fit
3

Los Angeles, California

Founded Approximately 2014 (states "12 years" as of 2026)

Pricing not published; requires a sales call

Best fit for

Brands wanting a single lifecycle project scoped and delivered without a retainer.

Services offered

Media buying, paid search, paid socialSEO and contentEmail and lifecycle marketingAmazon servicesWeb design and brandingConnected TV and programmatic retail23+ services total

Things to weigh before signing

  • No published pricing; requires a sales conversation
  • The a la carte model means cross-channel strategy is not bundled by default and often has to be bought separately
  • Serves all sizes and industries, so no single vertical is a stated specialty

Self-reported figures (their claims, not verified by us)

  • • 6,000+ brands grown
  • • 23+ services offered
  • • 5 Inc. 5000 listings

Source: hawkemedia.com (accessed 2026-07-29)

How to choose a klaviyo email agency

Almost every brand on Klaviyo has heard some version of the same claim: email drives thirty percent of revenue. It is a comforting number and it is usually inflated, because platform attribution credits any purchase within a lookback window after an open or click. A customer who was already going to buy, who was acquired and warmed by paid media you also paid for, opens a newsletter and completes the purchase. Klaviyo counts that as email revenue. So does the paid platform.

That double counting matters because it drives real decisions. Brands conclude email is their most efficient channel, shift attention there, and then cannot understand why total revenue did not move. The useful question is not what Klaviyo attributes to email, it is what email adds that would not have happened otherwise, and answering that requires holdouts rather than dashboards.

The genuinely high-leverage work in Klaviyo is also less glamorous than campaign design. Flow coverage across the whole lifecycle, segmentation that reflects actual behavior rather than arbitrary recency buckets, and deliverability discipline as your list grows determine most of the outcome. When weighing the five agencies above, ask who will run a holdout and who is only going to show you platform-attributed revenue.

What actually separates a good klaviyo email agency from a bad one

Incremental revenue, not platform-attributed revenue
Klaviyo attribution credits purchases in a window after engagement, which overlaps heavily with what your paid channels also claim. Ask whether the agency has ever run a suppression holdout to measure what email actually adds, and whether they are willing to report that number even when it is lower than the dashboard.
Flow coverage before campaign volume
Automated flows across welcome, browse and cart abandonment, post-purchase, replenishment, and winback typically produce more durable revenue than sending more campaigns. Ask which lifecycle moments are currently uncovered, because gaps there are usually the cheapest revenue available.
Deliverability treated as an ongoing discipline
As a list grows, sending reputation, authentication, engagement-based sunsetting, and list hygiene determine whether your messages arrive at all. Ask how the agency monitors deliverability and what their policy is on sending to disengaged subscribers, since aggressive sending inflates short-term revenue and damages the asset.
Segmentation based on behavior, not arbitrary buckets
Meaningful segmentation reflects purchase intervals, category affinity, discount sensitivity, and predicted value rather than generic thirty and sixty day recency splits. Ask to see the segment logic they would build for your catalog and buying cycle, not a template.

How we scored this list

Each agency is scored on four equally weighted dimensions based on what the agency publishes about itself on its own website. Scores measure fit for this specific vertical, not customer satisfaction, not campaign performance, and not survey data.

Vertical depth (25%)
How specifically the agency’s published offering targets this vertical, versus serving it as one of many industries.
Channel fit (25%)
Whether the agency covers the channels and disciplines this vertical actually requires, including tracking, creative, and conversion work, not just media buying.
Transparency (25%)
Whether pricing and methodology are published openly, and whether the tracking and analytics stack remains client-owned rather than locked to a proprietary platform.
Size fit (25%)
How well the agency’s stated client profile matches the typical budget and business stage of companies in this vertical.

What this list is not

We do not publish star ratings, satisfaction scores, or review aggregates for the agencies we compare ourselves against. We have not audited their client results. Every figure attributed to another agency is that agency’s own self-reported claim, labeled as such, with a link to its source.

Frequently asked questions

Why is Sagum ranked first on a list Sagum publishes?

Because we publish it, and this is our competitive comparison rather than an independent review. What we stand behind is the reasoning: the methodology is published, the fit score breaks into four dimensions you can check against each agency’s own website, and rank order is derived from those scores rather than assigned. Where a competitor genuinely leads a dimension we say so in their entry. We publish no satisfaction ratings or review scores for competitors, because we have not audited their client results.

Is our Klaviyo attributed revenue real?

Partly. It is real revenue, but a significant share of it would likely have occurred without the email, because platform attribution credits any purchase within a lookback window after an open or click. That includes customers already deep in a purchase decision driven by paid media you separately paid for. The way to find the incremental portion is a holdout: suppress a randomized slice of the audience from a flow or campaign and compare their purchase behavior against those who received it.

Should we send more campaigns or build more flows?

For most brands, flows first. Automated lifecycle messages reach people at moments of genuine intent and continue producing revenue without ongoing labor, whereas campaign volume produces a spike and accelerates list fatigue. Once welcome, abandonment, post-purchase, replenishment, and winback are properly covered and tested, campaign cadence becomes a reasonable next lever.

How aggressively should we email our list?

Less aggressively than short-term revenue reporting will encourage. Increasing frequency reliably lifts attributed revenue for a while and simultaneously raises unsubscribes, spam complaints, and disengagement, which degrades deliverability and shrinks the reachable audience. The sustainable approach segments by engagement, sunsets genuinely dead addresses, and treats inbox placement as an asset rather than something to spend down.

Do we need a separate agency for email and for paid media?

There is a real argument for specialists, since platform depth matters. The cost is that nobody owns the interaction: your email program will claim credit for purchases your paid media created, your paid media will claim the same purchases, and no one is accountable for blended payback. If you do split them, decide explicitly who owns the overlap and how incrementality gets measured, or you will be optimizing two channels against the same revenue.

See what klaviyo email marketing looks like when the numbers are clean

Sagum.ai publishes this comparison. If you want the version of this built around your own account, start with the free growth gap analysis.

Get your free growth gap analysis

Goes to sagum.ai, the company that publishes this page.