12 Best Email Marketing Agencies for Ecommerce Brands: Fit, Pricing and How to Vet Them

If you want email and SMS run for you on any ESP, call InboxArmy first: it prints a $1,500 monthly minimum for managed services, the one fee any agency here publishes. Klaviyo brands that want no long-term contract should start with Flowium, DTC brands that want a full retention team with Chronos, and multichannel brands past $10M with Darkroom.

I judged these best email marketing agencies for ecommerce brands from each agency’s own site, read on November 3, 2026, on stated client fit, platforms, services and published terms. The first slot on this list is a paid placement, labeled Sponsored. The other agencies are weighed against those criteria. Still choosing the platform the agency will run? Start with my ranking of ecommerce email platforms.

Agency	Best for	Starting price or terms	Platforms named	Channels beyond email	Stated client fit
Sticky Digital	Shopify subscription brands	No price on site; free audit	Klaviyo, Recharge, Stay.ai, Ordergroove	SMS, loyalty, subscriptions	Shopify DTC, $5M–$100M+
InboxArmy	Any ESP	$1,500 per month minimum (managed services)	40+ ESPs	SMS	Startup to enterprise
Flowium	Klaviyo, no lock-in	No price on site; no long-term contracts	Klaviyo	SMS, push, WhatsApp, RCS, Instagram DM, direct mail	Ecommerce brands
Chronos	Full team, stated client load	No price on site	11, incl. Klaviyo, Attentive, Braze	SMS, push, WhatsApp, RCS, direct mail	DTC brands
BMO Media	Loyalty and reviews	No price on site; free audit	Klaviyo, Attentive	SMS, loyalty, reviews, push	DTC and ecommerce
CodeCrew	Salesforce, Sailthru or Braze stacks	No price on site; needs form	Salesforce, Sailthru, Braze, Klaviyo	SMS, loyalty	CPG, wellness, retail, ecommerce
Fuel Made	Site, CRO and Klaviyo	No price on site	Shopify, Klaviyo	SMS, CRO	Shopify DTC, ~$10M–$50M+
Darkroom	Multichannel, $10M+	No price on site	Klaviyo, Attentive	SMS, loyalty, paid media	$10M–$500M revenue
Lilo Social	Ads and retention	No price on site	Klaviyo	SMS, paid search and social	Ecommerce brands
Barrel	CPG in retail	Annual budget bands from “Under $100,000”	Shopify, Klaviyo, Recharge	SMS, SEO, marketplaces	CPG brands
Tinuiti	Email inside a media agency	No price on site	None named on its email page	SMS, on-site messaging	Startups and SMBs (Foundation)
Retention Commerce	First Klaviyo build	No price on site	Shopify, Klaviyo	Retargeting ads	Shopify merchants

Sources: Sticky Digital, InboxArmy, Flowium, Chronos, CodeCrew, BMO Media, Fuel Made, Lilo Social, Barrel, Darkroom, Tinuiti and Retention Commerce, checked November 2026.

In This Article (18 sections)

How I Chose the Best Email Marketing Agencies for Ecommerce Brands

I built the ranking from each agency’s official service, pricing and contact pages and Klaviyo’s partner directory, checked November 2026. Every revenue or ROI number here is the agency’s own claim.

The must-have filter: ecommerce email or SMS listed as a service on the agency’s own page. The first slot on this list is a paid placement. The other agencies are weighed against these criteria, taken together rather than one after another: specialist or full-service focus, platform fit and Klaviyo status, stated client size, published price or contract terms, channels beyond email, and published team and onboarding detail.

Where two agencies sit close in the matrix, one published fact decides it: Flowium lists above Chronos because it puts its contract terms in writing, which I weighed over Chronos’s wider platform range. BMO Media lists above CodeCrew because it describes itself as a lifecycle and retention marketing agency, while CodeCrew also sells web services.

CodeCrew lists above Fuel Made, which shows a Klaviyo tier and a client band, because I weighed CodeCrew’s team of 40+ experts in email, SMS and loyalty marketing and its platforms beyond Klaviyo over those two facts. Darkroom lists above Lilo Social and Barrel because it publishes both a second lifecycle platform (Attentive) and a client band ($10M–$500M in revenue).

Agency	Ads or SEO also sold	Klaviyo status	ESPs beyond Klaviyo	Price or terms	Stated client size
Sticky Digital	No (states it)	Platinum (claimed); Platinum Master (listed)	Not listed	Not listed	$5M–$100M+
InboxArmy	No (states it)	Not listed	Yes	$1,500/month minimum	Startup to enterprise
Flowium	Not listed	Elite Master (listed)	Not listed	No long-term contracts	Not listed
Chronos	Not listed	Master Elite (claimed, listed)	Yes	Not listed	Not listed
BMO Media	Not listed	Not listed	Yes	Not listed	Not listed
CodeCrew	Web services	Not listed	Yes	Not listed	Not listed
Fuel Made	Site builds, CRO	Master Elite (claimed, listed)	Not listed	Not listed	~$10M–$50M+ (Klaviyo directory)
Darkroom	Paid media, Amazon	Not listed	Yes	Not listed	$10M–$500M
Lilo Social	Paid search, social	Master Elite (claimed, listed)	Not listed	Not listed	Not listed
Barrel	Site builds, SEO	Not listed	Not listed	Budget bands	Not listed
Tinuiti	Search, social, TV	Elite Master (listed)	Not listed	Not listed	SMB offer
Retention Commerce	Retargeting ads	Not listed	Not listed	Not listed	Not listed

Sources: the agency pages linked under the comparison table, Klaviyo’s agency partner directory and its entries for Flowium and Sticky Digital, checked November 2026. “Not listed”: the agency’s pages do not state it. Klaviyo status: “claimed” is the agency’s wording, “listed” the directory’s label, and “Not listed” means neither shows a tier.

Agency sites cannot show creative quality, deliverability results or who works your account, so treat the ranking as a shortlist: ask each finalist for the two case studies closest to your category and the person who ran them.

1. Sticky Digital: Best for Shopify Subscription Brands

According to Sticky Digital, it works only in retention, for DTC brands on Shopify doing $5M–$100M+ in annual revenue, mostly in beauty, wellness, food and beverage, and apparel. That narrow fit lets a store tell from one page whether it sits inside the band.

Subscription churn is the specific job. According to Sticky Digital, it builds flows, cancellation interventions and winback sequences for brands on Recharge, Stay.ai and Ordergroove. Next to BMO Media, which also lists subscription work, Sticky Digital names the apps and a revenue band, which my profile of Sticky Digital covers in more detail.

Read its site as claims, though the partner claim checks out: Klaviyo’s directory lists Sticky Digital with the Platinum Master label. The services page says it does no paid media, SEO or brand design, while the homepage also lists conversion rate optimization; ask which the retainer covers. The homepage says it was “Voted #1 Retention Marketing Agency In North America 2023 + 2024” without naming who ran the vote.

Skip it if:

your Shopify store is under $5M a year, where Retention Commerce (Shopify setup work) fits better, or your store is not on Shopify, where InboxArmy (any ESP, printed minimum) is the call to make.

2. InboxArmy: Best for Email and SMS Run on Any ESP

InboxArmy is the first call to make when your ESP is not Klaviyo, or when you want a number before the discovery call, because it supports more than 40 email platforms and prints its minimum for managed services. It sells only email and SMS (“No SEO. No social media. No PPC.”). The trade-off: ecommerce is one of 25+ industries it serves, so ask for case studies from stores like yours.

The engagement ladder is the practical difference. InboxArmy sells template production, where its team designs templates your staff fills and sends, and part-time work it calls a Dedicated Resource contract, where a team creates, sends and reports on the campaigns you pick, in your time zone. A brand with one in-house marketer can start with templates and buy more only when results justify it.

The timeline is written down too. ESP access is requested on day 1, the kickoff call falls in weeks 1-2, the first campaign goes live in weeks 5-6, and automation builds typically go out in week 6.

Skip it if:

you want one agency to run paid social and email together; Lilo Social and Darkroom put both under one roof.

3. Flowium: Best for Klaviyo Brands That Want No Long-Term Contract

Flowium is the agency to call when the contract matters as much as the creative. It promises no long-term contracts and a 2-year price lock, and its services page lists what every plan includes. Flowium also maintains and manages the Klaviyo account itself, which suits a brand with no in-house Klaviyo admin; settle account ownership in writing.

Every Flowium plan carries the same Premium Service: 6 email marketing experts per project, Klaviyo account setup and management, custom copy and templates, flow strategy and build, a monthly campaign calendar, segmentation, A/B testing, monthly reports and weekly calls. Hold any other agency’s retainer proposal against that list.

Flowium also says it carries insurance across 8 risk categories, including privacy breach and errors and omissions; ask every finalist the same question. Against Chronos, it wins on written terms and loses on platform range: its plan names only Klaviyo. Klaviyo’s partner directory lists Flowium with the Elite Master label.

Before you compare quotes, my Klaviyo review is the next step.

Skip it if:

you run Omnisend, Braze or Salesforce and do not plan to move to Klaviyo; InboxArmy or CodeCrew work on those stacks.

4. Chronos: Best for a Full Retention Team With a Stated Client Load

Of the twelve agencies here, only Chronos states how many brands share its team. About 80 Chronos staff look after around 60 brands, and each client gets a strategist, a day-to-day lead, a copywriter, a designer and a team that checks every asset from day one. That makes it the pick for a DTC brand that wants to know its team before it signs.

The measure matters as much as the team. Chronos judges email, SMS and push against what a customer is worth in gross profit over the whole time they buy, not attributed revenue alone. It also works across Attentive, Postscript and Braze, so an existing SMS program does not have to move.

Chronos calls itself a Klaviyo Master Elite Partner, and Klaviyo’s directory lists it with the Elite Master label. The same listing puts its headquarters in Singapore with an office in Sydney, so ask how US business hours are covered.

Skip it if:

you need a published price before you take a call; InboxArmy prints one.

5. BMO Media: Best for Loyalty and Reviews Run With Email and SMS

BMO Media’s case rests on scope. It runs email, SMS, loyalty, reviews, push and subscriptions as one coordinated program on Klaviyo or Attentive, so a brand whose repeat-purchase problem sits partly in reviews and loyalty briefs one team instead of three vendors.

Reviews are treated as a retention channel: BMO says it turns post-purchase moments into reviews and UGC, then uses them in flows, on product pages and in ads. On loyalty, it says it sizes a program’s economics before building it; ask to see that model in the audit. If the SMS tool itself is undecided, compare SMS marketing platforms first.

Skip it if:

you only need flows built and templates designed; Retention Commerce sells that smaller job.

6. CodeCrew: Best for Salesforce, Sailthru and Braze Stacks

CodeCrew earns its place at the technical end of email. It takes what it calls an “agnostic” approach and lists Salesforce, Sailthru and Braze beside Klaviyo and Omnisend, and Twilio for SMS. For a Salesforce or Sailthru stack where an ESP migration is off the table, that matters more than a Klaviyo badge. The catch is that pricing starts with a form, not a number.

Render testing, deliverability tracking and inbox performance tracking are listed services, so a brand with heavy custom templates in Salesforce or Sailthru gets coding and QA from the team that plans its campaigns. Next to InboxArmy, the other platform-agnostic pick, CodeCrew adds Twilio and loyalty work but publishes no minimum or onboarding timeline.

Skip it if:

you are a small Shopify store that only needs Klaviyo flows set up; Retention Commerce sells that narrower job.

7. Fuel Made: Best for Shopify Storefront, CRO and Klaviyo Under One Team

Fuel Made makes sense when the email program is not your only leak. It pairs Shopify design and development and continuous A/B testing with Klaviyo email and SMS, so a brand whose product pages and flows both underperform can brief one team instead of two. It is a Shopify-and-Klaviyo shop by its own description, so stores on other platforms should look elsewhere.

Its homepage case studies mix storefront results such as page speed with welcome-flow and abandoned-cart work. Its Klaviyo directory listing carries the Elite Master label and says it has been Shopify-exclusive since 2010. Against Barrel, Fuel Made is not tied to CPG or retail, the simpler fit for a pure DTC store.

Skip it if:

your store runs on another platform, sells under about $10M a year (the bottom of the band in its Klaviyo directory listing), or you only need email. CodeCrew works across stacks, Retention Commerce sells done-for-you ecommerce marketing automation for Shopify stores, and InboxArmy sticks to email and SMS.

8. Darkroom: Best for Multichannel Brands Doing $10M+

Darkroom tells you who it is not for, in its own FAQ. It targets consumer brands typically doing $10M–$500M across several channels and calls the fit poor for single-channel brands and companies under roughly $5M. Inside that band, retention sits next to Amazon, TikTok Shop, paid media and measurement in one program: Darkroom is the pick when email is one lever among many.

Measurement is the reason a large brand would put retention inside a growth agency. Darkroom says performance is measured in contribution profit and checked with media mix modeling and incrementality testing, rather than last-click attribution. Against Tinuiti, Darkroom states its revenue band and names its lifecycle tools; Tinuiti’s email page does neither.

Skip it if:

your store is under roughly $5M or sells in one channel; Darkroom itself says a channel specialist moves faster, and InboxArmy or Retention Commerce are that specialist here.

9. Lilo Social: Best for Pairing Paid Social and Search With Retention

Lilo Social is for the brand whose email problem and ad problem are the same problem. It runs full-funnel paid search and social alongside email and SMS retention, and reports both against P&L and breakeven numbers. The trade-off: retention is one of its two service lines.

With one team owning ad spend and the flows that bring those buyers back, you can ask it to defend contribution margin rather than ROAS and email revenue separately. Weigh its partner claim, though: Lilo Social says Elite is held by “only 0.2% of 6,500+ partners,” while Klaviyo’s partners page counts 6,000+ agency partners and prints no share for Elite.

Skip it if:

you want an email-only specialist that will not sell you ad management; InboxArmy and Sticky Digital both say they sell no paid media.

10. Barrel: Best for CPG Brands Selling DTC and in Retail

Barrel fits a CPG brand whose email has to sell in stores as well as online. It works with DTC-led and retail-first CPG brands on Shopify builds, lifecycle marketing and marketplaces, and one of its email case studies sends cider buyers to the product at their local store. A non-CPG store, or one that only needs email, pays for range it will not use.

Its partners (Shopify, Recharge, Rebuy, Klaviyo) and a build-a-box subscription welcome flow among its case studies put site, subscription app and email in one plan. Against Fuel Made, Barrel adds the retail side; Fuel Made is the leaner pick for a DTC-only Shopify brand.

Skip it if:

you are not a CPG brand or want email run on its own; Flowium runs a Klaviyo program without the site work.

11. Tinuiti: Best for Adding Email to an Existing Media Agency Relationship

Tinuiti makes sense when your media agency is already Tinuiti, or about to be. Its Email & SMS service covers performance email, ESP selection and migration, and on-site marketing, beside search, social, Amazon, TV and affiliate. The gap is detail: its email page names no ESP, team or fee.

ESP migration is the part worth testing: ask who does the build and how long the cutover takes. Foundation, its offering for startups and SMBs, means no stated revenue floor, unlike Darkroom.

Skip it if:

you want an agency whose Klaviyo work you can judge from its own site; Chronos and Flowium publish team and plan detail.

12. Retention Commerce: Best for Small Shopify Stores Setting Up Klaviyo

Retention Commerce homepage, first screen, retentioncommerce.com, captured Nov 2026

Retention Commerce is the smallest-scope option here, and that is the reason to call it. It sells done-for-you marketing automation for Shopify stores: Klaviyo flows, reusable templates, app integrations, a move to Klaviyo from another ESP, campaign scheduling, and Facebook retargeting synced to Klaviyo segments. A store that needs the basics built should ask for a project quote; one that needs SMS, loyalty or strategy should not.

A migration with rebuilt flows and templates is a defined project with an end, easier to price and judge than an open retainer. Against Flowium, Retention Commerce sells setup and campaign management but lists no SMS, loyalty or strategy team.

Skip it if:

you need SMS, loyalty or a strategy team; Chronos or BMO Media run those programs.

How Ecommerce Email Agencies Charge

Of the agencies above, InboxArmy alone prints a fee: a $1,500 monthly minimum for managed services. Barrel’s form shows annual budget bands; the other ten print no price, so the table below sorts the engagement types their sites describe.

Model	What you get	Example on this list	Watch for
Monthly retainer	A standing team for flows, campaigns, testing and reports	InboxArmy minimum $1,500 per month; Flowium plan list	Scope not written down
Project fee	Templates, a flow build, a migration or an audit	InboxArmy templates; Retention Commerce setup	Who keeps templates and flows
Part-time or dedicated team	Named staff on your account	InboxArmy Dedicated Resource contract	Hours or deliverables per month
Annual engagement	A scoped year of site and lifecycle work	Barrel bands from “Under $100,000”	Email folded into a site budget
Performance or revenue share	A fee tied to attributed revenue	None of the agencies above offers one on its site	The attribution window

Budget from InboxArmy’s managed-services minimum. If billing starts at kickoff, the two months up to its first campaign in weeks 5-6 cost $3,000 ($1,500 x 2). A three-month trial before you judge results costs $4,500 ($1,500 x 3).

If flows are new to your team, read how marketing automation works before the first call.

Timing matters this month. InboxArmy’s timeline puts a first campaign at weeks 5-6, so an agency hired in early November mostly shapes your program after Black Friday; Sticky Digital’s complimentary BFCM audit is a review of your program, not a send.

Agency, In-House or Freelancer?

An agency fits when you need several skills at once, and a hire fits when one channel drives your growth and you can find senior talent for it. InboxArmy argues that a freelancer gives you one person’s bandwidth while an agency gives you strategists, designers, coders and copywriters, typically for less than one full-time hire. Both are sellers’ arguments.

To test it, set InboxArmy’s $18,000 yearly managed-services minimum ($1,500 x 12) beside the seven roles it staffs, from Account Manager to Copywriter, and against your own cost for one hire.

How to Choose and Vet an Ecommerce Email Agency

Start from stated fit (your revenue and your ESP), then check the agency’s Klaviyo status in Klaviyo’s own directory, keep the ESP account in your company’s name, and treat every revenue or ROI number as unaudited until the agency shows its method.

Your priority	Agency to call	Reason	Trade-off
An ESP other than Klaviyo	InboxArmy or CodeCrew	40+ ESPs; Salesforce, Sailthru, Braze named	CodeCrew prints no fee
Klaviyo with no lock-in	Flowium	No long-term contracts	Flowium runs the account
Knowing who works your account	Chronos	About 80 people for around 60 brands	No fee on its site
Shopify subscription brand	Sticky Digital	Recharge, Stay.ai and Ordergroove work	Stated fit: Shopify DTC
Loyalty and reviews	BMO Media	Six channels in one program	No size band
Storefront and email	Fuel Made	Shopify builds, CRO and Klaviyo	Shopify only
Over $10M across channels	Darkroom	Stated multichannel fit	Poor fit for small stores
Ads and email	Lilo Social	Paid media and retention in one team	Email is one of two lines
CPG brand in retail	Barrel	DTC and retail CPG focus	Scoped by annual budget
One media agency for everything	Tinuiti	Email inside a media agency	No ESP named
A first Klaviyo build	Retention Commerce	Setup and migration	No SMS or loyalty

Use an audit as a work sample. Chronos offers brand, flow, campaign, traffic and Klaviyo data audits, and Flowium’s free audit reviews flows, campaigns, opt-ins, template design and KPIs; ask every finalist for the written output and compare what each found.

An agency cannot fix a platform that does not fit your list; the wider email marketing platform ranking covers lists beyond ecommerce.

CPG and wholesale brands whose customer data lives outside the ESP may need ecommerce CRM options before an agency.

Who Owns the Klaviyo Account?

Create the Klaviyo account under a login your company controls, then add the agency as a user. Klaviyo allows one Owner per account, makes the first person to create it the Owner by default, and lets only the current Owner transfer ownership; its help center says Klaviyo cannot start a transfer without the current Owner’s approval.

An Admin has full account access and can add or delete users but cannot fully close the account, so the agency as Admin and you as Owner lets it work while you keep the flows, lists and history. Klaviyo’s Manager role limits flows, lists, segments and analytics, which suits an agency that only runs campaigns.

Agencies take two models here: InboxArmy’s onboarding requests access to your ESP on day 1, while Flowium says it maintains and manages your Klaviyo account. Ask which model you are buying, and write into the contract that templates, flows and segments stay in your account when you leave.

Sources: Klaviyo user roles reference and Klaviyo ownership transfer guide, checked November 2026.

Red Flags

Walk away from an agency that shows any of these:

• A revenue promise before the audit. InboxArmy’s own FAQ says an agency quoting a number before it knows your program is “either guessing or selling you something.”
• A long lock-in with no exit clause. Flowium shows the terms can be written plainly.
• A tier you cannot find. Klaviyo’s directory shows labels such as Elite Master, Platinum Master, Silver Master and Platinum Advisor; a claimed tier should match the listing.
• Nobody owns SMS consent. Ask who keeps opt-in records for texts; take legal questions to your own counsel.

Questions to Ask on the First Call

Use the answers the agencies above publish as the benchmark:

1. How many people work across how many brands, and who leads my account? (Chronos, agency-wide: about 80 people for around 60 brands.)
2. Who works on the account, by role? (InboxArmy names seven roles, from Account Manager to Copywriter.)
3. When does the first campaign send, and when do flows go live? (InboxArmy: weeks 5-6.)
4. Whose login is the ESP Owner, and which role does the agency need?
5. What does the monthly fee include, line by line?
6. What is the notice period, and what stays with the brand at exit?
7. Is the price fixed, and for how long? (Flowium: a 2-year price lock.)
8. Which attribution window sits behind the agency’s revenue numbers?

How to Read Agency Revenue and ROI Claims

You cannot compare these numbers.

Agency	Headline claim	What it measures, as worded	What the page leaves out
Sticky Digital	4200%	“Average return on investment with email marketing”	Whose clients, which period
Chronos	3500%	“Average client ROI”	Cost basis, attribution window
CodeCrew	Over 1,300% ROI	ROI averaged for its clients	Cost basis, attribution window
BMO Media	15X	“Return on investment”	Period and spend
InboxArmy	$1B+	“Email Revenue Generated”	Attribution window
Flowium	$1B+	“Revenue driven”	Attribution window

Sources: Sticky Digital homepage, Chronos, CodeCrew, BMO Media, InboxArmy and Flowium, checked November 2026.

Also Considered

Four more agencies came up in the top results and stayed off the list:

• Hawke Media: an outsourced-CMO, full-service agency whose homepage names no email service.
• Alchemy Worx: an email and SMS agency whose homepage names no service list, platforms or price beyond one case study.
• Coalition Technologies: a general agency selling email beside SEO, PPC and social, with law firms, dental and real estate among the industries on its email page.
• Andzen: andzen.com now opens Cendix, a web-to-print company, so there was no Andzen page to judge.

Frequently Asked Questions

What is an email marketing agency?

An email marketing agency is an outside team that plans, designs, codes, sends and reports on your email, and often SMS, inside your own ESP. For ecommerce that usually means flows such as welcome and abandoned cart, a campaign calendar, segmentation and testing, run on a monthly retainer or a scoped project.

Do these agencies work with Omnisend, not just Klaviyo?

Yes, several do. InboxArmy, CodeCrew and Chronos all list Omnisend among the platforms they work with. Flowium, Fuel Made and Retention Commerce center their work on Klaviyo, and Retention Commerce lists migration to Klaviyo as a service, so an Omnisend store should start with the first three.

Is an agency worth it for a store under $1M?

Usually only for a scoped project. Darkroom calls its fit poor under roughly $5M and Sticky Digital states a $5M floor, while InboxArmy’s managed services start at its monthly minimum. A smaller store gets more from template work or a fixed setup project than from a full retainer.

Final Verdict

Call two or three agencies that match your job; no agency here proves results you can compare, so pick by job. For any ESP and a printed price floor, call InboxArmy. On Klaviyo with no lock-in, Flowium; for a full team with a stated client load, Chronos; for multichannel brands over $10M, Darkroom.

The rest fit narrower jobs. CodeCrew suits Salesforce, Sailthru or Braze stacks, and Sticky Digital suits Shopify subscription brands. BMO Media fits loyalty and reviews, Fuel Made storefront and email, Lilo Social ads and email, and Barrel CPG brands in retail. Tinuiti works inside a media relationship, and Retention Commerce handles a first Klaviyo build.

Whichever you pick, keep the ESP Owner login in your company’s name and buy an audit or project before the retainer; that protects you more than any badge or ROI figure.