Email is expensive because most agencies still do it by hand. Somebody writes six subject lines, somebody builds the same welcome flow for the ninth time this year, somebody QAs the links, somebody pulls the numbers into a Friday deck. None of that is the creative part and all of it is billable. I spent a decade building email tools. SmartrMail had 12,000 customers and sent 6 billion emails before it was acquired in 2022, and that side of the job is a grind: hours spent composing and optimizing, and testing that is dumb, A/B at best, with no learning back. That is not a swipe at the people doing it by hand. I spent a decade building tools for exactly that grind. The firms worth paying are the ones that have automated the mechanical half and still produce email a person would want to open, and that is the only thing I am ranking for below.
1. Alchemy Worx
1Alchemy Worx
Shahar Brovender, Chief Technology Officer, Alchemy Worx
- Best for
- Predictive email at enterprise volume
- Founded
- 2001
- Team size
- More than 100, across seven offices
- Location
- Manhattan headquarters, seven offices on three continents
- AI stack
- Subject Line Pro, Intelligent Automation
The only firm in the pool that turned the mechanical part of email into software it owns. Subject Line Pro reads against a database of more than 21 billion emails and predicts open, click and delivery rates before a campaign goes out, and the same case study carries Laura Geller at 140 percent more revenue. Shahar Brovender brings 35 years in IT and a record of Gen AI and machine learning projects to that work, though as a fractional CTO.
My observation from the tool-building side is that even with multivariate testing, the learning is hard to bring back into the next subject line. The firm's own caution that AI subject lines can quietly undermine deliverability is that instinct in public. No awards and no published ESP partner tier, so the proof is 27 named clients.
Take it when the volume is high enough that predicting a send beats testing one, and you want the tooling to come with the agency.
2. Lilo
2Lilo
Zac Fromson, Co-Founder, Lilo
- Best for
- Retention with a deep proof shelf
- Founded
- 2016
- Team size
- Over 50
- Location
- Brooklyn office, CEO in Brooklyn and co-founder in the New York City metro area
- ESP
- Klaviyo Master Elite
- AI stack
- Klaviyo lifecycle automation, Triple Whale attribution, Automated GA4 and Data Studio reporting
Lilo has the deepest published proof in the set for an email brief, eight case studies carrying real numbers and most of them retention. The Animal build names the actual flows, including a replenishment flow timed to land before the next subscription charge, plus post-purchase, abandoned cart, browse abandonment, winback and an SMS-only welcome. Half Magic Beauty is 390 percent revenue year over year. Zac Fromson is a Klaviyo Champion in 2025 and 2026 and went live with Klaviyo on AI-powered personalization and lifecycle optimization.
My benchmark from a decade of watching Shopify stores is that once a store passes 25 percent of revenue attributed directly to email clicks, it is doing email right, and that is the line Lilo publishes numbers against rather than around. No proprietary tooling, and paid media, UGC and creative sit next to retention.
Take it when you want the receipts up front and a Brooklyn team that will put its name on the number.
3. Roswell
3Roswell
Emily Roberts, Vice President, Growth Marketing, Roswell
- Best for
- Retention that needs engineering
- Founded
- 2011
- Team size
- More than 40
- Location
- Rooted in New York City, with leadership in Manhattan and Jersey City
- ESP
- Klaviyo, Attentive, PostPilot, Stay AI, Yotpo, Rebuy, Loyalty Lion, Okendo
Call Roswell when the email program keeps failing on something that is not email. Co-founder Hugh Lim was a development manager first, and retention sits next to that engineering rather than underneath it. On one client the team migrated everything onto Klaviyo, rebuilt the full automation suite and deployed Digioh so anonymous sessions became identified subscribers, the step most lifecycle programs skip. Adina Reyter is the most email-specific number here: email revenue up 70 percent, flow revenue up 394 percent.
We once had a merge guard misread a minified CSS brace as a broken merge tag, which blocked valid emails and dropped contacts out of entire sequences, invisible from inside the email tool. Emily Roberts is building the internal playbooks around Claude, and the AI tools on the site are partner products rather than things Roswell built.
Take it when the email program keeps breaking on something that is not email.
4. Flowium
4Flowium
Andriy Boychuk, Founder, Flowium
- Best for
- Messaging channels and nothing else
- Founded
- 2017
- Team size
- More than 70
- Location
- Founded in New York as Email Marketing NYC, founder in the New York City metro area, delivery team in Poland, North Macedonia, South Africa and Brazil
- ESP
- Klaviyo Elite Master
The purest retention shop in the pool. Nothing on the service menu is not a messaging channel: email, deliverability, Klaviyo, SMS, push, WhatsApp, RCS, Instagram DM and direct mail. Andriy Boychuk industrialized that by organizing people around email rather than by writing software, and it works: Chaparral Motorsports flow revenue went from $150,539 to $252,452.
On AI the firm is a commentator rather than a builder, and a good one, reporting that Klaviyo is going headless so Claude and ChatGPT can query customer data directly. Boychuk put the thesis of this page better on X than I am going to: AI will not kill email marketing, it will kill lazy email marketing. He is also the only leader in the metro area, so the New York claim is heritage rather than an office you can visit.
Take it when the brief is email, all of it, done by people who do only that.
5. Taktical
5Taktical
Christian Miller, Director of Operations, Taktical
- Best for
- Email inside a performance program
- Location
- New York City, with four of five leaders listed in the metro area. Now a MediaMint company.
- AI stack
- AI agents in internal operations, AI-automated technical SEO audits and data structuring
The opposite profile at the same total. Where Flowium organized people around email, Taktical automated the agency itself. Christian Miller leads AI adoption and agentic operations, automating technical SEO audits and the data work behind client reporting. That is the mechanical work gone from inside the agency rather than sold as a service. The firm hosts panels with people who have actually put AI agents into production and publishes Chomps going from 164 to 2,867 ChatGPT sessions.
Email has its own results, Stinger at 139 percent campaign open rates year over year, but it is one line on a 22-service menu led by paid search and paid social. The site says award winning and lists no awards. And this is not an independent shop: MediaMint acquired Taktical in December 2025 and folded the team into a 3,000-person global workforce, with both founders now EVPs.
Take it when email is one channel in a wider performance brief and you want the agency's own work automated too.
6. Barrel
6Barrel
Val Geisler, Director of Strategy, Barrel
- Best for
- CPG design with an AI practice
- Founded
- 2006
- Location
- New York City market, with leadership in Greater Philadelphia, Ohio and Florida and the co-founder in the New York City metro area
- ESP
- Klaviyo Gold
- AI stack
- Claude, MCP servers in delivery workflows, Lovable, Gigit
A design studio with a new and serious AI practice rather than a mature one. Val Geisler architected the agency partner program system using Claude, Lovable and MCP, after Customer Advocacy Lead at Klaviyo and Chief Email Officer at Fix My Churn. My shorthand for why that plumbing matters is that Claude does not need MCP to call an API, it needs MCP to know which API to call.
CEO Lucas Ballasy is the better witness. He built the firm's internal account and financials dashboard himself with Claude Code, then posted a pet peeve about Claude-generated decks that look on brand while the voice reads as slop. A firm that can say both in public has used the tools. Sixty-two named clients, with McCormick up 36 percent in gross sales. Both AI hires are three months in, so the practice is new.
Take it when the work has to be beautiful and you want the people building the AI workflows on the same team.
7. DIDO
7DIDO
Roman Hotsiak, Founder, DIDO
- Best for
- Done-for-you email, Brooklyn based
- Founded
- 2017
- Team size
- More than 30, from 14 countries
- Location
- Brooklyn headquarters, every person the research surfaced in Brooklyn or the New York City metro area
- ESP
- Klaviyo Gold, Sendlane, Okendo, Gorgias, Yotpo, Recharge
- AI stack
- Klaviyo AI
The mirror of Barrel: an email shop with nine years of doing one thing, where every service on the menu is email or SMS. Roman Hotsiak is Klaviyo Product Certified with a long hands-on automation history across AMOCRM, Manychat chatbots and three ESPs.
This is the clearest case of an agency that is excellent and mostly manual. The automation claims sit on a Klaviyo partner page describing what the platform can do, and the posts explain Klaviyo AI to the audience rather than showing work. My view, after a decade of looking at ecommerce email, is that personality, restraint and a point of view beat generic polished templates. One thing I will not repeat: the headline 404x, 880x and 950x quarterly ROI are published by product category, not by named client, so they cannot be traced to a brand.
Take it when you want email specialists in your own time zone and are happy to judge the work on the flows rather than on the AI.
8. Agency 6B
8Agency 6B
Vix Reitano, Growth Partner, Founder and CEO, Agency 6B
- Best for
- Lifecycle and CRM systems
- Location
- A Manhattan suite on Prince Street, with both people the research surfaced listed in New York
- AI stack
- Custom AI marketing systems, built by the founder
Vix Reitano is the whole case, and it is a strong one. She created the AutoMagic Assembly for founders building AI-powered marketing systems and has been putting AI into client operating systems since 2020. Her diagnostic covers data and analytics, paid media, website, email list, sales stack and AI search visibility: pipeline architecture with email running through it rather than being the point, and she is open on X that automation is how she runs the business.
My read is that startups wire up their transactional email, hire someone for campaigns and ignore everything in between, and the rest is where the revenue actually is. The best published result is Erin Stetzer Homes, a $140,364 course launch on $3,017 of paid spend. Four of the seven case studies are unnamed brands, and the capability sits in one person.
Take it when you want a systems builder rather than a campaign team, and you want that person in the room.
9. Group 8A
9Group 8A
Eric Samson, Founder and Managing Director, Group 8A
- Best for
- Merchant-driven email for retail
- Founded
- 2009
- Location
- New York City, with the founder in Manhattan across a 17-year tenure and the COO in India
The most specific point of view on email in the bottom half of this list. Group 8A describes aligning inventory, seasonality, the retail calendar and promotional cadence, which is a merchant's way of thinking about email rather than a marketer's. Eric Samson founded the firm after running ecommerce at Marc Ecko Enterprises.
My own numbers put the average Shopify store at 10.5 emails a month, rising to daily in the last week before Black Friday, and planning that against sell-through rather than a content calendar is the harder version. All seven case studies carry a number and two are email results, Blowfish at 95 percent more total opens and 45 percent more total sales. The AI work is all client-facing answer engine visibility, which Samson argues may force companies to optimize reality itself, with nothing published about AI inside the firm's own delivery.
Take it when the email calendar has to answer to inventory, and you want people who have run that for seventeen years.
10. Omnycode
10Omnycode
Amjad Bukhari, Retention Marketing Consulting Partner, Omnycode
- Best for
- Store engineering with email attached
- Location
- Midtown headquarters on Broadway, retention partner in the New York City metro area
- ESP
- Klaviyo, Attentive
- AI stack
- Shopify Flow, ShipperHQ
Genuinely best at something none of the other nine lead with: fixing the store so the email can work. The published automation is the practical kind, Shopify Flow tagging orders, sending low-stock alerts, unpublishing out-of-stock items and triggering Klaviyo flows and algorithmic shipping optimization through ShipperHQ, shipped for clients rather than a banner on a page.
Retention is led by Amjad Bukhari, a Klaviyo Product Certified consulting partner who built his retention practice at WERTEC. The email point of view is stated in one line on the firm's own site, that email is a revenue channel and not a communication tool, with twenty named clients behind it and BigCommerce builds like Chris Christensen at 20 percent more revenue year over year. Email is one of fourteen services and retention runs through a consulting partner rather than an in-house department.
Take it when the email problem is really a store problem and you want the people who will fix both.
Also worth knowing
Thirteen more firms came through the research and I am naming them here rather than dropping them, because a list that only shows its winners is not showing its work.
NoGood (31) has the best AI evidence and the strongest New York bench in the pool, held out only because email is one line on a full-stack growth menu.
Tinuiti (26) has a patented machine-learning media platform and a Meta MCP running in production, but 1,200 people nationally and New York is the origin story rather than the team.
Netalico (26) reports Oatly at 188 percent subscription revenue growth in three months, the best single result in the pool, but nothing outside the firm's own site corroborates the team or the New York presence.
Moburst (25) has a dedicated VP of Artificial Intelligence and proprietary AI products, at an agency whose own site puts email marketing 29th on a media buying list.
Atelier Commerce (23) is a genuine New York lifecycle shop with Klaviyo, Attentive, Postscript and Yotpo partnerships that has published no client names or results to point readers at.
Digital Drew SEM (23) has a credible email page with real machine-learning subject line and send-time claims, Google Premier Partner status, and a bench too small to verify.
Splash Creative (22) states the thesis of this page outright, finding manual workflows AI can replace and putting them into production, without a named client workflow to show it.
MIKI NYC (22) is a Brooklyn email and SMS boutique with visible craft and the thinnest published evidence of the email-only firms.
EverKeep Marketing (21) has retention-only positioning, a Broadway address and four real DTC client names, with no case studies and no verifiable team.
Lounge Lizard (20) is a 28-year New York web agency with deep case study volume, where email is a line item and the results on the email page are actually paid search and organic.
Digital Dot (20) has strong organic search results and real shipped automation software in MoversTech CRM, with most of the leadership in Dubai and Serbia.
G&G Creative (16) is a New York B2B industrial studio where email is retainer support work and the company posts contain no AI material at all.
Cogney (14) is a technically excellent search consultancy with Airbnb and Coinbase on the client list, operating from Hong Kong despite a Broad Street address.
How to choose between them
If your volume is high enough that subject line testing has stopped teaching you anything, you want prediction rather than more tests, and Alchemy Worx is the only firm here that owns that capability rather than renting it. If you want to know what you are buying before you buy it, Lilo has published more checkable numbers than anyone else on the list. If your flows keep breaking on data, tagging or identification, Roswell has engineers where most agencies have account managers.
If the brief is email and only email, take Flowium when you want email, SMS, push, WhatsApp and RCS run by one team and you can work with a delivery bench in Poland, North Macedonia, South Africa and Brazil, and take DIDO when you want people in Brooklyn in your own time zone doing email and SMS and nothing else. Both are mostly manual, which I am stating as a strength: a Klaviyo Elite Master partner tier and a team who do nothing else are worth more to most brands than a homepage with an AI banner on it. Taktical and Barrel earned the same totals from the other direction, less specialized and more automated, with more of their own work already handed to software, and in both cases you are buying into a platform relationship as well as an agency: Taktical is now a MediaMint company and Barrel reached Shopify Platinum in July 2026.
If the email problem is downstream of something else, stop shopping for an email agency. Agency 6B builds the lifecycle and CRM plumbing, Group 8A plans the calendar off inventory, and Omnycode fixes the store data the flows are firing on. Any of those three will save you from hiring a retention shop to work around a problem it cannot see.
When you do hire a retention shop, ask how much of the build is repeated from its last client. I described that habit on SaaS Stories in September 2026: "We'll go in, we'll create all this stuff and then we'll just go in and kind of redo it. Like that, that seems insane, you know, in this day and age." Ask what it would cost to set up the same flows again from a prompt.
How this list is ranked
Twenty-six firms went into the pool and ten came out. The gate was narrow on purpose: a firm only ranks among the best email marketing agencies in New York if email marketing is a core service on its own site, not the twenty-ninth item on a media buying menu. Three well-known names cleared the score and did not clear that gate, and I have named them above rather than quietly dropping them.
Each of the four criteria rewards something different. Specialization rewards a firm whose service menu is messaging and little else, because craft comes from repetition. AI capability rewards published evidence of automation inside the firm's own delivery, not a banner. Evidence rewards named clients, numbers that can be traced to a brand, awards and partner tiers that can be checked. City presence rewards people actually in the metro area rather than a heritage address. Scores are out of 10 on each and the total is out of 40. They are my scores against those criteria and nothing else, and no third-party rating is republished anywhere on this page as structured data or as prose.
How this list is ranked
I score every agency here out of 40, ten points each for specialization, AI capability, published evidence and a real New York team. The scores are mine, against those four criteria and nothing else. I score blind, from published evidence, before I open any customer list, so using Nitrosend is worth zero points and is disclosed on the card where it applies.
Nitrosend is the company I co-founded. It sells email infrastructure to agencies and is not an email marketing agency itself, so it does not appear on this list and could not. Nobody paid for a place here, and no place on this list is for sale.
I score AI capability because Nitrosend publishes this list and Nitrosend is built for agencies that run client email from an AI agent. That is my commercial interest and you should read the list knowing it. An agency that adds real AI capability will score higher here the next time I check this page, and Nitrosend for agencies is one way to do that and not the only one. I score claims on evidence rather than on banners: a named tool, a named workflow, a case study with a result, or an AI role on the team page. Every AI claim here links to its source.
The scoring is positive only: a lower score means less specialized for this brief, never a worse agency, and all 10 entries say what that firm is genuinely best at.
Two pairs on this list are tied. Flowium and Taktical are both on 30 and Barrel and DIDO are both on 29, and in each pair the points are earned in opposite columns: one firm is the deeper email shop, the other has automated more of its own work. Neither is the better agency, so the order inside a tie carries no meaning and I have not invented a gap. One thing to know while you read my scores: Nitrosend is the company I co-founded, it publishes this page, and it sells email infrastructure to agencies. Nobody paid to be here and there is no entry to buy.
If you are an agency reading your own entry and you want the AI score to move, the thing that moves it is published evidence: one named workflow, one case study with a number, one role on the team page with the work described. What changed is that agents now build the campaign, segment the audience, draft the copy and stage the send, and the marketer is the director rather than the operator, with a human still on the send button. Nitrosend for agencies is one way to produce that evidence, because multi-brand client sending run from an agent leaves a workflow you can point at, and it is not the only way.
FAQ
Alchemy Worx, if you are picking one name with no other constraint, because it has been email-first since 2001 and it is the only firm in this pool that owns the send prediction model it runs rather than renting one from an ESP. From there the shortlist splits four ways: Flowium or DIDO if the brief is email and nothing else, Lilo if you want published client numbers before you sign anything, Roswell if the flows keep breaking on data rather than on copy, and Taktical if email is one channel inside a paid performance program.
Those are not interchangeable picks, and the difference is visible in what each firm chooses to publish. Lilo names the actual flows it built for Animal, replenishment timed to the next subscription charge included. Roswell publishes the migration, the rebuilt automation suite and the identification layer it deployed. Flowium publishes a client's flow revenue moving from $150,539 to $252,452. Read those three and you will know which of them is describing your problem.
Between $2,000 and $15,000 a month on retainer, and a store sending my own average of 10.5 emails a month sits in the middle tier at $5,000 to $7,500. Onboarding or migration is quoted separately, at $3,000 to $10,000 from a small shop and $10,000 to $25,000 from an established one, and hourly work at an established agency runs $150 to $200.
Those numbers are published rather than guessed, and one of the firms ranked on this page published them. Flowium, fourth here, puts a low-end retainer at $2,000 to $3,000 a month for five to ten emails, a mid-range retainer at $5,000 to $7,500 for ten to fifteen, and a high-end retainer at $10,000 to $15,000 for fifteen to twenty or more with advanced segmentation, deeper analytics and strategic planning, and prices a single email at $200 to $400 from a small agency against $750 to $1,500 and up from a large one. A second published guide lands in the same band and adds the performance deal: InboxArmy puts small-business retainers at $1,000 to $3,000 a month and medium to large ones at $3,000 to $10,000 or more, and describes the hybrid contract as a $3,000 base plus 5 percent of revenue generated above $50,000.
Four things move a quote from one end of that spread to the other, and none of them is the agency's logo. Send volume, because a retainer is sold in emails per month and the published tiers above are separated by five emails at a time. List size, because segmentation and audience management scale with it. Who does the design, because a bespoke template built for every send is the line item that turns $200 an email into $1,500. And whether the program is being built or being run, because the setup fee covers the migration, the deliverability work and the flow build, while the retainer after it covers the calendar.
None of the ten publishes a rate card. The one public dollar figure any of them puts in front of a buyer is Barrel's contact form, which asks you to pick an annual engagement budget from bands that start under $100,000 and run to $500,000 and above. The lowest band tops out around $8,300 a month and the highest starts above $41,000 a month, so the form is a straight statement of the engagement sizes the firm is built to take.
The New York number to check any quote against is what the same work costs in-house here, and in this market the pay ranges are posted openly. Current New York listings put VaynerCommerce's Email Marketing Manager at $90,000 to $110,000, kate spade new york's Manager of Email and Lifecycle Marketing at $95,000 to $115,000, and Conde Nast's Manager of Lifecycle and Loyalty at $74,000 to $100,000. Call it $6,200 to $9,600 a month in base salary for one person who is not also a designer, not a developer and not a deliverability specialist. Lilo staffs those as separate jobs: its careers page currently lists a Senior Retention Strategist, an Email Designer and an Email Copywriter as three distinct roles. A $5,000 to $7,500 retainer is buying a slice of three or four specialists instead of all of one generalist, which is the actual trade.
My interest in this is declared. I spent a decade on the tool side and I watched every single customer waste hours dragging composer blocks doing work that AI can now do in seconds, and those hours are the billable, mechanical half of a retainer. So the question worth putting to a shortlist is not what the monthly number is. It is which of those four drivers the number is made of, and how much of that work the firm has already handed to software.
The sending platform, the paid media spend, and the developer time on the store the flows fire on. A retainer buys people and their hours. It does not buy your Klaviyo bill, which you pay directly and which scales on stored profiles rather than on how many of them you actually email.
That distinction gets expensive and it is easy to miss when two proposals look identical. Klaviyo's pricing is built on profile counts, starting with a free tier capped at 250 profiles and 500 emails a month. An agency with a 100,000-contact client pays for all 100,000 contacts even if only 30,000 are ever emailed. Nitrosend, which I co-founded and which publishes this page, prices per send with unlimited contacts, so that is my bias stated rather than hidden.
Migration is the other line that surprises people, and it is worth asking what the fee is buying. Porting a program onto an older tool used to be hours of setup and weeks of warming and optimization, a three-month job. Moving the same program onto a current platform took me five minutes. If a firm is quoting $10,000 to $25,000 to onboard you, ask which of those two jobs it is actually doing, and what it is warming.
Also outside the retainer in almost every case: the ad spend behind any acquisition work, the per-message fees on SMS, WhatsApp and RCS, the review, loyalty and identification apps several of these firms deploy, and store development itself, which on this list only Roswell and Omnycode are set up to do in-house.
Because the mechanical half of email production is the expensive half, and the firms that have automated it can put their people on the work that needs people. It is also the easiest claim to fake, which is why I have linked every AI point on this page to a named tool, a named workflow, a published result or a named person's profile. Nitrosend publishes this list, I co-founded it, and it is built for agencies running client email from an AI agent, so I am stating that interest rather than hiding it.
Klaviyo does not publish the bar, so read the badge as a signal and never as a number. The ladder on Klaviyo's own partner badges runs Silver, Gold, Platinum and Elite, and Elite is the top rung.
The reason there is no published threshold is written into the contract. Klaviyo's agency partner agreement says benefits depend on the level of the partner's participation and on certain qualifying criteria, then defers the tier requirements themselves to a Partner Program Guide that only partners receive, and reserves the right to change those criteria at Klaviyo's sole discretion. No agency can show you the scorecard it passed, because the scorecard is not public.
What Klaviyo has said in public about the top tier is qualitative. Announcing a group of Elite Master partners, Rich Gardner, Klaviyo's SVP of Global Strategic Partnerships, described the tier as partners who have made it their core mission to be an extension of the Klaviyo team, and listed what earns it: ongoing open collaboration, relevant certifications, superior client health and net promoter scores, adoption of new product lines and features, and a strong reputation in the community. Partners are nominated by their Partner Managers against quantitative criteria and then reviewed against those qualitative ones.
Two firms here hold the top tier and both put a named person behind it rather than a banner: Andriy Boychuk at Flowium is a Klaviyo Champion and Elite Master partner, and Zac Fromson at Lilo is a Klaviyo Master Elite partner and a Klaviyo Champion in 2025 and 2026. Tiers on other platforms carry the same caveat: Barrel announced in July 2026 that it had reached Shopify Platinum, the top tier of Shopify's partner program, which is a commerce credential and not an email one. One more thing worth naming, because it is the part nobody explains: the Master and Advisor words that sit beside the tier on Klaviyo's directory badges are defined neither on Klaviyo's public partners page nor in the partner agreement, so a firm calling itself Elite Master is using a label whose second half has no published meaning. A tier tells you a platform's partner team rates that firm's client health and certifications. It does not tell you the firm is right for your catalog, and it is not a price.
The mechanical half of the job moved inside the platform, where the client can now run it without the agency. In August 2026 Klaviyo shipped more than 260 new MCP tools that let an AI agent read account data, build segments, run campaigns, author flows and manage catalogs from Claude, from OpenAI or from a custom agent.
The dates are on Klaviyo's own release log. The 260-plus MCP tools landed on August 11, 2026, the analytics agent went to 365 days of data and natural-language audience analysis the same day, and Flow Analyst shipped a week earlier on August 4 with recommendations drawn from what works across 196,000 brands. Three months before that, on May 7, 2026, Klaviyo expanded its Anthropic integration so Claude can pull metric aggregates, render charts and dashboards inline, and complete multi-step jobs including weekly performance digests, flow audit reports, campaign briefs and multi-client reporting for agencies. Every one of those is a line an agency used to bill for by the hour.
The buying side changed in the same year. Barrel's CEO Lucas Ballasy posted in August 2026 that a prospect had asked him to send the proposal over for their Claude flow, and that agencies are now pitching the humans on the call and the models that support them. He made the related point about catalogs three weeks later: an AI model reading a catalog only sees fields, so an attribute that lives on the packaging and not in Shopify is simply absent when a shopper asks for it. Flowium is publishing the same shift from the email side, with Andriy Boychuk documenting a 250 percent quarter-over-quarter lift in campaign revenue for Winnie Lou off a three-phase launch framework rather than off a tool.
What that adds up to for a shortlist is simple. The manual composing grind and the constant dashboard checking are the two things going first, and any retainer still priced mostly on those hours is priced on work your own agent can now do. Pay for the judgment instead: the promotional calendar, the offer, the creative and the deliverability call. That is the half of the job that still needs a person, and on the numbers above it is the half worth $5,000 to $7,500 a month.