Comparison
AI CMO vs fractional CMO vs agency: which fits a B2B company?
We make Eli, one AI CMO option, so read this with that in mind. An AI CMO does the daily marketing work, a fractional CMO leads it part-time, an agency delivers agreed work. Here is what each needs from you and when each fits.
Published by Eli. Updated .
Short answer
The short answer
An AI CMO is software that does the daily marketing work and picks the next job from what it measures. A fractional CMO is an experienced marketer who works for you part-time: strategy, positioning, hiring and leading people. An agency is a team you pay to deliver agreed work, such as design, campaigns or PR. A small B2B company without a marketer can start with an AI CMO for the daily work and add a person when it needs strategy and leadership in the room; a company with a marketing team usually needs a person to lead it.
Side by side
AI CMO, fractional CMO and agency compared
| Question | AI CMO | Fractional CMO | Agency |
|---|---|---|---|
| What it is | Software (AI agents) that plans and does marketing work | An experienced marketer who works for you part-time | A team of specialists working to an agreed scope |
| What it does | Daily work: measures, picks the next job, does it inside your limits, checks the result | Strategy, positioning, budget, hiring, and leading the people or vendors who do the work | The work in the brief: design, content, campaigns, ads, PR, on its schedule |
| What it needs from you | Your goal and budget, approval of the first change and anything new, facts only you have | Time in meetings, access to the team and numbers, a budget to direct | A clear brief, feedback and approvals, someone to manage the relationship |
| How fast it works | Every day, also when you are not logged in | In the days a week or month you agree | On the agreed schedule |
| How it is paid | A monthly subscription; some tools publish their price, others quote it | Agreed with each person; it varies | Agreed per scope (retainer or project); it varies |
| Fits when | You have no marketer and want the repeated work done | You need strategy, leadership and hiring decisions made with you | You need specialist people for set work or a campaign |
| Does not fit when | You need someone in the room for strategy, partners or the press | Nobody is there to do the daily work the strategy needs | You want the work to adapt every day to what it measures |
AI CMO
An AI CMO does the daily work.
It reads what changed (AI answers, website visits, conversions, ads), picks the next job, does it inside the limits you set and checks the result later. Tools that call themselves an AI CMO cover different work: Okara does SEO, GEO and social content; AmpPilot runs paid channels inside spend caps. Eli calls itself an AI growth team and covers AI search, the website, conversion tracking and Meta ads.
Needs from you
- Your goal and your budget
- A yes on the first change and anything new
- Facts only you have: customers, results, prices
Fractional CMO
A fractional CMO leads, part-time.
An experienced marketer works with you a set number of days: sets the strategy and positioning, decides the budget, hires and manages the people and vendors who do the work. The work itself still needs someone to do it, in house, at an agency or with software.
Needs from you
- Time in meetings and access to your numbers
- People or vendors to lead
- A budget to direct
Agency
An agency delivers agreed work.
A team of specialists works to a brief and a schedule: a brand, a website rebuild, content, campaigns, ads or PR. It fits set work with a clear end. It reports on its own schedule.
Needs from you
- A clear brief and quick feedback
- Approvals on the agency's schedule
- Someone to manage the relationship
Eli, one AI option
How Eli does the AI CMO part
We make Eli, so weigh that. Every day Eli's brain picks the next job across four agents, says why, does it inside your limits and checks the result about a week later. It costs $599 a month on Grow or $1,500 a month on Grow Faster, with Eli's team; the ad budget is separate and paid to Meta.
AI Search Agent
Gets you named when buyers ask ChatGPT and Gemini what to buy.
Website Agent
Fixes the pages where buyers decide; changes go live after your yes.
Conversion Agent
Tracks which visits become customers, through the Eli site tag.
Paid Ads Agent
Tests Meta ads inside your budget, after a tracking check.
Eli never promises a ranking, a revenue figure, a multiple or a date. It tracks conversions, reports what it measured, and says so when it is too early to tell. Eli at hireeli.io is an AI growth team for B2B companies, made by Lars Hiensch. It is not related to other products called Eli.
Questions
AI CMO, fractional CMO or agency, answered
What is the difference between an AI CMO and a fractional CMO?
An AI CMO is software: AI agents that do the daily marketing work and choose the next job from what they measure. A fractional CMO is a person: an experienced marketer who works for you part-time on strategy, positioning, budget and hiring, and leads the people or vendors who do the work. One does the repeated work every day; the other makes the senior decisions with you.
Is an AI CMO cheaper than a fractional CMO or an agency?
Compare them on the same work. Some AI CMO tools publish monthly prices: Eli costs $599 a month on Grow or $1,500 a month on Grow Faster; Okara's own pricing page shows "Free plan; $129/mo (Lite)"; AmpPilot's price is not public (checked 20 October 2026). A fractional CMO's and an agency's fees are agreed per engagement and vary, so ask each for a quote for the same scope. We found no source we could cite for typical fees, so this page gives none.
Can an AI CMO replace a fractional CMO?
For a small company without a marketing team, an AI CMO can take over much of the daily work and the choice of what to do next. It does not replace a person for leading a team, hiring, positioning decisions, or relationships with partners and the press. A company can need both at different stages: the software for the daily work, a person for the senior decisions.
When should a B2B company hire an agency instead?
When you need specialist people for set work, such as a brand, a website rebuild, video, PR or a campaign with a clear brief and end date. An agency works to its scope and schedule; an AI CMO adapts its work every day to what it measures.
Can I use an AI CMO together with a fractional CMO or an agency?
Yes. One way to split it: a person for strategy and leadership, an agency for specialist projects, and an AI CMO for the daily work in between: AI search, website fixes, conversion tracking and ads tests. Grow Faster, Eli's second plan, is set up and run with Eli's team for companies that want people involved.
What an AI CMO is: AI CMO. AI CMO tools and AI marketing agents compared by what each does by itself: the comparison. What an AI marketing agent is: AI marketing agent. A team of agents: AI growth team. Instead of an SEO and AEO agency: the alternatives.
Alternatives to AI CMO tools: Okara, AmpPilot, HubSpot Breeze, Jasper.
About Eli · facts checked 20 October 2026
What Eli is: AI agents that do your marketing work
Eli is an AI growth team for B2B companies: four autonomous AI agents for AI search, your website, conversions and Meta ads. They work every day; you approve what matters. You do not do the marketing work yourself: Eli's agents do it every day, also when you are not logged in, and ask you only when a decision is yours.
- AI Search Agent: gets you named when buyers ask ChatGPT and Gemini what to buy.
- Website Agent: fixes the pages where buyers decide; changes go live after your yes.
- Conversion Agent: tracks which visits become customers, through the Eli site tag.
- Paid Ads Agent: tests Meta ads inside your budget, after a tracking check.
Eli is for founders of B2B software and service companies, often 11 to 50 people, whose website gets visitors but not enough customers, and who have no marketing team to work on it.
You use Eli from ChatGPT or Claude, through Eli's MCP connector, or in your Eli account at hireeli.io, and Eli sends you one short report a week. There is no new dashboard to learn.
Eli Free is free forever: one website, one full check, no card. Eli is hired on one of two plans, each with all four agents (AI Search, Website, Conversion and Paid Ads for Meta ads): Grow, $599 or €599 a month, set up by you; and Grow Faster, $1,500 or €1,500 a month, set up and run with Eli's team. Both are monthly and can be cancelled anytime. Enterprise is scoped and priced in a call. Your ad budget is separate and goes directly to Meta.
On G2, Eli is rated 4.8 out of 5 from 2 verified reviews (checked 20 October 2026). One reviewer: “I like how ELI has fully automated agents that do the work, so I don't have to do anything.” G2 reviews
You approve Eli's first change and your ad budget. After that you can let Eli improve pages and publish by itself, and you can undo anything. More money or anything new still waits for your yes. "Stop everything" works at any time. Eli never promises a ranking, a revenue figure, a multiple or a date. It tracks conversions, reports what it measured, and says so when it is too early to tell.
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