A founder I spoke with last fall had done what you are supposed to do. She asked her network, got three referrals, and talked to three providers. All three called themselves fractional CMOs. One worked independently, two or three clients at a time. One was a boutique agency with a branded methodology and a team behind the person she would meet. The third was a talent platform that would match her with someone from their network. Same label. Three different products.
She had no way to know that going in, because the terminology does not tell you.
LinkedIn profiles mentioning fractional roles grew from 2,000 in 2022 to over 110,000 by early 2024. Demand for fractional executives grew 46% year-over-year in a 2024 Harvard Business Review survey. The label has become crowded with providers whose models are genuinely different from each other. Understanding that difference is not about vocabulary. It is about knowing what you are buying.
Fractional CMO, part-time CMO, outsourced CMO: mostly the same
The terms "fractional CMO," "part-time CMO," and "outsourced CMO" are used interchangeably by most providers. The distinction is vocabulary, not model. All three describe a senior marketing executive working with your company on a part-time basis, typically two to four days per week, personally accountable for pipeline outcomes. They are in your leadership meetings. They own a number. They report against it.
CMOx, one of the larger operators in this space, explicitly defines outsourced CMO and fractional CMO as equivalent on their site. Most solo practitioners do the same. If you search for any of these three terms and land on a provider's page, you are almost certainly looking at the same engagement structure described with a different word.
Where it gets complicated is when "outsourced CMO" is used to describe an agency arrangement. In that version, you are engaging a firm rather than a person. You get the firm's methodology, a CMO-level account lead, and a team executing below them. The accountability structure is different: the firm is accountable for deliverables, not a specific person accountable to your pipeline number. That is a genuinely different product, and it matters.
CMO-as-a-service is different
This is where the real distinction lives, and it is not obvious from the name.
CMO-as-a-service typically describes an execution-led model: a cross-functional team covering content, design, paid media, and marketing operations, organized under a single commercial relationship. The CMO-level person leads strategy and directs the team. Kalungi, for example, prices their full-service offering at $15,000 to $30,000 per month specifically because the cost includes the execution team, not just the CMO. You are buying an outsourced marketing department.
This is not a worse product. For companies past $5M ARR that have a defined GTM motion and need scale in execution alongside strategic direction, it may be exactly right. But it is structurally different from hiring a single embedded operator who is present in your leadership meetings, working with a small number of clients at once, and personally accountable to your pipeline number. Comparing quotes across these two models without understanding the structure is how founders end up with something they did not expect.
The diagnostic question is not which label the vendor uses. It is what they personally own when the strategy is not working.
The one question that cuts through all of it
"If the numbers are not moving after ninety days, what changes?"
If the answer is "we would revisit the strategy together" or "we would adjust the deliverables," that is an advisory or agency model. If the answer is "I change the strategy and take personal accountability for the result," that is an embedded executive model. The label does not determine this. The answer does.
A follow-on worth asking: "How many clients are you currently working with?" An embedded operator who takes the accountability seriously runs a small book. Two or three companies at a time. That constraint is not a positioning line. It is the only way to give each company the depth of attention that actually moves outcomes. A provider with ten or fifteen active clients is structurally delivering something different regardless of the label they use.
Which model fits which situation
Also called: fractional CMO, part-time CMO, outsourced CMO
Best fit: the gap is strategic direction. You need someone in the leadership seat owning the GTM motion, not a team executing on a strategy that already exists.
Typical cost: $3,000 to $15,000 per month depending on days per week, scope, and seniority.
Also called: CMO-as-a-service, outsourced CMO (sometimes), full-service fractional
Best fit: you need both strategic direction and execution capacity. You are buying a team, not a person. Better suited to companies past $5M ARR with a defined motion that needs scale.
Typical cost: $15,000 to $30,000 per month including execution team.
Also called: fractional CMO via platform (MarketerHire, GrowTal, GTM 8020)
Best fit: speed and optionality. You have a clear brief, need someone quickly, and are comfortable managing the relationship directly after placement. The platform's accountability ends at the introduction.
Typical cost: varies by operator, usually disclosed after matching.
If you are already in the wrong engagement
If you are reading this because you are three months into an arrangement that is not producing what you expected, the pattern is usually one of two things. Either the engagement is advisory work presenting as embedded leadership: strategy documents and quarterly check-ins rather than someone in the room owning a number. Or there is a clear strategic gap that the execution team below the CMO cannot compensate for because nobody above them is setting direction.
Both are fixable. Naming which one you are dealing with changes the next conversation you have with your current provider. It also changes what you look for if you decide to make a change.
The next time you see a site using "outsourced CMO," "part-time CMO," or "fractional CMO," ignore the label. Read what they say about accountability. Count how many clients they take. Find out whether you are engaging the person in your meetings or the firm they represent. Find out what changes if your pipeline does not move in ninety days.
That is the question. The word they use to describe themselves is not.
If you want to understand specifically how the embedded model works at bergerCMO.ai, including what the first thirty days look like and what metrics get agreed on before day one, a thirty-minute call produces a clear answer on whether this fits your situation. Start that conversation here.