Pick a fractional CMO when you are missing marketing leadership and already have people to execute. Pick a demand gen agency when you have a channel that works and need specialists to run it. Pick a done-for-you GTM service, such as Blesso, when nobody on your team can run outbound, content and AI search, and the founder is the bottleneck.
Key takeaways
- The three models sell different things: a fractional CMO sells leadership hours, an agency sells a channel program, a done-for-you service sells the motion.
- A fractional CMO typically costs $7,600 to $12,000 a month at 15 hours a week, and that retainer rarely includes anyone to do the work.
- Our estimate puts a CMO plus a one-channel agency near $15,300 a month before ad spend. Blesso starts at $2,000 a month, for a different scope.
- Ask three questions of every model: who executes, who owns the number, and how a meeting is counted.
- Blesso's published results all come from hiring and staffing companies. Treat them as a pattern in one vertical, not a promise.
The three models sell three different things
Most comparisons rank these options on price. The better test is the job each one does. A B2B SaaS team is usually missing one of three things: someone to decide, someone to run a channel, or someone to run the whole motion.
| Model | What you buy | Who does the work | Typical price |
|---|---|---|---|
| Fractional CMO | Senior marketing leadership by the hour | Your team, freelancers or agencies they direct | $7,600 to $12,000 a month at about 15 hours a week |
| Demand gen agency | A program in one or more channels | The agency's specialists | From about $5,000 a month for one paid channel; $14,000 to $26,000 and up for fuller service. Media spend is extra. |
| Done-for-you GTM service | The motion, run end to end on a retainer | The provider's operators and platform | Blesso: from $2,000 a month, three-month minimum |
Prices come from public market sources. The fractional CMO range uses a benchmark of $128 to $200 an hour at 15 hours a week. The agency figures come from a 2026 review of published agency prices, which found fees from about $5,000 a month for one paid channel up to $26,000 a month for a full demand service, with media spend on top. Your quote will differ.
What a fractional CMO does well, and what it leaves undone
A fractional CMO is a senior marketer who works part time. They set positioning, pick channels, hire and manage people, and report to the founder. This is the right model when the problem is direction.
The gap is execution. A typical engagement covers strategy, vendor selection and executive reporting. Hands-on work such as writing, list building, sending and reply handling is not in the retainer. One agency's cost guide calls this the most common complaint from fractional CMO clients: strategy with nobody to carry it out. That guide sells execution, so read the claim as a vendor view. The structure it describes is still plain. About 15 hours a week of one person cannot also run three channels.
A fractional CMO fits when:
- You have marketers or freelancers who need direction.
- Positioning, pricing or the buyer is still unsettled.
- You plan to hire a full-time marketing leader and want help to recruit one.
What a demand gen agency does well, and where it stops
A demand gen agency runs a program. Typical scope is paid media, search, content or account-based campaigns, with reporting on pipeline. Specialists make it strong at a channel that already works.
Three things to check before you sign:
- Media spend. Agency fees are usually scoped to your ad budget, and the budget is paid on top of the fee.
- Fee structure. A percentage of spend pays the agency more when you spend more, whether or not pipeline follows. A flat retainer avoids that conflict.
- Terms. The same review found minimums of three to six months on main services. Put the term that applies in the contract.
An agency fits when you already know which channel works, you have budget running, and you have someone in-house to own the strategy and judge the results. Without that person, you buy activity nobody connects to your plan.
What a done-for-you GTM service does, and what it is not
A done-for-you GTM service runs the motion on your behalf. Blesso is one. It is a productised B2B go-to-market service sold as a monthly retainer. It is not software you run, and it is not a staffing firm.
Blesso runs three service lines:
- Outbound Engine: thirteen jobs between a target market and a booked call, including sourcing, scoring, enrichment, email and LinkedIn on one sequence, and reply handling.
- Inbound Engine: ten jobs run as one system, from offers and funnels to content shipped every day.
- AEO / GEO: buyer prompts mapped and tracked across ChatGPT, Perplexity and Gemini, then earned through answer-ready pages.
The distinct part is accountability. Blesso reports every week in three tiers, always in the same order: activity it controls, market response, and business outcomes. It says that if activity slips, that is an operator failure. A no-show counts against the monthly meeting target. Meetings are counted from your calendar, not Blesso's dashboard. If the target is missed twice, Blesso changes the approach, with more channels or different signals, not a lower target. Read the full rules on how the work is counted.
There are limits. The retainer carries a three-month minimum, then 30 days' notice. You hand over execution, so you give up some hands-on control. And Blesso runs the motion; it is not a leadership seat. If you need a person to own hiring, brand and the board narrative, that is the fractional CMO's job.
Worked estimate: what each stack costs per month
Here is a labeled estimate, not a measured result. It shows why a fractional CMO alone rarely closes the gap. Assumptions: a CMO at the average benchmark rate of $173 an hour and 15 hours a week, and a one-channel agency at the low published end of $5,000 a month.
| Stack | Calculation | Monthly, before ad spend |
|---|---|---|
| Fractional CMO alone | 15 hours × 4 weeks × $173 | $10,380, about $10,300 as the benchmark rounds it |
| Fractional CMO plus one-channel agency | $10,300 + $5,000 | $15,300 |
| Done-for-you GTM service | Published floor | From $2,000, three-month minimum |
Do not read the last row as a like-for-like saving. The CMO supplies leadership across all of marketing. The $2,000 floor buys Blesso execution, and the price for your scope comes from a call. Blesso publishes only the floor, not tier prices. The point is that a strategy retainer and an execution retainer are two purchases, and a done-for-you service is one.
How to choose: match the model to the job you are missing
| Your situation | Best fit |
|---|---|
| You have a team and budget, but no direction or marketing leader | Fractional CMO |
| One channel works, you have ad budget, and someone in-house owns the plan | Demand gen agency |
| No GTM team, the founder still prospects, and outbound, content and AI search all need running | Done-for-you GTM |
| You are weighing a first SDR hire against another option | Done-for-you GTM, or an in-house hire |
| Positioning is unsettled and you also need execution | Fractional CMO first, then add execution |
The models also combine. A fractional CMO can direct a done-for-you service in the same way they direct an agency. The question is where the weak spot is.
The evidence Blesso can show, and how far it goes
Blesso publishes three customer results. They are per-customer results, not averages, and no baselines are published.
- HappierHire, an AI hiring platform, shelved an SDR hiring plan and reports 3.1x pipeline in one quarter from outbound and reply handling.
- Airbills, an offshore staffing firm, moved its founder out of prospecting and reports $1.4M in pipeline in 90 days.
- Oorwin, a talent intelligence company, ran outbound and founder-brand content on one system and reports 180+ qualified meetings in six months.
All three sit in hiring, talent and staffing. That is a pattern in one vertical, not proof across industries. The case studies have the detail. We have no comparable published results for fractional CMOs or agencies, and we make no claim about how any specific provider performs.
Five questions to ask before you sign any of them
- Who does the work, by name and by role?
- Who owns the number: tasks, meetings or pipeline?
- How is a meeting counted? Held or only booked, and from whose calendar?
- What happens if the target is missed twice?
- Who owns the account list, the content and the accounts when you leave?
A provider that cannot answer questions two and three plainly is selling activity. The same questions work on all three models.
FAQ
Is a fractional CMO the same as a demand gen agency?
No. A fractional CMO sells senior leadership hours, typically about 15 hours a week. A demand gen agency sells a program run by its own specialists. The CMO decides what to do. The agency does the work in a channel.
Can I use a fractional CMO and a done-for-you service together?
Yes. The CMO sets positioning and direction, and the service runs execution. This works well when the CMO would otherwise have to find and manage several vendors.
How much does a fractional CMO cost for B2B SaaS?
One 2026 benchmark puts a typical engagement at $7,600 to $12,000 a month, based on 15 hours a week at $128 to $200 an hour. Other published guides give wider ranges, from about $5,000 to $20,000 a month depending on stage and scope.
What does Blesso cost?
Blesso engagements start at $2,000 a month with a three-month minimum, then run monthly with 30 days' notice. Blesso publishes only the floor. The price for your scope comes from a call.
Is Blesso software or an agency?
Neither. Blesso is a done-for-you B2B go-to-market service sold as a monthly retainer. Its platform is included in the service and is not sold separately.
Decide which job you are missing first: leadership, a channel or the motion. If it is the motion, book a call to see what Blesso would run for you, or read the three service lines first.