Guide
Fractional CTO, full-time CTO or a development agency?
Three different answers to three different problems. This is how they actually differ on cost shape, speed, ownership, incentives and continuity risk — including the cases where a fractional CTO is the wrong choice.
Side by side
| Criterion | Fractional CTO | Full-time CTO | Development agency |
|---|---|---|---|
| What you are buying | Senior technical judgement, part-time | Day-to-day technical leadership, full-time | Build capacity against a specification |
| Cost shape | Variable, scaled to cadence and scope | Fixed: salary, equity, employer costs, recruitment fee | Project or day-rate, scales with build volume |
| Time to start | Days to weeks | Typically a multi-month executive search | Weeks, subject to their pipeline |
| Ownership of the decision | Shares it: advises, decides with you, holds others to account | Owns it outright | Owns delivery of the spec, not the strategy behind it |
| Incentive alignment | No build team to keep busy, no supplier referrals | Fully aligned with the company; can become invested in own past decisions | Revenue rises with hours built, so scope tends to grow |
| Continuity risk | Deliberately temporary; knowledge must be written down | Low while they stay; high key-person risk if they leave | Concentrated in the supplier relationship and their staff turnover |
| Best when | Decisions are executive-level but the headcount is not yet justified | The technical org is large enough to need daily leadership | The what is settled and you need hands to build it |
This table reflects fifteen years of running these engagements from all three sides — as a full-time CTO and COO, as a founder of a consultancy, and as the person brought in to hold agencies to account. It is stated as experience, not as survey data.
How to choose
Which one you actually need
Choose a full-time CTO when the org needs daily leadership
Once there is a technical team big enough that someone must run it every day — hiring, line management, architecture decisions that cannot wait for a scheduled call — a fractional arrangement is the wrong shape. Say so early: hiring one late is more expensive than hiring one on time.
Choose an agency when the specification is genuinely settled
If you know what needs building, who it is for, and how you will judge it, an agency is efficient. The failure mode is using one to work out what to build, because the incentive runs towards more build, not less.
Choose a fractional CTO when the judgement gap is the problem
Not enough work for an executive salary, too much risk to leave to trust. Common triggers: an outsourced team nobody is holding to account, a roadmap the board cannot verify, an investment round putting the technology under scrutiny.
Combining them is normal
A fractional CTO holding an agency to what it promised is a common and sensible pairing. So is a fractional CTO running the hiring process for the full-time CTO who will replace them.
On cost, and what is not knowable
There is no reliable public benchmark for fractional CTO rates. The role has no standard definition, engagements vary from a two-week audit to years of weekly involvement, and the figures circulating online are marketing material rather than survey data. Anyone quoting you a single market rate is guessing.
What is knowable is the shape of the cost. A full-time appointment carries salary, equity, employer costs and a recruitment fee, and is slow to unwind if the fit is wrong. An agency cost scales with how much gets built. A fractional cost scales with how much of my time you buy, and stops when you stop.
Board-level fee data is better documented for non-executive directors than for fractional executives — the sources for that are listed on the technology NED guide .
Questions
Common questions
- What is a fractional CTO?
- An experienced chief technology officer who works with your company part-time rather than as a full-time hire. You get senior technical judgement on the decisions that carry real cost — architecture, delivery, hiring, suppliers and spend — without the salary, equity and hiring risk of an executive appointment.
- Is a fractional CTO cheaper than a full-time CTO?
- Usually, but that is the wrong way to frame it. A fractional arrangement costs less because you buy less time, not because the hourly judgement is cheaper. If the business needs full-time technical leadership, fractional is not a discount on it — it is a different thing.
- What does a fractional CTO cost?
- It depends on cadence and scope: a one-off audit and written report is a different commitment from ongoing weekly involvement. I do not publish rates, because quoting a number before understanding the work is not useful to either of us.
- Can a fractional CTO manage our development agency?
- Yes, and it is one of the most common reasons founders call. Someone independent has to read what the agency promised against what it shipped, and that person should not be paid by the volume of work built.
- How is a fractional CTO different from a non-executive director?
- A fractional CTO works inside the business, owning and shaping technical decisions. A non-executive director sits outside it, on the board, holding the executive to account and giving independent assurance. They are different roles with different legal standing.
Sources and review
This guide makes no statistical claims. The comparison is drawn from direct experience of all three arrangements, and is labelled as such above. Where a figure would normally be quoted — market rates for fractional executives — no credible published dataset exists, and this page says so rather than repeating a number from a competitor’s marketing page.
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Not sure which one you need?
Tell me what is happening and I will tell you plainly which of the three fits, even when the answer is not me.