You have two fractional CTO proposals open in two tabs. One is $6,000 a month, one is $12,000. Both use the words "strategy," "leadership," and "architecture." You cannot read code, so you cannot tell which person is better, and the honest fear is that you will pick on price and get it wrong. That fear is reasonable. Here is how to compare the two documents without being able to evaluate the technical skill directly.
The trick is to stop comparing the price and start comparing the shape of the engagement. A cheap proposal that is scoped to fail is more expensive than a pricier one that is scoped to work.
Compare the discovery, not the promises
The single strongest signal in a proposal is whether the person wants to look under the hood before committing to a scope.
A serious fractional CTO almost always proposes a structured discovery or assessment first, usually two to six weeks, before locking in a long-term arrangement. During it they learn your codebase, your team, your real problems, and you learn whether you can stand working with them. Be skeptical of anyone who tells you in the first call that you will need them at 50 percent time, without having seen anything. That is a quote pulled from the air, and it usually means the scope is set to whatever fills their calendar rather than what you need.
So the first comparison is not price, it is: which proposal earns its scope, and which one assumes it? The one that says "here is what I will assess in the first month, and we will right-size from there" is worth more than one that jumps straight to a big fixed retainer, even if the headline number is higher.
Compare what they are accountable for
Read both proposals with one question: at the end of a month, what has this person promised to be responsible for?
Vague proposals list activities. "Advise on architecture. Support hiring. Review vendors." Activities are not accountability. Strong proposals name outcomes and ownership. "I own that the roadmap is deliverable and that we are not building things you will throw away. I own vendor and agency oversight, including reviewing invoices and scope. I own that you can brief your board on technology in plain language." You want the second kind, because that is the difference between someone helping and someone accountable.
One specific line to look for, because it is where a fractional CTO earns their fee fastest for a non-technical founder: do they take on vetting your developers and agencies? Reviewing an agency proposal to tell you whether the scope, timeline, and price are fair, and auditing your existing code to confirm the team is not cutting corners, is often the highest-value thing they do early. If you have no engineers of your own, this matters even more, which is the whole subject of who vets your engineer when you have no engineers.
Compare the price to the right benchmark
Now the number. But benchmark it correctly.
Structured engagements from experienced US or UK fractional CTOs commonly run $2,500 to $5,000 a month at the lighter end (10 to 20 hours a week of advisory oversight), rising to $8,000 to $12,000 for senior operators handling Series A prep, complex AI products, or security-critical work. If both your proposals sit inside those bands, the price gap is telling you about seniority and scope, not about one being a rip-off.
The mistake is reading the cheaper number as the safer one. The hidden cost of an underpriced fractional CTO is real: too little seniority, too little time, and a technical foundation you pay to rebuild later. Price the proposals against the loaded cost of the full-time CTO you are avoiding, and against each other's scope, not against zero. I keep the current bands and what moves them in what a fractional CTO costs in 2026.
Compare how they communicate
You are non-technical, so their ability to translate is not a nice-to-have, it is the product. In the sales conversation, ask each of them to explain a past architecture decision in plain language. If one cannot make it understandable to you now, while they are trying to win your business, they will not make it understandable in six months when you are trying to make a real decision. The proposal itself is a sample of this: is it written for you, or is it written for another engineer?
Pick the person who leaves you feeling more informed after every interaction, not more impressed and more confused.
FAQ
The cheaper proposal is half the price. Is it ever the right call?
Yes, when the scope genuinely matches your stage. A pre-seed company that needs 0.5 to 1 day a week of oversight does not need a $12,000 engagement. The cheaper proposal is wrong only when it is cheap by underscoping the accountability you actually need. Match the fee to the scope, not to your budget anxiety.
Should the two proposals even be the same scope?
Often they are not, which is the real reason the prices differ. Before you compare numbers, normalize the scope: same hours, same ownership, same discovery. Once they describe the same engagement, the price gap usually shrinks and the decision gets clearer.
What is the single biggest red flag?
Someone quoting a large ongoing retainer before they have looked at your code, team, or problems. A good fractional CTO wants to earn the right scope through a short discovery, not assume it on day one.
I still cannot decide. What now?
Run a short paid discovery with your leading choice rather than committing to a year. If you want an outside read on the two proposals first, book a call or start with the fractional versus full-time comparison to make sure fractional is even the right shape.