The full comparison.
| // dimension | Harvey / CoCounsel | Full-time CTO hire | Generalist tech consulting firm | Knight CTO |
|---|---|---|---|---|
| where data lives | Vendor cloud servers | Your infrastructure | Often vendor-recommended SaaS | Your machine, on-device |
| ABA Rule 1.6 posture | Vendor processes privileged data under DPA | Internal control | Architectural decisions deferred to vendor | Architecture-level safe |
| annual cost (10-attorney firm) | $144K–$288K ($1.2K/user/mo for Harvey) | $280K–$500K+ base + equity | $100K–$250K + retainers | $10K–$130K depending on tier |
| time to first value | 3–6 months onboarding + training | 3–6 months recruiting + 3 months ramp | 2–4 months scoping + slide decks | 6 weeks (fixed scope, weekly demos) |
| scope | AI features only | Full CTO function | Full tech function (generalist) | Full CTO function (legal-specialized) |
| vendor independence | Locked to their platform | Internal hire — yours | Often have referral / partnership programs | No referral fees, ever |
| exit cost | Lose all data & workflows + retraining | Severance + 3–6 month replacement search | Vendor lock-in + transition cost | Month-to-month, you own everything |
| who does the work | Account manager + support tier | Your CTO + their team | Senior partner pitches, juniors deliver | Boris, personally |
| depth of legal-industry knowledge | Built for legal | Depends on the hire | Generalist, learns on your dime | Legal industry exclusively |
| contract length | 12-month minimum, often 36-month | Indefinite employment | 12-month minimum typical | Month-to-month after first quarter |
When the SaaS legal-AI vendor is the right answer.
If you're an AmLaw 100 firm with 200+ attorneys and a dedicated Legal Operations team that already handles SaaS procurement, vendor diligence, and security review at scale: Harvey at $1,200+/user/mo is a rounding error if it produces a 10% efficiency gain across 200 lawyers. The unit economics work. Your in-house team can absorb the ABA 1.6 review work, and you have insurance posture that covers the residual risk.
If you have a single use case where one of these tools is best-in-class (Spellbook for transactional contract drafting, Casetext for case-law research before the Thomson Reuters acquisition) and your matters in that area don't involve highly sensitive data: a focused SaaS subscription is fine.
Where the SaaS path breaks down: any matter involving sealed records, attorney-eyes-only material, classified information, regulated industries with their own data restrictions, or clients who have AI restrictions in their outside counsel guidelines (which is now ~40% of large corporate clients). For those matters, you need a path that doesn't ship the data to a vendor cloud at all.
When you should hire a full-time CTO instead.
If you're a 100+ attorney firm with a managing partner who treats technology as a competitive advantage (not a cost center), with a budget that can support a $400K+/year senior tech executive plus their team: the full-time hire is correct. The strategic value of having a senior technologist in every leadership meeting compounds over years. Knight CTO is not a substitute at that scale.
If you're undertaking a major multi-year transformation (full DMS migration, M&A integration, IPO prep, building a tech subsidiary): the day-to-day intensity of that work needs an embedded operator with daily presence. A fractional engagement loses too much to context-switching.
Where the full-time hire breaks down: 90% of US law firms are under 50 attorneys, and the math does not work at that size. A $400K hire is 1–2% of total firm revenue at a 30-attorney firm — and the work that justifies that hire is roughly 8 days per month. The fractional model exists because the math is honest.
When you should hire a generalist consulting firm instead.
If you have a non-legal-specific tech project (e-commerce platform, HR system, marketing tech stack) where the legal-industry specialization isn't relevant: a generalist tech consultancy at the right size is going to do that work fine. Don't pay a premium for legal-industry expertise if your problem isn't legal-industry-specific.
If you need a team of 10+ engineers for a long build: a real consulting firm has bench depth that a solo operator does not. Knight CTO works alone by design — that's the value proposition (no juniors, no handoffs) and also the constraint (one person's bandwidth).
Where the generalist firm breaks down: ABA Rule 1.6 / Rule 5.3 understanding usually isn't there. Vendor recommendations are colored by referral relationships you can't see. Senior partner pitches the work, juniors deliver it. The "engagement letter" is 40 pages of caveat. Pricing is "time and materials" because they refuse to commit to scope. None of that is necessarily bad — but for a law firm that wants the architecture to actually preserve privilege, it's a different product.
When you should engage me.
You're a law firm of 5–75 attorneys. Big enough that tech matters; small enough that hiring a full-time CTO is overkill.
You want AI but the SaaS path is wrong for the matters you handle. Family law, criminal defense, healthcare, government contracts, M&A war rooms, sealed records — anything where shipping the data to a vendor server is the wrong answer.
You want vendor diligence from someone who has no financial interest in which vendor you pick. No referral fees, no kickbacks, no partnership programs. The independence is the product.
You want the senior person to actually do the work. No juniors. No agency layer. If we engage, you have my mobile number and a working system within 30 days.
You want to start small. The Diagnostic at $1,500 is a real proof point. If I'm not the right fit, you walk away with a useful written report and we both move on.
When you don't need any of this yet.
If you're a solo practitioner billing under $500K, with no associates, no full-time staff, no compliance obligations beyond the standard rules, and your existing tech (Clio + Office 365 + a decent laptop) is keeping the practice running: do not buy any of this. Not Harvey. Not a fractional CTO. Not Knight Legal AI. Spend $20/month on Claude Pro, learn what AI can and can't do for you, and revisit this question in twelve months when the firm has grown into the problem.
The honest answer to "do I need a CTO" is "probably not yet" for most solo practices and very small partnerships. If that's you, take what's useful from the free resources page, adopt the policy template, and call me when the firm is bigger.
I'd rather lose this engagement than sign one where I'm the wrong fit. The Diagnostic ($1,500) is structured exactly so we can find that out without either of us committing to a year.