I priced every AI mock interview tool so you don't have to
interviewing.io, Final Round AI, Exponent, Yoodli — what each one actually costs, what it's actually for, and where our own tool loses. No invented ratings, no "trusted by" numbers.
I spent an evening doing something most candidates do before they've answered a single practice question: comparing tools. Six tabs open, six pricing pages, six sets of vague claims about "AI-powered feedback."
Here is what I actually found — prices, what each tool is really for, and where it beats what I'm building. I run Prepair, so treat that as the bias it is. I've tried to write the section about my own product with the same honesty as the others, including the part where it loses.
interviewing.io — a real senior engineer, on video, for a real price
This is the only tool on this list that gives you an actual human interviewer, live, judging you the way a real interview panel would. That's not a small thing — a person notices hesitation, follow-up gaps, and the difference between "I know the definition" and "I've actually built this," in a way no scoring model does yet.
It costs accordingly. A standard session runs from $179, and sessions with interviewers from a specific target company go up to $225–$339. Dedicated coaching packages run $1,500–$4,000. There's a "pay later" option that defers the bill until you're employed, and new users get one free peer session on signup, plus more free sessions if you interview other people in return.
Use it if you have one interview loop that actually matters and a budget for it — a FAANG onsite two weeks out, for instance. Don't use it as your only practice for the first fifty questions; at that price, that's not what it's for.
Final Round AI — practice mocks that are solid, a live copilot that isn't
Final Round AI is really two products wearing one name. The mock interview side — upload your resume and a job description, get role-specific questions and scored feedback on clarity and communication — is genuinely well reviewed and does what it says.
The live copilot side listens during your actual interview and feeds you suggested answers in real time. This is the part I'd be careful with. I've spent ten years on the hiring side of the table, and a copilot doesn't fail the way people assume — it isn't caught, it's noticed. The pause before every answer becomes the same length regardless of difficulty. The first answer is polished and the follow-up is thinner, when in an honest answer it's usually the reverse. Interviewers rarely write "used AI" in their notes; they write "seemed to know the theory but I couldn't get to what he'd actually done," and that's the one that kills an offer without ever explaining why.
Pricing is confusing across their own materials — I found $25/month billed annually, $60/month quarterly, $90/month monthly on one page, and $49.67 / $99.67 / $149 on another, for what reads as the same tiers. Worth double-checking on their site before you commit rather than trusting either number here.
Exponent (formerly Pramp) — broad content, and the free tier is real
Exponent absorbed Pramp in 2024, so if you remember Pramp's free peer-to-peer mocks, that's now folded into Exponent's platform. The free plan still exists — 5 peer mock credits a month, sample lessons, no card required.
Paid tiers: $79/month with no contract, or $12/month billed annually (~$144/year, described as a 70%-off annual rate — Exponent runs frequent promo codes, so check before paying the listed price). A Pro add-on for premium content and expert sessions runs $50 per 500 credits, and one-on-one coaching with ex-FAANG engineers starts around $200/hour.
This is the broadest tool on the list — courses, question banks, peer mocks, expert coaching — and that's both its strength and its limit. It's built for someone assembling a full prep curriculum, not for someone who wants to answer one question right now and see what's wrong with the answer.
Yoodli — the cheapest real option, and it's not really for technical interviews
Yoodli started as a general speech-coaching tool and extended into interview prep. It's the cheapest paid option here by a wide margin: free for 5 lifetime roleplays, $8/month (billed annually) for 10 roleplays a week, $20/month for unlimited plus a data opt-out.
What it's actually scoring is delivery — pacing, filler words, eye contact — not whether your answer to a system-design question was technically sound. If your gap is "I ramble when I'm nervous," it's a good, cheap fix. If your gap is "I don't actually know the difference between optimistic and pessimistic locking," it won't tell you.
Where Prepair fits, and where it doesn't
What I built: pick a role and a seniority level, answer a real technical question, get scored on the actual content of your answer against what that level should know — free, no signup, three interviews a month on the free tier, $9 and $19 for more.
Here's where it loses to the tools above, plainly:
No live human. interviewing.io gives you a real interviewer noticing real hesitation. I don't have an answer for that gap — a rubric-scored AI answer, however careful, is not the same signal as a person who's run a hundred of these.
No speech or delivery coaching. If your problem is nerves, pacing, or filler words rather than technical content, Yoodli is built for exactly that and I'm not.
Narrower than a full curriculum. Exponent is a whole prep program — courses, community, coaching. Prepair does one thing: a question, an answer, a scored breakdown of what was missing. If you want structured lessons alongside practice, that's not what this is.
What it's for: someone who wants to answer a real question right now, see exactly which part of the answer was thin, and do that again for free before they decide whether to pay for anything at all — including the tools above.
If you want to see the whole comparison for yourself, the free demo doesn't ask for an email first — pick a role, answer one question, see the score.