The answer is a ratio, not a winner. Humans for judgment, AI for volume, roughly one human session per fifteen AI reps. A professional human mock starts at $179 a session; unlimited AI practice runs $9.99 to $25 a month across the major tools. What follows is the actual math and where each one earns its place.
Disclosure: we build DevInterview.AI, one of the AI tools discussed. Every price below was checked against vendor pages on September 1, 2026, with sources linked at the bottom.
What each option costs in 2026
- Professional human mock: interviewing.io's FAQ says interviews start at $179, with company-specific interviewers costing more; no full price list is published. IGotAnOffer sells coach sessions by credits, typically landing between $100 and $250 an hour. Marketplace platforms like Meetapro leave rates to each coach.
- Peer mock, free: Aced (formerly Exponent, home of the old Pramp) gives free accounts five peer sessions a month at fixed time slots. You interview another candidate for half the hour; they interview you for the other half.
- AI mock: DevInterview.AI runs unlimited live voice interviews at $24.99 a month or $119.99 a year, first one free. interviewing.io's own AI interviewer is free on 200+ problems. Other AI tools cluster in the same range.
The arithmetic that matters: a full year of unlimited AI interviews costs less than one hour with a professional human.
What a human uniquely gives you
Calibrated judgment. A staff engineer who runs real hiring loops reads signals no rubric fully captures: whether your seniority shows, whether you'd pass their actual bar, what a borderline performance feels like from the other chair. When the feedback is "you're ready" or "you're not," a credible human saying it lands differently, and near an onsite that calibration is worth real money. Humans also improvise like humans, because they are.
The costs are structural, not fixable: $179+ per repetition, calendars and time zones, no-shows, and a different interviewer with a different mental rubric every session, so progress across sessions is hard to measure. The supply side is fragile too: Hello Interview shut down its entire human mock program in May 2026, and interviewing.io has paused its Pay Later option.
What AI uniquely gives you
Repetition without friction, and consistency. Interviewing is a performance skill; most people need ten to twenty realistic spoken reps before nerves stop deciding outcomes, and only an unlimited on-demand format makes that affordable. A session at 11 p.m. the night anxiety spikes, the same scoring rubric every time so week-over-week change is real signal, and no half-hour spent interviewing someone else. On DevInterview.AI that means live voice interviews across coding, with executable code, system design on a canvas, and behavioral, each ending in a scored evaluation and hire verdict.
What AI does not give you is the thing the human sells: a hiring-calibrated read from someone whose judgment companies actually trust. We build one of these tools and will still say it: an AI's hire verdict is a training signal, not a hiring decision.
Where peers fit
Free, human, and mutual. Peer platforms are the right zero-budget answer and good desensitization to live human pressure. Their limits are the mirror image of their price: amateur feedback, partner lotteries, fixed slots, and half of every hour spent on the other person.
The sequence that uses each for what it is
- Weeks out: volume on AI, a rep a day, until evaluations plateau and the format is boring.
- Sprinkle peers if budget is zero or you want live human static in the signal.
- Final week: one or two professional human sessions for calibration, when their feedback can still change your prep.
Spending $179 sessions to build a skill that takes twenty reps is the one allocation that reliably wastes money, and it is the most common mistake in the market.
FAQ
Are AI mock interviews as good as human ones?
For building the skill, they are better per dollar by an order of magnitude, because reps are what build skill. For judging readiness, a senior human interviewer remains the ceiling. The strongest prep buys each for its own job.
What does a human mock interview cost in 2026?
Professional sessions start at $179 at interviewing.io per their FAQ, with company-specific and coaching options priced higher or unpublished. Coach marketplaces typically run $100 to $250 an hour.
Are there free options?
Yes, on both sides: Aced's peer mocks, five a month free, and free AI interviews, including the first full interview on DevInterview.AI with no card and interviewing.io's free AI interviewer.
How many mock interviews do I need?
Most people land between ten and twenty realistic reps before performance stabilizes. That number is the whole case for doing volume on something unlimited and saving human sessions for calibration.