Key takeaways
Interviewing.io sells the most realistic mock interview money can buy, anonymous sessions with Senior, Staff, or Principal engineers from FAANG companies, starting around $179 per its FAQ. The two reasons to want an alternative are arithmetic and scope. At $179 a rep, a month of weekly practice costs more than every subscription tool on this list combined, and the platform's interview types focus on software engineering, so everyone else needs a different tool anyway. The substitutes split cleanly: Exponent for a human without the price, Four-Leaf for unlimited voice reps at $20 a month, Interview Query for data science, and Gemini Live for free.
Quick picks
If you just want the answer.
- Best for unlimited practice volume is Four-Leaf at $20 a month or a $5 one-time 5 Day Pass. Voice mock interviews across 24 roles, plus any role you bring, with scored feedback.
- Best human-on-the-other-side substitute is Exponent, around $79 a month, whose peer matching puts a real person in the interviewer seat in both directions.
- Best for data science is Interview Query, $79 a month, with the deepest question library in the category.
- Best if you still want a few live expert sessions is Interviewing.io itself. Nothing on this list fully replaces an experienced FAANG interviewer for a senior loop, so the honest play is fewer sessions, not zero.
- Best free option is Google's Gemini Live, plus Interviewing.io's own free AI Interviewer.
Quick comparison
Pricing as of August 2026, checked on each vendor's site. Interview Query figures are from April 2026, since their plans now display only after sign-in. Confirm current plans before signing up.
| Tool | Who interviews you | Role coverage | Feedback | Price |
|---|---|---|---|---|
| Interviewing.io | FAANG engineers | SWE, system design | Written + hire signal | from $179/session |
| Four-Leaf | Voice AI | 24 roles + any you bring | Scored per answer | $5 pass / $20/mo |
| Exponent | Peers | SWE, PM, DS | Peer + rubric | around $79/mo |
| Interview Query | AI | Data science | Scored | $79/mo |
| Final Round AI | AI | Multi-role | Session reports | $150/mo ($25/mo annual) |
| Big Interview | AI | Multi-role | Rubric-based | $39 (30 days) |
| Gemini Live | Voice AI | Any, via prompt | Conversational only | Free |
What does $179 a session actually buy?
Worth being precise about, because the alternatives only make sense against it. An Interviewing.io session buys an anonymous hour with an engineer who runs real loops at a top company, written feedback, a recording, and often a hire or no-hire signal. For a senior engineer a week out from a Google onsite, that is the closest legal thing to seeing the exam early.
What it does not buy is volume, and volume is what actually moves performance. In a 2001 Journal of Applied Psychology field study of 213 promotion candidates, those who attended voluntary interview coaching scored higher, with practice methods like role-playing predicting performance beyond attendance alone. Reps compound. A candidate who can afford three sessions gets three reps. The subscription tools below price the same three weeks at $20 to $79 total for as many reps as you will actually do.
Four-Leaf
Four-Leaf is the volume play. Voice mock interviews across 24 roles, plus any role you bring, on demand. The engine asks follow-ups, scores content, structure, specificity, and clarity, and tracks whether you are improving across sessions, which a one-off human session structurally cannot. Paste a job description and the interview tailors itself to that posting.
The $20 a month subscription also covers resume tailoring, cover letters, job discovery, salary negotiation coaching, an email assistant, and a LinkedIn optimizer. Interviewing.io positions itself against resumes entirely, so if your search still involves applying places, the two products barely overlap outside the mock itself.
The limitation is that no AI matches a Staff engineer grading a senior system design answer. For that specific rep, pay Interviewing.io. The honest pairing for an engineering loop is unlimited Four-Leaf reps to build fluency, then one or two live sessions to pressure-test it.
Pricing is a $5 one-time 5 Day Pass or $20 a month with a 3-day free trial. The fit is anyone who wants the reps, and every non-engineering candidate Interviewing.io was never built for.
Exponent
Exponent keeps the thing Interviewing.io proved matters, a human on the other side, and removes the per-session price. Peer matching pairs you with another candidate and you interview each other in both directions, which sharpens you twice. Around it sit structured courses, and the PM and system design material is some of the best published anywhere.
Per Exponent's pricing page, the monthly plan runs around $79, with annual rates lower and a free tier that includes sample lessons and a limited number of peer mocks per month. That free tier is the only zero-cost option in the category where a human asks your follow-up question.
The limitation is that a peer is not a FAANG interviewer. Feedback quality varies with who you draw, and outside tech and PM the libraries thin out fast.
The fit is SWE, PM, and data science candidates who want human practice on a subscription budget.
Interview Query, Final Round AI, Big Interview, and Gemini Live
Interview Query is the pick when the loop is data science. The deepest DS question library available, SQL practice with a built-in editor, and AI mocks tuned to analytics formats. Per its April 2026 pricing, IQ Premium is $79 a month with IQ Coder at $29 for coding only. It is data science only, by design.
Final Round AI covers AI mocks with adaptive follow-ups at $150 a month billed monthly or $25 a month billed 12 months upfront, per its subscription page. Its flagship is a real-time interview copilot rather than practice, a different category with real detection risk, which we cover in our guide to AI interview copilots. Amazon banned the product from its interviews in 2025.
Big Interview is the budget structured option, $39 for a 30-day BootCamp of video courses plus AI mocks, and often free through a university career center. Check your school before paying.
Google's Gemini Live is free with a Google account and holds a real spoken conversation. No question banks, no scoring, but the right first stop for hearing yourself answer out loud, and free forever.
How we compared
We compared each tool on who sits on the other side of the mock, role coverage, feedback quality, and cost per rep. Pricing comes from each vendor's own site, checked firsthand and dated in the comparison table above. There are no affiliate links and no sponsored placements. Four-Leaf is our own product and gets the same scrutiny as every other tool here, including its limitation named plainly.
The common denominator across every option is the same. Out-loud practice is the norm among serious candidates, with a 2020 JDP survey of 2,018 Americans finding 70% practice their interview responses out loud. The tool decides the price of a rep. The reps decide the outcome.
Related reading
- Best mock interview platforms in 2026, 8 compared by price ranks the whole category, Interviewing.io included.
- Best coding interview platforms in 2026, 8 tools compared covers the typed-problem and coding-specific stack.
- Four-Leaf vs Interviewing.io is the direct two-way comparison with a full feature matrix.