Best AI Mock Interview Tools in 2026: An Honest Comparison
I work on Roundz, which makes an AI mock interview, so take this list with that in mind. I've tried to be fair anyway. Most "best tools" posts are written by one of the tools, rank it first, and compare features nobody cares about the night before an interview. I'd rather tell you what each one is good at and where I'd skip it, Roundz included.
Start with the interview you actually have
The right tool depends on the round. A live coding or system design round needs follow-up questions, a code editor or design board, and a clock. A behavioral or HR round is mostly about telling stories out loud without rambling. An AI screen from an employer (a recorded video interview, or an AI that talks back) is about getting used to answering a machine with nobody nodding along. And for a final round with senior people, you want a human who has sat on the other side of the table.
The short version
| Tool | Best for | Asks follow-ups? | Human involved? |
|---|---|---|---|
| Roundz | Live technical rounds with a voice AI interviewer | Yes | No |
| Google Interview Warmup | A free first try at common questions | No | No |
| Yoodli | How you speak, and role-play scenarios | In some modes | No |
| Final Round AI | Lots of question formats in one place | Yes | No |
| Exponent | Peer practice for PM and system design | Your peer does | Yes, peers |
| interviewing.io | Anonymous practice with senior engineers | Yes | Yes, paid |
| A friend or colleague | Free, honest feedback | Yes | Yes |
1. Roundz
Roundz runs a full technical round with a voice AI interviewer. You pick the round (Data Structures & Algorithms, Low Level Design, High Level System Design, Full Stack, Data Engineering or Cloud Engineering) and your level, and then you talk it through. The interviewer asks follow-ups based on what you said, so a vague answer gets pushed and a skipped trade-off gets asked about. Coding rounds come with a code editor, design rounds with a design board, and the whole thing is timed. At the end you get a scorecard with your strengths, your growth areas and what to work on next.
Your first AI mock interview is free. Companies hiring on Roundz interview candidates with the same AI, so if you're applying to one of the open roles on Roundz, the practice round looks a lot like the real one.
The limits are real, though. It's engineering-only right now. Behavioral, sales, PM and other non-technical rounds are coming but aren't live yet. You also need a mic, speakers and a camera, so you can't do it on the bus.
Use it for a coding or system design interview where you want to feel the pressure of a real round.
2. Google Interview Warmup
This is a free tool from Google's Grow with Google program. You pick a field, answer five questions by speaking or typing, and it transcribes your answers. It points out the job-related terms you used, the words you repeated most, and your talking points.
It doesn't grade your answer or tell you what you got wrong, and it never asks a follow-up. In real interviews the follow-up is usually where things go sideways. If you've never practiced out loud before, ten minutes here is a painless way to hear yourself answer "tell me about yourself" once.
3. Yoodli
Yoodli started as an AI speaking coach and added interview role-plays. You can build a scenario from a job description, and in some modes the AI mixes follow-up questions into its preset ones. Its strength is delivery: filler words, pacing, how you come across. That makes it a better fit for behavioral rounds than for technical ones, since there's no code editor or design board.
If your content is fine but you rush, ramble or say "um" a lot, try it.
4. Final Round AI
Final Round AI covers a lot of ground: mock interviews in behavioral, technical and consulting formats, a resume builder, and a free tier for mock interviews.
A big part of the product is a "copilot" that suggests answers to you during a live interview. Many employers treat that as cheating, and you don't learn anything from it either. Use the practice side and leave the copilot alone. Third-party reviews also describe the pricing tiers as confusing, so read the plan details before you pay.
5. Exponent
Exponent is best known for product manager and system design prep. Its peer mock interviews match you with someone preparing for similar roles, and you take turns being the interviewer and the candidate. Playing interviewer teaches you a surprising amount about what interviewers look for.
Your partner is another candidate, not a hiring manager, so feedback quality varies. Sessions are scheduled, which means no practice at 11pm. For PM interviews, or if you want human practice without paying senior-engineer rates, it's a good pick.
6. interviewing.io
interviewing.io sets up anonymous mock interviews with experienced engineers from big tech companies, over voice and a shared code editor. The feedback comes from people who run real interviews at the companies you're probably targeting. It also has a free AI interviewer for self-paced practice.
The human sessions are paid per session and aren't cheap, so check their pricing page. I'd save it for when you're close to a final round at a big tech company and want a calibrated opinion.
7. A friend who has interviewed people
A colleague who has run interviews will catch things no tool will, like "you got defensive when I pushed back on your design." It costs nothing.
The trouble is that friends are polite, busy and inconsistent. Most people get one or two sessions out of a friend before it starts to feel like a favor.
How I'd combine them
For a technical interview a few weeks out, I'd do it like this:
- Do a free AI mock interview in week one to see where you stand, and note the weakest area on your scorecard.
- Spend the next two weeks on that weak area, repeating AI mock rounds until it stops showing up. Repetition is where AI practice beats everything else on this list.
- In the last week, do one or two sessions with a person: a peer, a friend, or a paid senior engineer if it's a high-stakes final.
- The day before, do one light round to warm up. Don't cram.
For a behavioral round, swap step 2 for a speaking-focused tool and run your stories out loud.
AI practice is available at midnight, lets you fail ten times without anyone watching, and shows your progress on a scorecard. People are better at nuance and at judging you against a specific company's bar. Use AI for the reps and a person for the final check.
FAQ
1. What is the best free AI mock interview tool?
It depends on the round. For a live technical round with follow-up questions and a scorecard, Roundz gives you your first AI mock interview free. For a quick warm-up on common questions, Google Interview Warmup is completely free, but it doesn't grade your answers.
2. Are AI mock interviews as good as practicing with a person?
They're better for repetition and availability. A person is better at judging soft skills and at calibrating you for a specific company. Most candidates get the most out of using both.
3. Is it cheating to use AI tools during a real interview?
Using a tool that feeds you answers during a live interview is treated as cheating by most employers and can get you disqualified. Practicing with AI before the interview is preparation, the same as practicing with a friend.
4. How many mock interviews should I do before a real interview?
Three to five full mock interviews in the same round is a reasonable target, as long as you read the feedback and work on your weakest area between sessions.
5. Can I practice non-technical interviews with AI?
Yes. Google Interview Warmup and Yoodli both cover general and behavioral questions. On Roundz, behavioral, HR, sales, marketing, product and other non-technical rounds are coming soon. The engineering rounds are live today.