The best AI interview practice tool is the one that helps you rehearse the task your interview will assess. Speaking through a behavioural example, writing code and answering a human interviewer's follow-up are different activities. You may need more than one kind of practice.
Publisher disclosure: Instant Interview publishes this guide and sells one of the products included. We benefit if you choose it. This is a researched comparison of published features, not an independent ranking or a claim that we have tested every service.
Reviewed: 10 September 2026. We checked the providers' product pages and help documentation linked below for practice format, feedback, access and limitations. We have not independently verified their outcome claims or compared scoring accuracy in controlled sessions. Features and allowances can change; check the provider before purchasing.
Quick comparison
The human and coding options are included because they can solve a preparation need that an AI voice mock does not.
| Tool | Practice format | Consider it for | Trade-off to check |
|---|---|---|---|
| Instant Interview | Live AI voice mock and session report | Spoken answers with structured content and delivery feedback | Technical practice is spoken; no shared coding editor |
| Pramp / Exponent, now Aced | Peer video mocks and AI practice | Tech and product interview practice with peers | Peer sessions are scheduled; free credits and paid features differ |
| interviewing.io | Human technical mocks and an AI interviewer | Coding and system design preparation | Choose between human coaching and the separate AI experience |
| LeetCode | Coding problems, study resources and timed assessments | Practising programming solutions | Add spoken rehearsal if explaining your solution is the difficulty |
| Big Interview | Training, recorded video feedback and voice PracticeAI | Combining a curriculum with practice | Check which features and session allowances your account includes |
| ChatGPT, Claude and Gemini | General AI chat, including voice conversations | Flexible mock roleplay and discussing answers | You set the instructions; compare feedback and account limits |
1. Instant Interview: a dedicated voice practice workflow
Instant Interview runs spoken mocks with follow-up questions and a session report covering answer content and delivery. You can add your role or job description and review areas such as STAR structure, relevance, speaking pace and filler words. The product overview explains the workflow.
Consider it when: you want to choose a practice format, answer aloud and receive a structured report without designing your own prompt. There are focused routes for NHS interviews and Civil Service interviews, alongside general formats.
Trade-offs: technical practice focuses on explaining ideas aloud; it does not replace writing and running code. AI feedback can miss context, and scores are coaching signals rather than a panel's assessment or a hiring prediction. New accounts get ten free credits, roughly ten minutes, with no card; further use depends on the paid option you choose.
Choose an online interview practice format if this matches what you need to rehearse.
2. Pramp's successor: peer practice and AI options
Pramp's homepage directs new sessions to its successor. The current practice page is branded Aced (formerly Exponent). It supports peer sessions for coding, system design, product management and behavioural interviews, as well as an on-demand AI option.
Consider it when: you want reciprocal peer practice with a shared code editor for technical questions.
Trade-offs: peer feedback depends on the person you meet. AI feedback and session allowances differ by membership, so check what your account includes.
3. interviewing.io: human and AI technical mocks
interviewing.io offers mock interviews with experienced engineers. Its published offering also includes an AI interviewer for coding and system design, with feedback after the session.
Consider it when: your priority is a technical interview and you want to choose between AI rehearsal and an experienced human's judgement.
Trade-offs: human coaching involves booking a session; check the interviewer, format and current cost against your goal. The official FAQ describes voice-only human interviews and a free AI option. These are distinct experiences, so compare the one you would actually use. We have not tested either here or verified that one provider's technical feedback is more accurate than another's.
4. LeetCode: coding practice and timed assessments
LeetCode's getting-started guidance covers coding problems and structured learning. Its official interview-preparation guide also describes timed mock assessments.
Consider it when: the task you need to improve is choosing an algorithm, implementing it correctly or solving problems within a time limit.
Trade-offs: successfully completing a coding exercise does not show whether you can explain your reasoning to an interviewer. If that is the gap, add a peer session, human mock or spoken walkthrough. Check which problems and company-specific resources require paid access before choosing a plan.
5. Big Interview: training, video feedback and voice PracticeAI
Big Interview's simulator page describes training resources, AI feedback on recorded answers and voice-based PracticeAI. Its PracticeAI documentation explains how a job description and optional resume inform audio questions and feedback.
Consider it when: you want guided learning alongside interview practice, or you already have access through a university or careers service.
Trade-offs: check your account's PracticeAI allowance and the features included in your access. The help centre says session availability can depend on the account. Decide whether you need a course, recorded-video review or voice practice, then inspect that particular workflow before paying.
6. ChatGPT, Claude and Gemini: general AI with voice
You can practise speaking with general AI assistants. OpenAI documents spoken conversations in ChatGPT, Anthropic documents Claude voice mode, and Google documents Gemini Live. Device support, availability and limits vary.
Consider them when: you already use an assistant and want flexible roleplay, questions based on a job description or a discussion of your answer. For example, ask it to interview you for a role, wait for each answer and ask a relevant follow-up before giving feedback.
Trade-offs: you decide the instructions and what to review. Compare the actual feedback with your interview requirements rather than assuming a general assistant is always worse, or that a dedicated product's score is inherently more trustworthy. Specialist tools may offer a more convenient session setup and report. Try both on the same practice goal to decide whether that convenience is worth paying for.
How to choose for your next interview
- A behavioural or competency interview: rehearse an example aloud, then check whether the feedback identifies missing evidence and helps you improve it. An AI assistant, dedicated platform or knowledgeable person can help.
- Coding plus behavioural rounds: practise writing code as well as explaining decisions. One format rarely covers both tasks fully.
- An NHS or Civil Service interview: start with the role's job description, person specification and assessment guidance. Check that the practice reflects the relevant role, values or grade rather than relying on a generic label.
- A need for human judgement: consider a peer, careers adviser or experienced interviewer, particularly when AI feedback seems unclear or inconsistent.
- A limited budget: use available free practice first. An existing university or careers-service subscription may cover what you need.
What useful feedback should help you do
A score is useful only if you understand what to change. After a short session, ask:
- Did the questions fit the role and format?
- Did the feedback refer accurately to what I said?
- Did it identify something specific I could improve?
- Could I put that advice into a better second answer?
For example, “add the outcome and explain your own contribution” is an actionable next step. A high confidence rating by itself tells you much less. This is a way to evaluate a tool, not evidence that any provider's scores predict interview success.
Try a short practice session
If you want to evaluate Instant Interview, browse the practice formats or try a three-minute behavioural mock. Signup includes roughly ten free minutes and requires no card. Use the report to decide whether further practice would help you; current pricing is available here.
