Both are AI mock interview tools and both have a free tier. The real question is breadth or depth: they cover 133+ job profiles, we cover software engineering rounds in detail.
| Dimension | FreeMockInterview | InstaMock |
|---|---|---|
| Scope | 133+ job profiles across many careers | Software engineering interviews only, in depth |
| Coding rounds | Interview practice and feedback | Real code execution against test cases across 670 DSA problems |
| System design (HLD) | Not a stated focus | Dedicated HLD rounds with 20+ designs and scored feedback |
| LLD / machine coding | Not a stated focus | First-class: 19 LLD problems plus machine coding practice |
| Live 1:1 sessions | AI practice | AI practice plus booked sessions with named interviewers |
| Market focus | General, en-US | Indian product company loops and IST slots alongside global ones |
You are interviewing outside software engineering, or you want quick spoken practice for behavioural and HR rounds across a range of roles.
You are an engineer or engineering student preparing for technical rounds, and you need code that actually runs, system design and LLD practice, and the option of a real interviewer.
AI mock interviews here are free to practise - System Design, LLD, DSA and behavioural rounds - as is the DSA problem set, with no credit card required. FreeMockInterview is free throughout too, so on cost alone there is little between them. What the paid plans here buy is booked 1:1 sessions with human interviewers, which is a different product rather than a higher tier of the same one.
If your rounds are DSA, technical interviews and design - which is what engineering campus drives and product company loops test - the depth here is the point: problems that execute against test cases, dedicated LLD rounds, and aptitude practice for the first filter. For HR and behavioural rehearsal across many role types, their breadth is genuinely useful.
No, and there is no strong reason to. They are free, so using them for spoken behavioural practice while doing technical rounds here costs nothing. The two tools barely overlap in what they are good at.
Free AI mock interviews, no credit card. Compare the feedback yourself.