Both give you real interview practice. They differ on anonymity, price per session, and whether the loop you are preparing for includes a machine coding round.
| Dimension | interviewing.io | InstaMock |
|---|---|---|
| Unlimited practice | Sessions are booked and paid individually | AI interviewer gives unlimited reps between expert sessions |
| Expert sessions | Core product - anonymous engineer interviews | Booked 1:1 sessions with named FAANG interviewers |
| Machine coding / LLD rounds | Limited coverage - US loops rarely include them | First-class: dedicated LLD and machine coding practice |
| Time zones | Interviewer pool weighted to US hours | IST slots with India-based interviewers |
| Structured curriculum | Practice-led | DSA, LLD and system design tracks alongside interviews |
You are targeting US big tech, you want anonymity, and per-session cost is not the constraint.
You want high-volume practice between expert sessions, you are preparing for Indian product company loops with machine coding and LLD rounds, or you need IST slots.
For the live expert interview itself, the offerings overlap - both put you in front of an experienced engineer who gives structured feedback. The difference is what surrounds it: InstaMock pairs that with an AI interviewer for unlimited practice and covers machine coding and LLD rounds that US-centric platforms rarely test.
It depends on volume. If you want a handful of high-signal sessions, paying per session is reasonable. If you want daily practice with periodic expert validation, unlimited AI practice plus occasional 1:1 sessions works out cheaper per rep.
No, and many candidates do not. Using unlimited AI practice to build fluency and booking expert sessions - on either platform - to calibrate readiness is a reasonable strategy.
Five free mock interviews, no credit card. Compare the feedback yourself.