SysDesignPrep.com

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interviewing.io alternative: SysDesignPrep.com vs interviewing.io

Anonymous mock interviews with engineers from top companies, for coding, system design, machine learning and behavioral rounds, plus an AI interviewer and recorded interview replays.

interviewing.io is where you practise with a real interviewer: an engineer from a company such as Meta, Google, OpenAI or Amazon runs an anonymous mock interview and gives you the feedback they would give a candidate. It covers coding, system design, machine learning and behavioral rounds, publishes recorded mock interviews shared with both sides’ permission, and has an AI interviewer for coding and system design.

A human mock is the closest thing to the real round, and worth paying for before an onsite. It is also a booked, paid session. SysDesignPrep.com is for the repetitions before it: watch a strong candidate answer a question turn by turn, then sit the same question with an AI interviewer that reads your whiteboard, at any hour, without booking anyone.

interviewing.ioSysDesignPrep.com
Who interviews youAn engineer from a top company, anonymously, or their AI interviewerAn AI interviewer that sees your whiteboard, runs the clock and asks the follow-ups
Seeing a strong answerRecorded replays of real mock interviewsA strong candidate’s interview, turn by turn, with the design drawn as they talk, plus a written reference design
Rounds coveredCoding, system design, machine learning and behavioralSystem design only
When you can practiseWhen you book a session with an interviewerAny time, without booking anyone
PriceHuman mock interviews are paid per sessionReference designs free; walkthroughs free with a Google sign-in; Pro $49 a month for the AI interviewer and Mentor

Choose interviewing.io if

  • You want a real interviewer from a top company to judge you before the onsite.
  • You are preparing coding and behavioral rounds too.
  • You want to watch real mock interviews, mistakes included.

Choose SysDesignPrep.com if

  • You need many repetitions before a human mock is worth the money.
  • You want to practise tonight without booking anyone.
  • You want each question’s reference design and deep dives to study after the round.

Many people use both: rounds here until the structure and the deep dives come without thinking, then one human mock before the onsite. The fastest way to see the difference is the free walkthrough, which needs no sign-up.

Try the free walkthroughSee all 83 questions

What we say about interviewing.io is from its own site, checked in October 2026: interviewing.io/, interviewing.io/mocks. Products change; if something here is out of date, tell us and we will fix it.

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