SysDesignPrep.com

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Codemia alternative: SysDesignPrep.com vs Codemia

A practice platform: 120+ system design problems you design on a whiteboard and submit for AI evaluation, with editorial solutions, peer mock interviews, and coding and object-oriented design practice.

Codemia starts from the same belief as this site: reading about system design is not enough, you have to practise. It has a large problem set (120+ system design problems, plus object-oriented design, ML system design, agentic AI design and 300+ coding problems), a whiteboard to design on, AI evaluation you can revise against and resubmit, editorial solutions, and peer mock interviews with other engineers.

The difference is the shape of the practice. On Codemia you write and draw a design, submit it, and get feedback on the result. SysDesignPrep.com practises the conversation: an AI interviewer asks one thing at a time, follows up on what you said and drew, and runs the clock. Before you sit a question, you can watch a strong candidate answer it turn by turn.

CodemiaSysDesignPrep.com
How you practise a questionDesign on a whiteboard, submit it for AI feedback, revise and resubmitAn AI interviewer runs the round: one question at a time, follow-ups on what you say and draw, a scored debrief
Seeing a strong answerEditorial solutions and other users’ submissionsA strong candidate’s interview, turn by turn, with the design drawn as they talk, plus a written reference design
Mock interviewsLive peer mock interviews with other engineersAI mock interviews at any hour, timed or with the AI Mentor beside you
Breadth120+ system design problems, plus object-oriented design, ML system design and codingSystem design only: 83 questions, each with a full walkthrough, a reference design and deep dives
PriceMonthly and annual plans, listed at $79 a month or $159 a year and often discounted; some problems freeReference designs free; walkthroughs free with a Google sign-in; Pro $49 a month for the AI interviewer and Mentor

Choose Codemia if

  • You want the largest set of system design problems to work through.
  • You also want coding, object-oriented design or ML system design practice in one subscription.
  • You prefer to design in writing at your own pace and get feedback on the finished design.

Choose SysDesignPrep.com if

  • Your interviews go wrong in the conversation: the follow-up you did not expect, the clock, the order.
  • You want to see how a strong candidate paces the hour before you try it.
  • You want an interviewer that asks back, not a grader that scores a finished design.

Many people use both: a large problem set to cover breadth, then full rounds here to rehearse the conversation. 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 Codemia is from its own site, checked in October 2026: codemia.io/, codemia.io/pricing. Products change; if something here is out of date, tell us and we will fix it.

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