ByteByteGo alternative: SysDesignPrep.com vs ByteByteGo
Alex Xu’s System Design Interview books as an online course: text chapters with detailed diagrams.
ByteByteGo is the online home of Alex Xu’s System Design Interview books, some of the most read material on the subject. The chapters are text with excellent diagrams and work through the classic questions from requirements to deep dives.
It is reading material, and very good reading material. SysDesignPrep.com is where you practice saying it: a strong candidate’s interview you step through with the diagram drawn live, then an AI interviewer that probes your answer on a whiteboard it can see.
Choose ByteByteGo if
- You want the depth and diagrams of the books, and like to learn by reading.
- You also want their other courses (coding patterns, ML, and more).
Choose SysDesignPrep.com if
- You have read the books and need to rehearse out loud.
- You want an interviewer to push on your answer, not a chapter to agree with.
Many people use both: read on bytebytego.com, then practice here. The fastest way to see the difference is the free walkthrough, which needs no sign-up.
Try the free walkthroughSee all 35 questions
What we say about ByteByteGo is from its own site, checked in September 2026: bytebytego.com/. Products change; if something here is out of date, tell us and we will fix it.