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18 design-studio problems, unlimited AI reviews, all system-design questions with solutions, and full access to 87+ guide sections. Cancel anytime.

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  • 1 Design Studio problem (Deep Research Agent)
  • 5 AI review attempts
  • 3 system design questions
  • 1 applied scenario
  • 3 knowledge Q&A categories
  • Preview access to all topics
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  • All 18 Design Studio problems
  • Unlimited AI reviews
  • All 18 system design questions with solutions
  • All 5 applied scenarios
  • All 8 knowledge Q&A categories
  • Full access to 87+ guide sections
  • Architecture diagrams & Mermaid charts
  • Priority support
staff-grade content
87+
guide sections
real interview signal
18
system design challenges
AI-graded feedback
∞
reviews on premium
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Compare what you get

FeatureFreePremium
Design Studio problems1All 18
AI review attempts5Unlimited
System design questions3All 18
Applied scenarios1All 5
Knowledge Q&A categories3All 8
Guide sectionsPreviewFull access (87+)
Solutions & walkthroughsLockedAll unlocked
Architecture diagramsLimitedAll included
Priority support—✓

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