System Design Prep
Terms
System Design Prep is a browser-based interview practice workspace covering requirements, capacity, APIs, data models, caching, queues, consistency, observability, reliability, security, and tradeoff narratives. All roadmap content is free; free users see ads. Premium removes ads only and does not lock any content.
Plans: Monthly ₹199 / $3.99, Six-month ₹799 / $15.99, Yearly ₹1499 / $29.99. Sign-in with Google or an email link is required to start or restore Premium.
For product issues, policy questions, or website feedback, use trei.dev/feedback or email contact.gangwar@gmail.com.