Pro
Tradeoff Gym stays free to learn from. Pro adds the deeper practice for people who use it every day. It can't be bought yet: join the list and we'll email when it can.
Free, always
- Phases 00–03: Scale From Zero, Mental Models, Data Layer and Core Components, with their lessons and quizzes
- Pattern recall cards and compare-and-choose
- The daily question, quick quizzes and the daily workout
- Two system builds and five core drills
Pro adds
- Phases 04–11: Patterns & Principles through Senior Engineering, with their lessons and quizzes
- The 45-minute interview framework, mock interviews and the interview plan
- The estimation gym
- Work mode: apply it to your own system, postmortem practice and on-call drills
- Every other system build and drill
- The Android app, and progress synced between it and the website with GitHub
- Dark mode, or following your device's light or dark setting
- Focus mode: hide XP, levels and streaks
One-time, about $29. No subscription. Would that price work for you? Tell us below.