Six interactive 30-day courses — one for each great thinking system. Lessons, drills, quizzes, and spaced repetition, built for real decisions. Register once; your progress follows you on every course and every device.
The Great Mental Models Vol 1, built as a dojo · coached by Claude · progress syncs via your account per-course export/import also lives on each course site’s own page
Your account
One account syncs your progress on every course, on every device.