Free public beta until December 4, 2026:
every course is open, no card needed.
After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept.
How the beta works
bit
A single binary digit, 0 or 1.
A bit is the smallest unit of information, one of two values written 0 and 1.