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

converse

Swapping the two pieces of a conditional -- $q\implies p$ from $p\implies q$ .

The converse of $p\implies q$ is $q\implies p$ -- not guaranteed to have the same truth value as the original.