Cardinal helps you remember the best parts of what you read, watch, and hear — without changing how you learn.
You binge podcasts, stack up saved videos, highlight books.
But most of it fades by next week."
Cardinal adds a memory layer to your content diet — so the good stuff actually stays with you.
Each Cardinal deck is built from a specific podcast episode, YouTube video, or piece of content — so you can actually keep the parts that stuck with you.
Why time slows down in crisis, and how brains process urgency.
14 cards
On entropy, repair, and the laws of physics that doom your favorite objects.
10 cards
Protocols, supplements, and circadian hacks that actually work.
18 cards
Cardinal uses the same spaced repetition technique trusted by Anki, SuperMemo, and high-performance learners worldwide.
It's designed to beat the forgetting curve and lock in what matters most.
Have a favorite podcast or video? Bring it with you.