You're already learning. Let's make it stick.

    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.

    Built for curious minds

    who still give a shit.

    Podcast nerds
    Nonfiction readers
    Science explainers
    Mindfulness fans
    Optimization junkies
    Self-taught polymaths

    Remember what mattered most from what you just watched or heard.

    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.

    Radiolab – "Speed"

    Why time slows down in crisis, and how brains process urgency.

    14 cards

    Veritasium – "This Is Why We Can't Have Nice Things"

    On entropy, repair, and the laws of physics that doom your favorite objects.

    10 cards

    Huberman Lab – "Tools for Better Sleep"

    Protocols, supplements, and circadian hacks that actually work.

    18 cards

    Powered bymemory science.

    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.

    Start remembering better today.

    Have a favorite podcast or video? Bring it with you.