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About Koydo Flashcards
Koydo Flashcards gives you 15 million+ human-curated cards across 21 subjects and six age tiers — from early learners to university — with smart spaced repetition that times every review for you and live Study Rooms for studying with friends. It is made by Koydo, a learning company building beautiful, evidence-based study tools.
Every card is curated by people and credited to its source — none is bulk-generated by AI. You can check where a card came from on the card itself. See our sources and methodology.
Spaced repetition and active recall are among the most studied ideas in learning. We build them in so the timing is handled for you — no setup, no decks to schedule by hand.
Each subject has its own visual style, so studying feels like something you want to come back to — not a chore.
Six age tiers mean the same trusted library meets a six-year-old and a graduate student each where they are.
Who curates the library
Koydo Lyceum is the team that selects open sources, writes original cards where no good source exists, and reviews the library for accuracy. They decide what goes in, credit where it came from, and keep it current.
Koydo Flashcards is an independent study aid. It is not affiliated with, endorsed by, or sponsored by any school, university, exam board, or the owners of any other study app we compare ourselves to. Trademarks belong to their respective owners and are used only to describe what each tool does.