Kardio turns anything you're learning into flashcards, then tells you exactly what to study today.
Paste your notes, upload a PDF, Word or text file, or drop in a web link, and Kardio drafts clear question-and-answer cards in seconds. You check every single one before it's saved.
Then it handles the part most of us get wrong: bringing each card back at the right moment, for weeks and months, until you really know it.
MAKE THE CARDS IN SECONDS
Pick the kind of cards you need:
- Key facts and definitions
- Step-by-step procedures
- Language vocabulary
- Exam-style multiple choice
- Import a past exam or quiz, with the questions kept exactly as written
Everything lands in a review list first. Edit it, rewrite it, delete it, then save what you want. Nothing goes into a deck behind your back.
STUDY ONLY WHAT'S DUE
Spaced repetition brings each card back just before you'd forget it. Answer, then grade yourself: Again, Hard, Good or Easy. Kardio shows what each button will do before you tap it (ten minutes, three days, three weeks) and schedules the card for you. Get one wrong and it comes back in the same session until it sticks. Tapped the wrong grade? Undo it.
A DAILY GOAL YOU CAN ACTUALLY HIT
Your home screen shows what's due today and nothing else, so there's no deciding where to start. Keep your streak going, and finish with a summary of how the session went and when the cards are coming back. Two minutes in line counts.
DECKS TO START FROM
Browse public decks in Explore and copy any of them into your own library, or begin with one of the starter decks. Made something good? Publish it so other people can use it too.
FOR WHATEVER YOU NEED TO REMEMBER
Studying for high school or college exams. Getting through a reading list. Learning Spanish properly this time. Preparing for a certification, a promotion board or a professional exam at work. Putting a set of cards together for your class. If it can be written as a question and an answer, Kardio will help you keep hold of it.
THE DETAILS
- Sign in with Apple, Google or email; an account keeps your decks and progress safe
- Write and edit your own cards by hand whenever you like
- Add a picture or a voice recording to a card
- Light and dark themes
- Report or block anything you don't want to see in shared decks
- No ads and no subscription
ABOUT THE AI
When you generate cards, the text, file or link you pick is sent to Kardio's own server, which passes it to Anthropic's Claude to draft the cards. It's used for that one request and nothing else, and your material isn't used to train AI models. You see and approve every card before it's saved. There's a daily limit on how much you can generate.
Kardio is made in the UK by one person, for people who have to remember things for real: exams, procedures, a new language, the parts that matter at work.
Questions or ideas? Use the support link on this page. I read every message.
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