Kardio: AI Flashcards
Study smarter with AI
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Kardio has had a complete redesign — every screen, not just the home page. Bolder color, clearer type, and creating a deck is now one tap away from anywhere in the app.
NEW: PROGRESS
See your week or your month at a glance — cards reviewed, time studied, and how far through each deck you've gotten.
NEW: AUDIO ON BOTH SIDES OF A CARD
Record one clip for the question and a different one for the answer. Useful for languages, pronunciation, or anything you need to hear rather than read.
ALSO FIXED
• Good and Easy no longer promise the same wait on older cards
• The Hard and Easy buttons now draw their full outline
• If photo access is turned off, Kardio offers to open Settings instead of leaving you stuck
• Recording no longer fails the first time you use the microphone
• Text that was cut off or hard to read on several screens
The developer, John Cooper, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- User Content
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- John Cooper
- Size
- 42.3 MB
- Category
- Education
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contains
User-Generated Content
- Copyright
- © 2026 John Cooper