One place for
everything you learn
Articles, papers, books, podcasts, courses. Powered by Claude & ChatGPT. Free for 7 days.
Articles, papers, books, podcasts, courses — all in one place. Feynman Flashcards turns every source you consume into flashcards, then uses Claude and ChatGPT to make sure the knowledge actually sticks through voice-powered review you can do anywhere.
You listened to an incredible 3-hour podcast last week. You read a fascinating paper on gene regulation. You spent a weekend binging a lecture series on statistical mechanics. Ask yourself right now: what were the key ideas? Most people retain less than 10% of what they consume after a few weeks. All that time — essentially wasted.
Feynman Flashcards is your central place for all of it — podcasts, articles, books, papers, and courses. It automatically turns every source you add into flashcards, then uses Claude or ChatGPT to test whether you can explain the ideas — not just recognize them.
If you can't explain it simply, you don't understand it well enough. Feynman Flashcards makes sure you actually do.
Start a session, put your phone in your pocket, and review entirely by voice. AI reads questions, listens to your explanations, evaluates your understanding, and reads feedback — all without touching the screen.
Claude or ChatGPT scores your answers 0–100% and tells you exactly what's missing. Bring your own API key, or subscribe for hassle-free monthly access.
Every question is rephrased by AI before you see it, preventing rote memorization of specific wording. You have to actually understand the concept.
Cards link back to their source — articles, books, papers, podcasts. Toggle source context during review for richer AI feedback.
Didn't hit 80%? AI asks targeted follow-up questions to push your understanding deeper — up to 5 rounds until you truly get it.
Paste a URL, drag a PDF, or feed in a podcast. AI generates flashcard proposals that you review before they enter your collection.
Feed in articles, book chapters, research papers, or podcast transcripts. The Studio generates flashcards automatically from any content you want to learn.
During review, every question is dynamically rephrased by AI. You can't pattern-match your way to the answer — you need to understand the underlying concept.
Type or speak your explanation. The Feynman Technique works because explaining forces you to identify what you actually know versus what you think you know.
AI scores your explanation, highlights what's missing, and asks follow-up questions until you demonstrate real understanding. Spaced repetition schedules your next review.
Native apps built with SwiftUI for iPhone, Mac, and Apple Watch.
Full review with text and voice input. Go hands-free with the OpenAI Realtime API for ultra-low latency voice sessions. Perfect for walks, commutes, or the gym.
The full experience on your desktop. Drag PDFs into Studio, review with keyboard or voice, and use local speech servers for maximum privacy. Ideal for deep study sessions.
Voice-first review from your wrist. Select decks, listen to questions, speak your answers, and tap haptic SRS buttons. No phone required.
Paste a URL, drag a PDF, or drop in a transcript. Feynman tracks all five types of content you consume — and turns every single one into knowledge that sticks.
Paste any URL and Studio extracts the key ideas automatically.
Drag in a PDF. Dense research becomes reviewable flashcards.
Add chapters as you read. Build a permanent library of what you've understood.
Feed in a transcript. Never lose the insights from a 3-hour episode again.
Paste lecture notes or transcripts. Lock in what you paid to learn.
Feynman works with Claude and ChatGPT — the two most capable AI models available. Bring your own API keys for full control, or subscribe and we handle everything.
Evaluates your explanations with nuance and context. Asks follow-up questions that probe exactly where your understanding breaks down.
Powers ultra-low latency voice sessions via the Realtime API. Speak your answers out loud and get instant spoken feedback — fully hands-free.
Articles, papers, books, podcasts, courses. Powered by Claude & ChatGPT. Free for 7 days.