Flashcards built on the science of forgetting
Lexie uses the FSRS spaced repetition algorithm to schedule every card at the moment you're about to forget it. The result is long-term retention with less total study time.
Download for iOS
How Lexie's flashcards work
Generated from your own material
Lexie reads your notes, textbook, or worksheet and creates structured question-and-answer flashcards automatically. Each card isolates a single concept — no vague multi-part cards, no copied sentences. The same principles that make a manually crafted Anki card effective, without the hours of manual creation.
Spaced repetition with FSRS
FSRS (Free Spaced Repetition Scheduler) is the same algorithm used by advanced Anki users. It models how your memory decays over time and schedules each card review at the optimal interval. Cards you know well appear less often. Cards you struggle with come back sooner. Every review session is built from what you most need to practise right now.
Active recall, not passive flipping
Lexie doesn't just show you the answer side of a card. It generates fill-in-the-blank questions, typed recall prompts, and matching exercises alongside standard flashcards. Producing an answer from memory strengthens retention far more than recognising one when you see it.
Know / Still Learning
During review, you swipe each card as Know or Still Learning. That rating feeds directly into the FSRS algorithm, adjusting the next review interval in real time. No complex grading scales — just an honest assessment that keeps the schedule accurate.
The research behind it
Why spaced repetition works
Ebbinghaus demonstrated in 1885 that memory decays exponentially without reinforcement. Spaced repetition works by interrupting that decay at precise intervals, strengthening the memory trace each time. Hundreds of studies since have confirmed that distributed practice outperforms massed practice for long-term retention.
Why active recall matters
Roediger and Karpicke (2006) showed that actively retrieving information from memory produces stronger retention than re-reading the same material. This is the testing effect — the act of being tested is itself a learning event, not just a measurement of what you know.
Why your own material matters
The generation effect (Slamecka & Graf, 1978) demonstrates that information you process and engage with is remembered better than information passively received. When Lexie builds cards from your own notes, the content is already contextualised in your learning. You're not studying someone else's interpretation of a topic.
Built for serious study
34+ languages
Lexie auto-detects the language of your content and generates flashcards accordingly. Audio pronunciation is available for language learning cards so you hear the correct pronunciation as you review.
Dyslexia-friendly mode
Switch to OpenDyslexic font and adjusted spacing. Study tools should be accessible to everyone, not just students who fit a standard reading profile.
Audio review
Listen to your study material read aloud with adjustable playback speed. Review while commuting, walking, or when your eyes need a break from the screen.
Works offline
All study data is stored locally on your device. No account, no cloud dependency, no interruptions. Your flashcards work wherever you are.
Frequently asked questions
Stop re-reading. Start remembering.
Lexie's flashcards use active recall and spaced repetition to move information into long-term memory. Photograph your notes and start with 3 free study sets.