Flashcards & Spaced Repetition

About

Master anything with science-backed spaced repetition — right from your browser.

Flashcards & Spaced Repetition uses the FSRS-4.5 algorithm (Free Spaced Repetition Scheduler) with pre-trained weights from the open-spaced-repetition community to schedule your reviews at the optimal moment, just before you're about to forget.

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🧠 CORE FEATURES

• Smart Scheduling (FSRS-4.5) — Every card is individually tracked with stability, difficulty, and retrievability metrics. Reviews are scheduled at the mathematically optimal interval for 90% retention.

• Multiple Practice Modes — Flashcard mode (classic flip-and-rate), Multiple Choice (MCQ), and flexible direction: Forward, Reverse, or Mixed.

• 4-Point Rating System — Rate each card as Forgot, Almost, Got It, or Easy. The algorithm adjusts intervals precisely based on your response.

• Due Review Filter — Practice only cards that are due, or review your entire deck. Cards you forget are automatically re-queued within the same session.

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🎯 MEMORY ENCODING TOOLS

Three cognitive science tools to supercharge your initial learning:

• Dual Coding — Assign visual emojis to each card. Storing information in two formats (verbal + visual) nearly doubles retention.

• Chunking — Write mini-stories, acronyms, or mnemonics that link prompts and answers into memorable patterns.

• Method of Loci — Place each item in a room of your mental memory palace. Vivid, exaggerated mental images create powerful recall anchors.

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📚 DECK MANAGEMENT

• Smart Content Parser — Paste vocabulary lists, markdown tables, tab-separated data, numbered lists, or colon/dash-separated pairs. The parser auto-detects the format and creates cards instantly.

• Import & Export — Full JSON import/export to back up your decks or share them with others.

• Card Maturity Tracking — Each card shows its learning stage: New → Learning → Young → Review → Mature.

• Study Streak — Track your daily consistency with an automatic streak counter.

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⚡ DESIGNED FOR SPEED

• Opens instantly from the toolbar — no new tabs, no loading screens.
• Works 100% offline after installation. Zero network requests.
• All data stored locally in your browser. Nothing leaves your device.
• Keyboard shortcuts: Space to reveal, 1-4 to rate.
• Session state persists across popup open/close — pick up exactly where you left off.

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🔬 THE SCIENCE

Spaced repetition exploits the "spacing effect" — the finding that information is better retained when reviews are spread out over increasing intervals rather than crammed in a single session. The FSRS algorithm models your memory mathematically, predicting exactly when each card's retrievability will drop below 90%, and scheduling the review just before that point. This means you spend the minimum time reviewing for maximum retention.

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PERFECT FOR:
• Language learners (vocabulary, grammar, phrases)
• Medical & nursing students (anatomy, pharmacology, pathology)
• Law students (case law, statutes, definitions)
• Certification prep (IT, finance, professional exams)
• Trivia & general knowledge enthusiasts
• Anyone who needs to memorize facts efficiently

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GET STARTED IN SECONDS
1. Install the extension
2. Click the icon in your toolbar
3. Try the included sample decks or paste your own content
4. Use memory tools to encode, then practice to retain

No account required. No sign-up. No data collection. Just learning.