Spaced Repetition Deck (SRS)

Review Japanese vocabulary, Kanji, and grammar with our intelligent Spaced Repetition System (SRS) algorithm.

Memory Science

Spaced Repetition System (SRS) Guide: Hack the Forgetting Curve

Retain thousands of Japanese vocabulary words and Kanji permanently through scientifically timed review intervals.

The Cognitive Science Behind Spaced Repetition

In 1885, German psychologist Hermann Ebbinghaus discovered the 'Forgetting Curve': humans forget approximately 50% of newly learned information within 24 hours, and up to 80% within a week, unless the memory is actively retrieved.

Traditional study methods—such as cramming before an exam or writing a word 50 times in a row—create high short-term familiarity but fail to produce permanent memory. Spaced Repetition Systems (SRS) calculate the exact psychological moment when your brain is about to forget an item, scheduling a review at expanding intervals (1 day, 3 days, 7 days, 16 days, 35 days, 90 days). Each successful recall permanently cements the memory into your long-term cerebral storage.

✓ Hacks the Ebbinghaus forgetting curve by reviewing items right before memory decay.
✓ Expanding review intervals maximize memory consolidation with minimal daily time investment.
✓ Allows self-studying learners to effortlessly retain 2,000+ Kanji and 6,000+ vocabulary words.

Step-by-Step Study Method: The 15-Minute Daily SRS Habit

Follow this high-efficiency protocol to keep your review queue clean and stress-free.

Step 1: Do Your Reviews First Thing Every Morning

Make SRS review a non-negotiable morning habit before checking social media or email. Reviews take only 10 to 15 minutes and ensure your queue never piles up.

Example: Review 30 to 50 due cards during your morning commute or coffee.

Step 2: Limit New Cards to 10-15 per Day

The number one reason learners abandon SRS is adding too many new cards at once, creating an unmanageable avalanche of 200+ reviews a week later.

Example: 10 new cards per day = 300 words a month = 3,650 words a year!

Step 3: Be Completely Honest with Your Self-Grading

When rating your recall (Again, Hard, Good, Easy), never grade a card 'Good' if you merely recognized it after peeking or hesitated for 30 seconds.

Example: Hit 'Again' without shame when you hesitate—seeing the card again soon strengthens the weak synapse!

Step 4: Always Pronounce the Word Aloud

Engage vocal motor memory: say the Japanese word and its meaning out loud before flipping the card.

Example: Listen to the native audio confirmation to reinforce authentic pitch accent.

Common SRS Mistakes to Avoid

Avoid these critical errors that lead to SRS burnout.

× Allowing Due Reviews to Pile Up for Weeks

Skipping reviews for several days causes cards to accumulate into an intimidating mountain of 300+ due items.

✓ Correction: If your queue piles up, stop adding new cards entirely and clear 30 due reviews per session until caught up.

× Adding Isolated Words with Zero Context

Memorizing abstract words without example sentences makes retrieval much harder.

✓ Correction: Use full example sentences and vivid mnemonic images on your flashcards.

× Flipping Cards Too Fast Without Real Active Recall

Quickly clicking through cards based on vague visual familiarity does not stimulate true retrieval pathways.

✓ Correction: Formulate the exact reading and meaning in your mind BEFORE flipping the card.

JLPT Exam Preparation with SRS

JLPT N5-N1

• Start your SRS deck at least 3 months prior to your target JLPT test date.
• Set all target level vocabulary to mature status (intervals of 21+ days) at least two weeks before exam day.
• Use reverse cards (English to Japanese) to build active productive mastery alongside passive recognition.

Frequently Asked Questions

How does the KANA Learning SRS algorithm work?

Our system is inspired by the SuperMemo SM-2 and modern FSRS algorithms, calculating personalized review intervals based on your historical accuracy and card difficulty.

What should I do if my review queue has over 200 due cards?

Don't panic! Pause all new cards, set a 15-minute timer twice a day, and chip away at the queue. You will clear the backlog within 3 to 4 days.

How many reviews can I expect each day?

If you add 10 new cards daily, your steady-state daily review load will typically stabilize between 40 and 60 quick cards (about 10 to 12 minutes).

Can I add my own custom vocabulary words to the SRS deck?

Yes! You can mine sentences and vocabulary directly from our Graded Readers, Dictionaries, and Immersion tools into your custom deck.