How Kazu-SRS works
Kazu-SRS is built around a simple cycle: answer questions, review what still needs work, and keep moving forward.
Your first session
N5+, N4+, N3+, and Buying Mittens: leave Mode on Smart Start, press Start, and choose an English meaning. After answering, read the examples; Show Extra opens the fuller explanation. Use Next to continue. The furigana switch is Furi ON/OFF in N5–N3 and Furigana ON/OFF in Buying Mittens.
N2 Grammar: leave the mode on Kazu-SRS and press 開始 (start). Choose the expression that completes the sentence. After answering, read the completed sentence and the reason, then open 詳しい解説 for more detail. 次へ means next. This app’s controls and explanations are in Japanese.
If you guessed correctly but are not confident, choose Mark as Miss in N5–N3, Mark as Incorrect in Buying Mittens, or 不正解にする in N2. Confirm to turn that answer into a review item. Keep as Correct (or 正解のままにする in N2) keeps the correct answer. Both default modes start with reviews that are due, then move on to general practice.
1. Start by answering
You do not need to begin by rating every item as easy, hard, known, or unknown. Answer the question first. Kazu-SRS records the result and uses that history to guide later review.
The goal is to spend less time on material you already know and more time on what still needs work.
2. Review what you need, when you need it
Items you miss can return later for review. In some sets, the interval between reviews gradually increases as your answers become more consistent.
Not every Kazu-SRS set works in exactly the same way. The right learning unit and the right kind of support depend on what you are studying—grammar, vocabulary, or the language used in a particular work. The shared idea stays the same, but each set is adapted to the material.
3. The material comes first
JLPT N2 Grammar, for example, tracks all 697 multiple-choice questions independently. That makes it possible to distinguish between questions you can answer reliably and questions that still cause trouble, even when they belong to the same grammar point.
Kazu-SRS sets built around a particular work focus on the vocabulary and expressions you need to read that work.
The material is not forced into a single template. Kazu-SRS is adjusted to fit what you are learning.
4. Explanations are part of the study
After answering, you can read examples and explanations when they are included in that set. The aim is not only to remember the correct choice, but to understand how the language is used and how similar expressions differ.
Support such as furigana is also provided where it is useful, and can be turned off when you no longer need it.
5. Your study data stays in your browser
Kazu-SRS normally stores your study history in your browser. Kazu Nihongo does not receive or store your individual study history.
Your progress does not automatically sync to another browser, browser profile, or device. Switching devices does not itself delete the record in your original browser. Clearing site data, closing a private-browsing session, or browser storage removal can delete it. All five current SRS sets include backup and restore; save backups regularly.
6. A simple way to use it
- Choose the material you want to study.
- Answer the questions.
- Review missed items and anything that is due for review.
- Read the examples or explanations when the reason is not yet clear.
- Come back later and continue from your saved progress.
Exact modes and controls vary by set. For details, use the guide inside each Kazu-SRS app.
Keep your progress when you change devices
- In the original browser, open the set and press Backup. In N2, use バックアップ. Keep the downloaded JSON file.
- Open the same set on the new device. Use Restore / 復元, select that file, and read the confirmation.
- Restoring replaces that set’s current record in the receiving browser; it does not merge two records. Back up that browser’s record first if you need it, and close other tabs running the same set while restoring.
Each set has its own backup. An N5 backup cannot restore N4, N3, N2, or Buying Mittens. Download a fresh backup after studying on a different device; progress does not travel back automatically.
My progress looks empty. What should I check?
First check the site address, browser, and browser profile you used before. An in-app browser opened from a messaging app, a different profile, or private browsing may use a different storage area. Check the original browser before assuming the data has been deleted. Restore a saved backup when needed; Reset is not a recovery tool.
When does a missed vocabulary card come back?
In N5+, N4+, and N3+, the first scheduled review is about 10 minutes after a miss. When you answer that due review correctly, the next interval is measured from that answer: for example, a miss at 9:00 makes the card due at 9:10; a correct due answer at 9:10 makes it due at 9:40. If you return later, it remains due until you review it.
Quick retries a few questions after a miss are for immediate practice; they are different from scheduled Due reviews. You do not need to keep the screen open or wait for a notification. Return when convenient and use Smart Start. For a session focused on low-accuracy items, choose Weak Point.
Which explanation should I read?
In the vocabulary apps, the two main example sentences have English translations. Show Extra contains the fuller explanation, with M for Meaning, U for Usage, and N for Note. In N2, the reason after each answer explains that particular question; 詳しい解説 covers the grammar point more broadly.