Terms of Service

These Terms of Service ("Terms") govern your access to and use of the JLPT Master mobile application and related services (the "App"). Please read them carefully. By creating an account, tapping "I agree", or otherwise using the App, you agree to be bound by these Terms. If you do not agree, do not use the App.

1. Who we are

The App is operated by an individual developer based in Japan under the Nihongo Club Sakura brand ("we", "us", "our"). JLPT Master is the App name. You can reach us at nihongoclubsakura@gmail.com.

2. Eligibility and age requirement

You must be at least 18 years old to create an account or use the App. After sign-in and before using the App, we ask you to confirm that you meet this age requirement. If you are under 18, do not create an account or use the App. Permission from a parent or legal guardian does not waive this minimum-age requirement.

If you are 18 or older but have not reached the age at which you can enter into these Terms independently where you live, you may only use the App with the consent and supervision of a parent or legal guardian where local law requires it.

3. Your account

You may sign in using Google, or an email address and password. On iOS you may also sign in using Apple. You are responsible for keeping your login credentials secure and for all activity that occurs under your account. Notify us promptly at the email above if you suspect unauthorized use.

4. Licence to use the App

We grant you a personal, limited, non-exclusive, non-transferable, revocable licence to install and use the App on devices you own or control, solely for your own non-commercial study purposes.

The App is distributed through the Apple App Store and Google Play. Your use is also subject to the terms of the store you installed from:

• Apple App Store — Apple's standard Licensed Application End User Licence Agreement ("EULA"), available at https://www.apple.com/legal/internet-services/itunes/dev/stdeula/.
• Google Play — the Google Play Terms of Service, available at https://play.google.com/intl/en_us/about/play-terms/.

Where these Terms and the applicable store terms conflict, the stricter provision applies. Each store is a third-party beneficiary of these Terms as they relate to your licence, and neither store is responsible for the App or for providing support for it.

Except for content you submit and third-party materials, all rights in the App, including the software, questions, explanations, study content, design, our names, our logos, and other materials, are owned by us or our licensors. We do not grant you any rights except the limited licence stated in these Terms.

5. Things you agree not to do

You agree not to:

• copy, modify, reverse-engineer, decompile, or create derivative works of the App except where such restriction is prohibited by law;
• resell, sublicense, rent, or commercially exploit the App or its content;
• use the App to break any law or infringe anyone's rights;
• attempt to gain unauthorized access to our systems, disrupt the service, or circumvent usage limits, paywalls, security measures, or flashcard export restrictions;
• export, extract, copy, or redistribute JLPT Library or other app-exclusive flashcard content (see Section 8);
• upload unlawful, abusive, or infringing content.

6. Study content and accuracy

The App provides practice questions, mock exams, scoring estimates, and study analytics for the Japanese-Language Proficiency Test (JLPT). The JLPT is administered by third parties. "JLPT" and "Japanese-Language Proficiency Test" are used only to identify the exam you are studying for; we are not affiliated with, endorsed by, or sponsored by the official JLPT organizers. Scores, JLPT-style scaled score estimates, level estimates, and pass predictions are estimates for study purposes only. They are not official JLPT scores, are not official JLPT-equivalent results, and do not guarantee any result on the official examination. Our scoring methods, formulas, item parameters, and analytics may change over time.

We add, expand, update, and correct study content (including questions, mock exams, and additional JLPT levels) on an ongoing basis. We do not guarantee that any particular content, level, or feature is or will be available at any given time, or that it will be released by any particular date.

7. User-submitted content

The App lets you report questions or submit feedback. You are responsible for what you submit and grant us a worldwide, royalty-free licence to use it for operating and improving the App. Do not submit anything you do not have the right to share.

8. Flashcards

The App includes flashcards. Decks, cards, review history, and media you keep in the App are stored only on your device. We do not store that data on our servers, cannot access it, and cannot back it up or restore it for you. You are solely responsible for keeping copies of any decks you create or import. Uninstalling the App, losing or resetting your device, or clearing the App's data will permanently delete local flashcard data unless you have exported a copy.

You may export decks you created or imported yourself, using the App's export tools, for your own backup.

JLPT Library decks (including teacher-catalog content added from inside the App) are app-exclusive. They are licensed only for use inside the App and must not be exported, copied, extracted, shared, or redistributed. The App blocks export of that content. Circumventing that restriction, or otherwise removing JLPT Library content from the App, is a breach of these Terms and may result in suspension or termination of your account.

9. Subscriptions, purchases, and billing

The App offers optional paid subscriptions and in-app purchases that unlock premium features.

Who bills you depends on where you installed the App. We never receive or store your payment details.

• Billing is handled by the store, not by us — Apple through the App Store on iOS, and Google through Google Play on Android. Payment is charged to your Apple Account or your Google Play payment method at confirmation of purchase.
• Auto-renewal: subscriptions renew automatically for the same period and price until you cancel. To avoid being charged for the next period, cancel before the current period ends — on the App Store, at least 24 hours before the renewal date.
• Managing or cancelling a subscription is done in the store that sold it: your Apple Account subscription settings, or the Google Play subscriptions screen. We cannot cancel a subscription for you. Deleting your in-app account does not automatically cancel a store subscription, and you will keep being billed until you cancel it in the store.
• Refunds are decided by the store under its own policies — Apple for App Store purchases, Google for Google Play purchases. We cannot issue refunds for purchases either store processed. If a refund is granted, your premium access for the refunded period will be revoked. Where local consumer law gives you a refund or withdrawal right directly against us, that right is unaffected.
• One subscription per store account. A store account (an Apple Account or a Google account) holds one subscription at a time. If you restore or re-verify a purchase while signed in to a different in-app account, we move that subscription to the in-app account you are currently signed in to, and the previous in-app account loses premium access. We do this so a paying customer is never locked out of what they bought; it is not a way to share one subscription between people.
• What a subscription covers: an active subscription gives you access to the premium content and features available from time to time. New content and JLPT levels we release are added to your active subscription at no additional charge. We do not commit to any release date, and the value of the subscription is the access provided while it is active, not any specific future content.

The price, billing period, trial terms if any, and renewal terms are shown in the store's purchase sheet before you confirm. Prices and offerings may change; changes do not affect a period you have already paid for unless the store or applicable law allows otherwise.

10. Virtual items, XP, and in-app rewards

The App includes a rewards system that may grant experience points ("XP"), badges, mock-exam credits, and other virtual items (together, "Virtual Items") for activity such as completing practice sessions, finishing mock exams, or watching rewarded ads.

Virtual Items:

• have no monetary value, are not your property, and represent only a limited, personal, revocable, non-transferable licence to use them within the App;
• cannot be sold, traded, transferred, gifted, or exchanged for cash or anything of value, inside or outside the App; and
• are not money, bank credit, securities, or any stored-value or payment instrument.

Because the rewards system is part of how we design, balance, and operate the App, we may change it at any time, at our sole discretion, without prior notice and without liability to you. This includes, without limitation, the right to:

• adjust how much XP or how many credits any activity earns, including the formulas, rates, multipliers, and caps used to calculate them;
• set, shorten, extend, or remove expiration dates for XP, credits, or other Virtual Items, or cause them to expire;
• modify, suspend, reset, recalculate, or revoke Virtual Items, including where we reasonably suspect error, abuse, or a breach of these Terms; and
• limit, suspend, or discontinue the rewards system entirely, in whole or in part.

We are not required to give advance notice of these changes, and we will not owe you any refund, compensation, or replacement for any change to, reduction in, or expiration or loss of Virtual Items. Virtual Items are not part of any paid subscription or purchase; your paid entitlements are governed by Section 9 and are not reduced by changes to the rewards system.

11. Advertising

The free tier of the App may show advertising provided by third parties, including Google AdMob. Ads may include banner, interstitial, and rewarded ads. Rewarded ads are optional; rewards are granted only when the ad network confirms completion, and we do not guarantee that a rewarded ad will always be available. Where required, we ask for your consent to personalized advertising before showing such ads, and you can change or withdraw that choice at any time from the Privacy Center. Premium removes ads. See our Privacy Policy for details.

12. Changes to the App and these Terms

We may add, change, or remove features at any time. We may also update these Terms. When we make material changes, we will update the version and "last updated" date and, where appropriate, ask you to accept the updated Terms before continuing to use the App. Your continued use after an update means you accept the revised Terms.

13. Termination

You may stop using the App and delete your account at any time from the Privacy Center, or by emailing us at the address above. We may suspend or terminate your access if you breach these Terms or use the App in a way that could harm us or other users. Account deletion does not cancel a subscription bought through the App Store or Google Play — cancel that separately in the store that sold it, or you will keep being billed. Deletion may also not remove records we must retain for legal, tax, security, fraud-prevention, or dispute-resolution purposes, as explained in our Privacy Policy.

14. Disclaimers

The App is provided "as is" and "as available" without warranties of any kind, to the fullest extent permitted by law. We do not warrant that the App will be uninterrupted, error-free, or that study results will be achieved.

15. Limitation of liability

To the fullest extent permitted by law, we will not be liable for any indirect, incidental, special, consequential, or punitive damages, or for any loss of data, profits, or study outcomes arising from your use of the App. Nothing in these Terms limits liability that cannot be limited by law.

16. Governing law and disputes

These Terms are governed by the laws of Japan, without regard to conflict-of-law rules, except where mandatory consumer-protection laws of your country of residence apply. Many countries give you local statutory rights that these Terms do not override.

17. Contact

Questions about these Terms? Email us at nihongoclubsakura@gmail.com.

Last updated: September 3, 2026 · Version 2026-09-03.1