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Legal · effective 22.10.2026

Terms of service

The agreement between you and Maksym Sai for using Nihontekini.

The short version

Your decks stay yours. Be kind to the service and to other people. Plus goes through the App Store. The dictionary data is shared under open licences. Awawa-chan read all of it so you don't have to.

1. Agreeing to these terms

By using the Nihontekini app, its servers or this website you agree to these terms and to our privacy policy. If you download the app from the App Store, Apple’s standard licence agreement also applies; where the two differ, these terms add to it. If you do not agree, please do not use Nihontekini.

2. The service

Nihontekini is a Japanese flashcard app for iPhone. You can use it as a guest, with everything stored on your phone, or with an account that adds backup, sync across devices and connections to AI agents. We may add, change or remove features over time.

3. Your account

You sign in with a working email address, or with Apple or Google. Keep access to that email or account safe: anyone who can receive your sign-in codes can sign in as you. One account is for one person. You must be at least 13 to create one.

4. Your decks and notes

You own the decks, cards and notes you create, including those you import from a chatbot or that an agent adds for you. You give us permission to store, process and sync that content only so we can run the service for you.

You are responsible for what you import. Only add content you have the right to use, and do not use Nihontekini to store anything illegal or harmful.

5. Chatbots and AI agents

Nihontekini works with chatbots and agents run by other companies, such as Claude, ChatGPT and Cursor. Your use of them is governed by their own terms. We do not control what they produce and cannot promise that their answers are correct, so check what you import.

An agent you connect over MCP acts on your behalf within the permissions you choose: it may read your decks and progress, add, edit, suspend or delete cards, and make quizzes. You are responsible for what it does with your account. Batches an agent adds can be undone for 7 days, and you can revoke an agent at any time in the app.

6. Free plan and Plus

Studying your own cards is never limited. On the free plan, agents may add 50 cards and make 3 quizzes a month, Test me can be started once a day, and the ready decks for N5 and kana are included. Plus lifts these limits and unlocks the N4 to N1 decks. We may change what each plan includes; a change will not take away something you have already paid for during the current period.

Plus is sold through the App Store as a monthly or yearly subscription, or as a one-off lifetime purchase. Payment is charged to your Apple ID. A subscription renews automatically unless you cancel it at least 24 hours before the end of the current period, in Settings, then your name, then Subscriptions. Cancelling stops the next renewal; Plus stays on until the period ends. Prices are shown in the app before you buy. Refunds are handled by Apple under its policies.

“Lifetime” means for as long as Nihontekini is offered. If we ever shut the service down, the app will keep working offline for studying the decks on your phone.

7. Dictionary data

Meanings, readings, kanji details, stroke order and example sentences come from open projects, used under their licences. Data from them is shared under the same terms:

8. Fair use

Please do not:

  • Try to get around rate limits or plan limits, or overload or disrupt our servers.
  • Scrape the service or its dictionary in bulk, or resell access to it.
  • Access another person’s account or data without permission.
  • Use the service to break the law or to harm others.

9. Our app

The Nihontekini app, its design, Awawa-chan and this website belong to Maksym Sai. These terms let you use them for your own learning; they do not transfer any ownership.

10. Availability and changes

We work to keep Nihontekini running, but it may sometimes be unavailable. Studying works offline, so your daily reviews do not depend on our servers.

11. Ending your use

You can stop using Nihontekini and delete your account at any time in the app. Deleting your account does not cancel an App Store subscription; cancel that in your Apple ID settings. We may suspend or close an account that seriously or repeatedly breaks these terms; where we reasonably can, we will tell you first and let you export your decks.

12. No guarantees

Nihontekini is provided as is. We do our best to make cards accurate and scheduling useful, but we cannot guarantee that the content is free of errors or that you will reach a particular level. To the extent the law allows, we are not liable for indirect or consequential losses. Nothing in these terms limits rights you have under consumer law where you live.

13. Changes, law and contact

If we change these terms in a way that matters, we will tell you in the app before the change takes effect. These terms are governed by the laws of Ukraine. Questions: help@nihontekini.app.