Kanjidou
Getting Started

Terms of Service

Allgemeine Geschäftsbedingungen (AGB) / 利用規約

1. Operator and scope

These Terms govern your use of Kanjidou. The operator's contact details are listed in the Impressum. (Impressum)

2. The service

Kanjidou is a web app for learning kanji and vocabulary with spaced repetition. One account may register up to 10 learners (children).

The service uses AI in some features (for example the support chat).

3. Accounts and eligibility

Accounts are created and managed by a parent or guardian. Children's learning data is handled as described in the Privacy Policy. (Privacy Policy)

4. Fees, free trial and billing

BETA — During the BETA sign-up period Kanjidou is free — you can keep using it after the 30-day period, with no subscription required.

5. Cancellation and refunds

You can cancel at any time. You may either cancel immediately and receive a pro-rata refund for the unused part of the current billing period, or keep access until the end of the paid period. The cancellation page shows both options.

6. Right of withdrawal (consumers)

If you are a consumer, you have the right to withdraw from the paid subscription contract within 14 days without giving any reason. The withdrawal period is 14 days from the day the subscription contract is concluded (the day you start a paid subscription). The 30-day free trial requires no payment, so no charge arises if you stop during it.

To exercise the right of withdrawal you must inform us by a clear statement — for example an email to the contact address in the Impressum — of your decision to withdraw. You may use the model withdrawal form, but it is not obligatory. To meet the deadline it is enough that you send your notification before the withdrawal period expires. Model withdrawal form

If you withdraw, we will refund all payments we received from you without undue delay and at the latest within 14 days of the day we are informed of your decision. We use the same means of payment you used for the original transaction, and you incur no fees for the refund.

Because a subscription gives you immediate access to a digital service, by subscribing you expressly request that performance begin during the withdrawal period and acknowledge that, if you withdraw, you may owe a proportionate amount for the use made up to that point.

7. Acceptable use

You agree not to misuse the service — for example no unauthorized access, automated scraping, resale, or attempts to disrupt or reverse-engineer the service.

8. Intellectual property

The service and its content are protected by intellectual property rights.

The service also uses dictionary data published by third parties under an open licence:

9. AI-generated content

Some content is generated with the help of AI and may contain mistakes. It is provided to support learning and is not professional advice; please double-check anything important.

10. Disclaimer and limitation of liability

We provide the service with reasonable care, but we cannot guarantee that it will always be available or that it will be uninterrupted or free of errors. As stated in Section 9, AI-assisted content may contain mistakes and is not professional advice.

We are liable without limitation for damage caused intentionally or by gross negligence, for injury to life, body or health, under the German Product Liability Act (Produkthaftungsgesetz), and to the extent we have given a guarantee.

For slight negligence we are liable only where a material contractual obligation has been breached — an obligation whose fulfilment makes the proper performance of the contract possible in the first place and on whose observance you may regularly rely — and in that case only for the foreseeable damage typical for this kind of contract. Any further liability is excluded.

Nothing in these Terms excludes or limits any liability that cannot be excluded or limited under applicable mandatory law.

11. Changes to the service and these Terms

We may change the service and these Terms — for example to add a feature or retire one, to fix a security problem, to follow a change in the law, or to change the price. We will not use a change to these Terms to take away something you have already paid for.

We announce changes to these Terms and to the price by email, to the address registered on your account — the address you sign in with — at least 30 days before they take effect. We do not rely on a banner inside the app: reaching you is our responsibility, not yours. A change we have to make immediately for security or legal reasons may take effect sooner, and we will tell you as soon as we can.

A price change never affects a billing period you have already paid for. An increase applies only to billing periods beginning after the 30 days' notice, and you are free to cancel before then under Section 5. A reduction takes effect automatically and needs nothing from you.

We do not sell personal data, and we do not pass learning data to third parties for their own purposes. Changing that would take more than a change to these Terms: we would have to ask each of you individually, and continuing to use the service would never count as agreement. If you said no, you would keep the service exactly as before. None of this covers anonymous statistics that cannot be traced back to any account or learner.

12. Termination

You may stop using the service and delete your account at any time. We may suspend or terminate accounts that violate these Terms.

13. Governing law and jurisdiction

These Terms are governed by the laws of Germany. The mandatory consumer-protection provisions of your country of residence remain unaffected.

Last updated: 2026-08-09