Last updated: October 13, 2026
These Terms of Service ("Terms") govern your use of Kotoba Sensei (the "App"), developed and operated by Highnote ("we," "us," or "our"). By downloading, installing, or using the App, you agree to these Terms. If you do not agree, please do not use the App.
Kotoba Sensei is a Japanese-language learning app: vocabulary, kanji, grammar, quizzes, listening and reading practice, and spaced-repetition review tools. Nearly everything in the App runs on your device — your study content ships with the App, and your progress is saved locally on your device.
The App is intended strictly for your own private, personal study. You may not use the App, or any content, deck, or data within it, for commercial purposes, for redistribution, for resale, or on behalf of any third party (including tutoring businesses, classrooms charging tuition, or content resale of any kind) without our prior written permission.
This applies to everything the App lets you create or bring in: custom flashcard decks, exported "Kotoba Deck" files, and any content imported from a third-party source. These features exist to support your own study, and to let you move your own study material between your own devices or share a deck directly with another individual learner for their own personal study — not to build or operate a separate product, service, or distribution channel on top of the App or its content.
The App lets you import flashcard decks from third-party sources — currently, Anki .apkg deck files — as well as "Kotoba Deck" files exported from the App itself (by you or by another Kotoba Sensei user).
By importing any deck, file, or content into the App, you represent and warrant that:
You are solely responsible for the content you import. We do not review, moderate, verify ownership of, or endorse any content you import into the App, and we have no way to do so — importing happens entirely on your device; imported content is never uploaded to, or processed by, any server we operate. We disclaim all liability for any content you import, and for any claim, loss, or damage arising from your import or use of that content.
We reserve the right to, at our discretion and without liability, limit, restrict, or remove import functionality — in whole or for specific formats — at any time, including in response to legal requests, platform policy requirements, or technical constraints.
If you did not create a deck yourself, do not import it unless you are confident you have the right to use its contents for your own study.
The words, kanji, grammar points, example sentences, quizzes, and other study material built into the App (the "Library") are owned by us or our licensors and are provided for your personal use within the App only. You may not extract, copy, scrape, redistribute, or republish the Library, in whole or in part, outside the App, except as the App's own "Kotoba Deck" export feature allows for your own personal backup or for sharing a deck with another individual for their personal study, as described in Section 2.
Decks, cards, and notes you create yourself within the App remain yours. By exporting a "Kotoba Deck" file and sharing it with another person, you're granting that person a license to import and study from it personally, under the same personal-use restriction in Section 2 — you're not granting them, or us, any broader rights to it.
The App offers an optional one-time "Unlock Everything" purchase through Apple's In-App Purchase system. All purchases are billed and processed by Apple, subject to Apple's own terms and refund policies; we do not process payments directly or store your payment information.
The App is provided "as is" and "as available," without warranties of any kind, express or implied, including but not limited to accuracy of translations, definitions, or example content, or that the App will be uninterrupted, error-free, or meet your specific learning goals.
To the maximum extent permitted by law, we are not liable for any indirect, incidental, special, consequential, or punitive damages, or any loss of data, arising from your use of the App — including, without limitation, any claim arising from content you chose to import.
We may update the App and these Terms from time to time. If we make material changes, we'll update the "Last updated" date above. Continuing to use the App after changes take effect means you accept the updated Terms.
We may suspend or discontinue the App, or any feature of it (including import/export), at any time. Since your study progress is stored on your own device, uninstalling the App is sufficient to stop use and remove your locally stored data — see our Privacy Policy for details.
Questions about these Terms can be sent to highnotecollections@gmail.com.