Terms of Service

Nisatsu (operated by NISATSU LLC, "we") provides a language-learning reader that generates personalized stories built from vocabulary you track. These Terms govern your use of our websites (nisatsu.com and nisatsu.app) and the Nisatsu mobile app (together, the "Service"). By creating an account or using the Service, you agree to these Terms and to our Privacy Policy.

You must be at least 13 years old to use Nisatsu (16 in the EU/EEA where required by local law). If you are using the Service on behalf of an organization, you represent that you have authority to bind that organization.

You are responsible for activity that happens under your account and for keeping the device you sign in on secure. If you suspect unauthorized access, email contact@nisatsu.com and choose Sign out everywhere in Account settings.

Nisatsu Pro is offered as a monthly or annual subscription managed by RevenueCat (with payments processed by Stripe on web and by Apple or Google on mobile). Your subscription renews automatically at the end of each billing period until you cancel. You can cancel anytime from Account → Manage or cancel subscription; cancellations take effect at the end of the current period and you retain access until then. Prices may change; we will notify active subscribers before any price change applies to them.

Refund requests can be directed to contact@nisatsu.com. Local law may give you a statutory right to cancel, including a 14-day right for some EU and UK purchases. If you ask Nisatsu Pro to start now, we request your express consent and acknowledgement that this right ends once digital content is supplied. We record your consent and timestamp. This does not limit rights that cannot be waived, including rights for faulty or misdescribed content.

You agree not to:

• Use the Service to generate or share sexual content or content that is illegal, infringing, hateful, harassing, or otherwise harmful.
• Attempt to bypass the story-generation quota, rate limits, or entitlement gating.
• Automate access to the Service beyond normal personal use, or scrape bulk data.
• Reverse-engineer, probe, or disrupt the Service or its third-party integrations.
• Submit content that contains another person's personal data you do not have the right to share.

Content you submit (topics, profile fields, notes) remains yours. You grant us a limited, non-exclusive license to store, process, and display that content only as needed to operate the Service, including its sharing, moderation, and safety features. When you choose Friends or Public visibility for a story, or share your profile link, this license lets us display the selected story and profile information to the signed-in learners allowed by that choice. It does not give us ownership of your content.

Stories, and answers from the in-reader "Ask Nisatsu AI" chat, are generated by a third-party AI model at your request. We send what's needed to generate them, your known-vocabulary list (up to 5,000 words), your language pair, your topic or interests, and, for the chat, the question you type together with the passage it is about, to our AI provider, but neither we nor they use your data to train AI models (see the Privacy Policy for details). AI output can be inaccurate or culturally imperfect. Treat it as a study aid, not an authoritative source. You are responsible for what you do with it.

By default, stories you generate are private. You can share a story with accepted friends or make it public in the Community library. Other permitted learners can then see its title and contents. You can change the visibility at any time. You can also edit shared profile fields, turn profile-stat sharing off, rotate your profile link, block another learner, or delete the content or your account. Our license to display the affected content ends when it is no longer shared or is deleted, except for limited records we must retain for moderation, safety, legal, or financial reasons as described in the Privacy Policy.

The Service, including its code, branding, and UI, is our property or licensed to us. These Terms do not transfer any IP rights beyond what is needed to use the Service.

You can delete your account anytime from Account → Settings → Privacy & data → Delete your account. We may suspend or close accounts that violate these Terms, pose safety risks, or have been inactive for an extended period. Deletion removes your learning data as described in the Privacy Policy.

The Service is provided on an "as is" and "as available" basis. To the maximum extent permitted by law, we disclaim implied warranties of merchantability, fitness for a particular purpose, and non-infringement. We do not warrant that the Service will be uninterrupted or error-free, or that AI-generated content, including stories, translations, readings, and Ask Nisatsu AI answers, is accurate or complete. Check anything important against another source.

To the maximum extent permitted by law, our aggregate liability arising out of or related to the Service is limited to the greater of (a) the amounts you paid us for the Service in the 12 months preceding the claim, or (b) USD 50. We are not liable for indirect, incidental, special, consequential, or punitive damages. Nothing in these Terms excludes liability that cannot be excluded by law.

We may update these Terms. Material changes are announced in the app and take effect on the updated effective date shown at the top of these Terms. Your continued use after that date means you accept the updated Terms. If you do not agree, you can sign out or delete your account.

These Terms and any dispute arising out of or relating to them or the Service are governed by the laws of the State of Arizona (United States), without regard to its conflict-of-laws rules. The United Nations Convention on Contracts for the International Sale of Goods does not apply. Where a court or arbitrator has subject-matter jurisdiction, exclusive venue lies in the state and federal courts located in Maricopa County, Arizona, and you and Nisatsu submit to the personal jurisdiction of those courts. Nothing in this section limits a consumer's rights under mandatory local law.

Please read this section carefully. It affects your legal rights. You and Nisatsu agree that any dispute, claim, or controversy arising out of or relating to these Terms or the Service (each, a "Dispute") will be resolved by binding individual arbitration administered by the American Arbitration Association (AAA) under its Consumer Arbitration Rules, rather than in court, with the following exceptions: (a) either party may bring an individual claim in small-claims court if it qualifies; (b) either party may seek injunctive or other equitable relief in a court of competent jurisdiction to stop unauthorized use or abuse of the Service or infringement of intellectual-property rights; and (c) nothing here prevents you from reporting a concern to a government agency.

The arbitration will be conducted in English. Unless you and Nisatsu agree otherwise, the arbitration will take place in Maricopa County, Arizona or, at your request, by phone or video. The arbitrator's decision is final and binding and may be entered as a judgment in any court of competent jurisdiction. The Federal Arbitration Act governs the interpretation and enforcement of this section.

Class-action waiver. You and Nisatsu agree that each may bring Disputes against the other only in your or its individual capacity, and not as a plaintiff or class member in any purported class, collective, consolidated, or representative proceeding. The arbitrator may not consolidate more than one person's claims and may not preside over any form of representative or class proceeding. If this class-action waiver is found unenforceable as to a particular claim or remedy, then that claim or remedy (and only that claim or remedy) is severed and may proceed in court; the rest of this section remains in force.

30-day opt-out. You may opt out of this arbitration agreement by sending written notice to contact@nisatsu.com within 30 days of first accepting these Terms. Your notice must include your full name, the email or phone number associated with your account, and a clear statement that you opt out of arbitration. Opting out does not affect any other provision of these Terms.

If any provision of these Terms is held invalid, illegal, or unenforceable by a court or arbitrator of competent jurisdiction, that provision will be enforced to the maximum extent permitted and the remaining provisions will remain in full force and effect. A failure or delay by either party to enforce any right under these Terms is not a waiver of that right.

These Terms, together with the Privacy Policy and any other policies referenced in them (including the Community Guidelines and DMCA policy), are the entire agreement between you and Nisatsu about the Service and supersede any prior agreements on the same subject.

We send you essential service messages, account, security, verification, billing, and legal notices, as part of operating the Service. These are not marketing and you cannot opt out of them while you have an account.

We send marketing email (occasional updates about new languages, features, and stories) only if you opt in; the box at sign-up is unchecked by default and optional. You can withdraw consent at any time from the Marketing emails toggle in Account → Settings → Privacy & data, or via the unsubscribe link in any such email. How we handle this is described in the Privacy Policy.

Questions about these Terms: contact@nisatsu.com.