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Terms of Use

Last updated: 31 May 2026

These Terms of Use ("Terms") govern your use of Patter ("the app"), an iPhone language-learning application published by vilaverdeapps ("we", "us", "our"). By downloading, installing, or using the app, you agree to these Terms. If you do not agree, do not use the app.

The app is also subject to the Apple Media Services Terms and Conditions and Apple's Standard End User License Agreement (EULA), which apply to all apps distributed via the App Store. Where these Terms conflict with Apple's EULA for matters that EULA exclusively governs, Apple's EULA controls.

1. Eligibility

You must be at least 13 years old (or the minimum age of digital consent in your country, whichever is higher) to use the app. The app is not directed to children. Parents and guardians should use Apple's Screen Time and Family Sharing controls if needed.

2. License

We grant you a limited, personal, non-transferable, non-exclusive, revocable license to install and use the app on Apple-branded devices that you own or control, solely for your personal, non-commercial language-learning use, and subject to these Terms and Apple's EULA.

You may not:

  • copy, modify, reverse-engineer, decompile, or disassemble the app, except where permitted by law;
  • rent, lease, lend, sell, redistribute, or sublicense the app;
  • use the app to build a competing product or to train machine-learning models;
  • circumvent subscription, rate-limit, or entitlement mechanisms.

3. Subscriptions and in-app purchases

The app offers optional auto-renewing subscriptions processed by Apple's App Store.

  • Auto-renewal: Subscriptions renew automatically at the end of each period at the then-current price unless canceled at least 24 hours before the end of the current period.
  • Payment: Payment is charged to your Apple ID at confirmation of purchase. Renewals are charged within 24 hours prior to the end of the current period.
  • Manage / cancel: Manage or cancel subscriptions in iOS Settings → Apple ID → Subscriptions. Deleting the app does not cancel a subscription.
  • Refunds: Refunds are handled by Apple under their refund policy at reportaproblem.apple.com. We do not process refunds directly.
  • Free trials: If offered, any unused portion of a free trial is forfeited when you purchase a subscription.
  • Price changes: We may change subscription prices. You will be notified through the App Store before any price increase takes effect and given the chance to cancel.

4. Bring-your-own-key (BYOK) and third-party AI providers

The app requires you to provide your own API key (or sign in with your own account) from a third-party AI/LLM provider such as Google AI Studio (Gemini), OpenAI, Anthropic, or a compatible provider.

  • You are responsible for all charges incurred by your use of third-party AI providers. These charges are billed directly by the provider, not by us. Subscription to the app does not include or cover AI provider usage costs.
  • You are responsible for complying with the terms of service, acceptable-use policies, and rate limits of each provider whose key or account you use.
  • We do not control the availability, accuracy, latency, content moderation, or pricing of third-party AI providers. We are not liable for provider outages, account suspensions, billing disputes, or changes to provider APIs.
  • Key security: Your API key is stored locally in the iOS Keychain. You are responsible for safeguarding your device passcode and Apple ID.

5. AI-generated content

The app generates text using third-party AI models. AI-generated content may be inaccurate, incomplete, biased, or inappropriate. You acknowledge that:

  • No professional advice. Content is provided for language-learning purposes only and is not medical, legal, financial, psychological, educational-certification, or professional advice.
  • No guarantee of accuracy. Grammar corrections, translations, and explanations may contain errors. Do not rely on the app as a sole source for exams, official communications, or translation of important documents.
  • No fluency guarantee. Use of the app does not guarantee any particular level of language proficiency or CEFR certification.
  • Your responsibility. You are responsible for evaluating the appropriateness of generated content before relying on or sharing it.

6. Acceptable use

You agree not to use the app to:

  • violate any law, regulation, or third-party right;
  • generate, store, or share content that is illegal, harmful, harassing, defamatory, sexually explicit involving minors, or that incites violence;
  • attempt to extract system prompts, jailbreak AI safeguards, or generate prohibited content;
  • interfere with the app's operation, security, or other users' access;
  • use the app to send spam or automated bulk requests beyond personal use.

7. Privacy

Our handling of personal data is described in the Privacy Policy. By using the app, you also agree to that policy.

8. Updates and changes to the app

We may release updates, add or remove features, or discontinue the app at any time. Some features may depend on third-party services that change or become unavailable. We are not obligated to maintain backwards compatibility with prior versions, AI models, or providers.

9. Termination

You may stop using the app at any time by deleting it. We may suspend or terminate your license if you breach these Terms. On termination, your right to use the app ceases; sections that by their nature should survive (disclaimers, limitation of liability, governing law) will survive.

10. Disclaimer of warranties

THE APP IS PROVIDED "AS IS" AND "AS AVAILABLE", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, ACCURACY, OR NON-INFRINGEMENT. WE DO NOT WARRANT THAT THE APP WILL BE UNINTERRUPTED, ERROR-FREE, SECURE, OR THAT AI-GENERATED CONTENT WILL BE ACCURATE OR FREE OF OFFENSIVE MATERIAL. SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OF IMPLIED WARRANTIES, SO SOME OF THE ABOVE EXCLUSIONS MAY NOT APPLY TO YOU.

11. Limitation of liability

TO THE MAXIMUM EXTENT PERMITTED BY LAW, IN NO EVENT WILL VILAVERDEAPPS OR ITS PRINCIPALS BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES, OR ANY LOSS OF PROFITS, DATA, GOODWILL, OR THIRD-PARTY AI PROVIDER CHARGES, ARISING OUT OF OR IN CONNECTION WITH YOUR USE OF THE APP, WHETHER BASED ON WARRANTY, CONTRACT, TORT, OR ANY OTHER LEGAL THEORY, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

OUR TOTAL AGGREGATE LIABILITY FOR ANY CLAIM ARISING OUT OF OR RELATING TO THE APP SHALL NOT EXCEED THE GREATER OF (A) THE AMOUNTS YOU PAID TO US FOR THE APP IN THE 12 MONTHS PRECEDING THE CLAIM, OR (B) USD 50.

Nothing in these Terms excludes or limits liability that cannot be excluded or limited under applicable law, including liability for gross negligence, wilful misconduct, or statutory consumer rights.

12. Indemnification

You agree to indemnify and hold harmless vilaverdeapps from any claims, damages, or expenses (including reasonable legal fees) arising from your misuse of the app, your violation of these Terms, your violation of any third-party AI provider's terms, or content you generate or submit through the app.

13. Apple-specific terms

  • These Terms are between you and vilaverdeapps. Apple is not a party.
  • Apple is not responsible for the app or its content. Apple has no obligation to provide maintenance or support for the app.
  • In the event of any failure of the app to conform to any applicable warranty, you may notify Apple, and Apple will refund the purchase price (if any) for the app. To the maximum extent permitted by law, Apple will have no other warranty obligation with respect to the app.
  • Apple and Apple's subsidiaries are third-party beneficiaries of these Terms and may enforce them against you.

14. Governing law and dispute resolution

These Terms are governed by the laws of the State of Connecticut, United States, without regard to its conflict-of-laws rules. The state and federal courts located in Connecticut shall have non-exclusive jurisdiction over any dispute arising out of or relating to these Terms, and you consent to the personal jurisdiction of those courts.

If you are a consumer resident outside the United States (including in the European Union, United Kingdom, or other jurisdictions with mandatory consumer-protection laws), you retain the protection of the mandatory provisions of the law of your country of residence, and may bring proceedings in the competent courts of that country where required by law.

15. Changes to these Terms

We may update these Terms to reflect product, legal, or App Store changes. The Last updated date at the top will change when we do. Continued use of the app after changes means you accept the updated Terms.

16. Contact

Questions about these Terms? Open an issue in the public repository: vilaverdeapps/patter.