Terms of Use

Last updated: September 30, 2026
Effective date: September 30, 2026

1. Introduction & Acceptance

These Terms of Use (“Terms”) govern your access to and use of the Numbio mobile application (“App”), operated by Peter Schmidt, an individual developer based in Germany (“Developer”, “we”, “us”, “our”).

Numbio is a mental math training application that helps users practice arithmetic skills through exercises, games, challenges, and AI-powered coaching.

By downloading, installing, accessing, or using the App, you agree to be bound by these Terms. If you do not agree to these Terms, do not use the App.

These Terms supplement the Apple Standard End User License Agreement (“Apple EULA”), which also applies to your use of the App. In the event of a conflict between these Terms and the Apple EULA, the Apple EULA shall govern to the extent required by Apple’s policies.

2. Definitions

  • “App” means the Numbio mobile application, including all updates, upgrades, and new versions.

  • “Services” means all features, functionality, and Content provided through the App.

  • “Content” means all text, graphics, images, audio, data, exercises, tips, and other materials available through the App.

  • “User” or “you” means any individual who accesses or uses the App.

  • “Numbio Pro” means the premium features of the App, offered as an auto-renewing subscription (“Subscription”) or as a one-time purchase.

  • “User Content” means any content, data, or materials created or submitted by users through the App, including custom training configurations.

  • “AI Features” means features powered by artificial intelligence, including the AI Coach.

3. Eligibility

Numbio can be used by learners of all ages. If the learner is below the age of digital consent in their country, a parent or legal guardian must set up and manage the App for them.

If a parent or legal guardian sets up the App for a child, the parent or guardian agrees to these Terms, accepts full responsibility for the child’s use of the App, and confirms that they have the legal authority to provide consent for data processing on the child’s behalf.

4. Account Registration

To access certain features, you may create an account using an email address, Sign in with Apple, or Google Sign-In, or you may use the App anonymously.

You agree to:

  • Provide accurate, current, and complete information during registration.

  • Maintain and update your information to keep it accurate and complete.

  • Keep your account credentials secure and confidential.

  • Notify us immediately of any unauthorized use of your account.

You are responsible for all activity that occurs under your account.

Anonymous accounts have limited functionality and cannot be recovered if access is lost.

5. License & Use

Subject to your compliance with these Terms, we grant you a limited, non-exclusive, non-transferable, revocable license to download, install, and use the App on Apple devices that you own or control, for personal, non-commercial purposes.

This license is in addition to, and governed by, the Apple Standard EULA.

You may not:

  • Copy, modify, distribute, sell, lease, sublicense, or create derivative works of the App or its Content.

  • Reverse engineer, decompile, disassemble, or attempt to derive the source code of the App.

  • Scrape, crawl, or use automated means to extract data or Content from the App.

  • Use the App for any unlawful, harmful, or fraudulent purpose.

  • Interfere with or disrupt the integrity or performance of the App or its servers.

  • Circumvent, disable, or otherwise interfere with security-related features of the App.

  • Impersonate any person or entity or misrepresent your affiliation with any person or entity.

  • Use the App to develop a competing product or service.

  • Remove, alter, or obscure any proprietary notices, labels, or marks on the App.

6. Subscriptions & Payments

6.1 Numbio Pro

Numbio Pro may be offered as an auto-renewing Subscription or as a one-time Lifetime purchase. Options and prices are shown in the App. A Lifetime purchase gives access to Numbio Pro for as long as we offer the App. Where Family Sharing is available, Numbio Pro can be shared with your family group.

6.2 Purchases Through Apple

In-app purchases are sold through the App Store. Depending on your country, Apple sells them either as our agent or in its own name on our behalf. Payment, taxes, auto-renewal, free trials, cancellation, refunds, price changes, and any statutory right of withdrawal are handled by Apple under the Apple Media Services Terms and Conditions. Your license to use the App and Numbio Pro, and your use of our Services, are between you and us under these Terms and the Apple Standard EULA.

6.3 Managing Your Subscription

Subscriptions renew automatically until you cancel them in your Apple Account settings. Deleting the App or your account does not cancel a Subscription.

7. AI-Powered Features

7.1 AI Features

Numbio includes features powered by Google AI (Gemini), such as the AI Coach. These features provide personalized math tips, explanations, exercises, and encouragement based on your activity.

7.2 Accuracy & Limitations

AI-generated content is provided for informational and entertainment purposes only. AI outputs:

  • May not always be accurate, complete, or up to date.

  • Should not be relied upon as the sole basis for educational, cognitive, or academic decisions.

  • Are generated algorithmically and do not constitute professional advice of any kind.

7.3 No Guarantees

We do not guarantee the accuracy, reliability, or suitability of any AI-generated content. You use AI Features at your own discretion and risk.

7.4 Data Processing

Data processed by AI Features is handled in accordance with our Privacy Policy and Google’s applicable terms and policies.

8. User Content & Feedback

8.1 User Content

You may create custom training configurations and other limited User Content within the App. You retain ownership of your User Content, but grant us a non-exclusive, worldwide, royalty-free license to use, store, and process your User Content solely for the purpose of providing and improving the Services.

8.2 Feedback

If you send us feedback or suggestions, you allow us to use them to improve the App.

9. Intellectual Property

All Content, features, functionality, design, trademarks, trade names, logos, graphics, and other intellectual property associated with the App are and remain the exclusive property of the Developer or its licensors.

Nothing in these Terms transfers any intellectual property rights to you, except for the limited license granted in Section 5.

10. Educational Disclaimer

Numbio is a recreational math practice application. Numbio is not an educational institution or a certified learning platform.

We make no representations, warranties, or guarantees that use of the App will:

  • Improve your mathematical ability, cognitive function, or mental performance.

  • Lead to specific academic results, test scores, or educational outcomes.

  • Serve as a substitute for formal education, tutoring, or professional instruction.

The exercises, statistics, and performance data provided by the App are for recreational and self-tracking purposes and should not be interpreted as professional assessments.

11. Third-Party Services

The App relies on third-party services, for example from Apple, Google, and RevenueCat, which are governed by their own terms.

12. Privacy

How we collect and use personal data is described in our Privacy Policy at numbio.com/privacy.

13. Limitation of Liability

13.1 Mandatory Liability Under German Law

Nothing in these Terms shall limit or exclude liability for:

  • Damages caused by intent (Vorsatz) or gross negligence (grobe Fahrlässigkeit).

  • Injury to life, body, or health (Verletzung des Lebens, des Körpers oder der Gesundheit).

  • Liability under the German Product Liability Act (Produkthaftungsgesetz).

  • Any other liability that cannot be limited or excluded under applicable mandatory law.

13.2 Essential Contractual Obligations

In cases of slight negligence (einfache Fahrlässigkeit), liability is limited to breaches of essential contractual obligations (wesentliche Vertragspflichten / Kardinalpflichten), and in such cases, liability shall be limited to foreseeable, typically occurring damages.

14. Termination & Account Deletion

14.1 Termination by Developer

We may suspend or terminate your account if you materially breach these Terms or where the law requires it. If you have an active paid plan and we end your access for any other reason, we will give you at least 30 days’ notice.

14.2 Termination by User

You may terminate your account at any time by using the account deletion feature within the App.

14.3 Effects of Account Deletion

Account deletion is permanent and irreversible. Upon deletion:

  • We delete your account data from our servers.

  • Your progress, statistics, and User Content will be permanently lost.

  • Our service providers may keep some data under their own retention policies, and we may keep data that no longer identifies you directly, such as scores used for app-wide statistics.

14.4 Subscriptions After Termination

Important: Deleting your account or having your account terminated does not automatically cancel your Subscription. You must manage and cancel your Subscription through the App Store to avoid continued billing.

14.5 Surviving Provisions

Sections 8.2 (Feedback), 9 (Intellectual Property), 10 (Educational Disclaimer), 13 (Limitation of Liability), 17 (Governing Law & Jurisdiction), and this Section 14.5 survive termination of these Terms.

15. Modifications to Terms

We may change these Terms for valid reasons, such as new features, changes in the law, or security. We will tell you about material changes in the App or by email at least 30 days before they take effect. If you do not agree, you can delete your account before then. Changes to the core features of a paid plan you have already bought require your consent.

We encourage you to review these Terms periodically.

16. Modifications to App

We may modify, update, suspend, or discontinue any part of the App or its features.

We are not obligated to maintain, support, or update the App or to provide any specific features or content. Nothing in this section limits your rights as a consumer under mandatory law.

17. Governing Law & Jurisdiction

17.1 Governing Law

These Terms are governed by and construed in accordance with the laws of the Federal Republic of Germany, excluding its conflict of laws provisions and excluding the United Nations Convention on Contracts for the International Sale of Goods (UN CISG).

17.2 Jurisdiction

If you are a merchant, a legal entity under public law, or have no general place of jurisdiction in Germany, the courts of Münster, Germany, have exclusive jurisdiction. For consumers, the statutory rules on jurisdiction apply.

17.3 EU Consumer Rights

If you are a consumer residing in the European Union, nothing in this section shall deprive you of the protection afforded by the mandatory provisions of the law of your country of habitual residence, or of your right to bring proceedings in the courts of that country, as guaranteed under Regulation (EU) No 1215/2012 (Brussels I Regulation).

17.4 No Arbitration

We do not require arbitration. All disputes shall be resolved exclusively through the courts as described above.

18. Severability

If any provision of these Terms is held to be invalid, illegal, or unenforceable, the other provisions remain in full force and effect.

19. Entire Agreement

These Terms, together with the Apple Standard EULA, constitute the entire agreement between you and the Developer regarding your use of the App.

20. Contact Information

If you have questions about these Terms, please contact us:

Peter Schmidt
c/o POSTFLEX PFX-240-632
Emsdettener Str. 10
48268 Greven
Germany

Email: hello@numbio.com