Terms of Use

These Terms govern your use of the N·Back app (“the App”), published by Niclas Wächter (“we,” “us,” “our”). By installing or using the App, you agree to these Terms.

1. License

Subject to these Terms and the Apple Media Services Terms, we grant you a personal, non-transferable, non-exclusive license to use the App on Apple-branded devices that you own or control. You may not copy, modify, reverse-engineer, decompile, or redistribute the App, except as permitted by applicable law.

2. Subscriptions and purchases

The App offers a seven-day free trial, recurring subscriptions, and a one-time lifetime purchase. All purchases are handled by Apple. The following applies:

• Free trial. The first seven days unlock all features. No charge is made during the trial.
• Auto-renewing subscriptions. Monthly and annual subscriptions renew automatically at the end of each period unless you cancel at least 24 hours before renewal. Your Apple ID will be charged at confirmation of purchase.
• Managing or canceling. You can manage or cancel a subscription at any time in Settings → [your Apple ID] → Subscriptions on your iPhone. Cancellation takes effect at the end of the current billing period.
• Lifetime purchase. A one-time, non-consumable purchase that unlocks all features available at the time of purchase. We will not retroactively gate features that were unlocked when you purchased.
• Refunds. All purchases are processed by Apple. To request a refund, contact Apple Support.
• Price changes. If we change the price of a recurring subscription, Apple will notify you and request your consent before the next renewal.

3. Health and cognition disclaimer

The App is intended for general working-memory practice and personal interest only. It is not a medical device. It does not diagnose, treat, cure, or prevent any disease or condition. Research on dual n-back transfer effects is mixed and results vary between individuals. Do not rely on the App as a substitute for professional medical advice. If you have concerns about cognitive function, consult a qualified healthcare provider.

4. Acceptable use

You agree not to use the App in any unlawful way, to attempt to gain unauthorized access to it, or to interfere with its operation.

5. Intellectual property

The App, its design, source code, audio assets, and branding are owned by us and protected by copyright and other intellectual-property laws. These Terms do not grant you ownership of anything in the App.

6. No warranty

The App is provided “as is” and “as available” without warranty of any kind, whether express, implied, or statutory, including without limitation any implied warranty of merchantability, fitness for a particular purpose, or non-infringement. We do not guarantee that the App will be uninterrupted, error-free, or produce any particular cognitive outcome.

7. Limitation of liability

To the maximum extent permitted by applicable law, in no event will we be liable for any indirect, incidental, special, consequential, or punitive damages, or any loss of data or profits, arising out of or relating to your use of the App. Our total aggregate liability for any claim relating to the App will not exceed the amount you paid us for the App in the twelve (12) months preceding the claim, or USD $50, whichever is greater.

8. Privacy

Our Privacy Policy explains how data is handled. In short: we collect nothing.

9. Changes to these Terms

We may update these Terms from time to time. The “Last updated” date at the top of this page reflects the most recent change. Material changes will be noted in the App’s release notes. Your continued use of the App after a change constitutes acceptance of the updated Terms.

10. Termination

You may stop using the App at any time by deleting it. We may suspend or terminate access if you materially breach these Terms. Sections that by their nature should survive termination (including limitations of liability, intellectual property, and governing law) will survive.

11. Governing law

These Terms are governed by the laws of Germany, without regard to its conflict-of-laws provisions. Any dispute will be resolved in the competent courts of Hannover, Germany, unless mandatory consumer-protection law in your country of residence requires otherwise.

12. Apple-specific terms

You acknowledge that these Terms are between you and us, not with Apple, and that Apple is not responsible for the App or its content. Apple has no obligation to provide support for the App. Apple and its subsidiaries are third-party beneficiaries of these Terms and may enforce them against you. This agreement does not replace the Apple Standard EULA, which also applies to your use of the App.

13. Contact

Questions about these Terms: support@lumoraworks.app