By downloading or using N-Back (the "app"), you agree to these terms. These terms are an agreement between you and the app's developer and operator, Michał Skowron, Kraków, Poland (the "developer", "we"). If you do not agree, do not use the app. If you are not old enough to enter into a binding agreement under the law of your country, you may use the app only if a parent or legal guardian agrees to these terms on your behalf. Your use of the app is also subject to Apple's Media Services Terms and Conditions and the standard Apple licensed-application terms.
You are granted a personal, non-exclusive, non-transferable license to use the app on Apple devices that you own or control, for personal, non-commercial purposes. Except as these terms expressly allow, or to the extent applicable law permits it despite this restriction, you may not copy, modify, distribute, sell, rent, or sublicense the app or any part of it, and you may not reverse-engineer, decompile, or disassemble the app or attempt to derive its source code. This license ends automatically if you breach these terms; you can end it at any time by deleting the app.
The app offers optional paid upgrades ("N-Back Pro") as auto-renewing subscriptions and a one-time lifetime purchase.
N-Back is a game for practicing a working-memory task, provided for entertainment and personal-training purposes only. It is not a medical device and does not diagnose, treat, or prevent any condition. We make no claims that using the app improves intelligence, everyday memory, or any health outcome.
Gameplay includes brief colored screen flashes as answer feedback. You can turn these off at any time in Settings → Visual Feedback. If you are sensitive to flashing visuals, disable them, and stop using the app if you experience discomfort.
The app, including its design, code, and content, belongs to the developer and is protected by applicable law. These terms grant you no rights other than the license above.
The app is provided "as is" and "as available", without warranties of any kind, express or implied, including implied warranties of merchantability, fitness for a particular purpose, and non-infringement.
To the maximum extent permitted by law:
These limitations apply even if a remedy fails of its essential purpose. Nothing in these terms excludes or limits liability that cannot lawfully be excluded or limited — including liability for death or personal injury caused by negligence, for fraud, or for intentional or grossly negligent conduct — and nothing in these terms affects your statutory rights as a consumer.
If a third party brings a claim against the developer arising from your breach of these terms or your unlawful use of the app, you agree — to the extent permitted by the law of your country — to compensate the developer for the damages and reasonable costs directly resulting from that breach or use. This section does not limit any rights you have under mandatory consumer-protection law.
N-Back is actively developed and changes over time. We may add, change, or remove features (including Pro features), and updates may change device or iOS-version requirements. We may also discontinue the app entirely — for example, if maintaining it becomes technically or commercially unviable. Purchases unlock the app as it exists and evolves over time; section 3 describes how subscriptions can be cancelled.
These terms may be updated from time to time; changes appear on this page with a new effective date, and for material changes we will additionally give reasonable notice in the app before they take effect. Continued use of the app after a change takes effect means you accept the updated terms; if you do not agree, stop using the app and, if you have a subscription, cancel it as described in section 3.
These terms are governed by the laws of Poland, without regard to conflict-of-law rules. If you are a consumer, you additionally benefit from any provisions of the law of the country where you live that protect consumers and cannot be waived by agreement; nothing in these terms deprives you of those protections.
If you have a problem with the app, please contact us first at the email address in section 12. Before starting formal proceedings, you and the developer each agree to try in good faith to resolve the dispute informally for 30 days from the day it is first raised.
Any dispute arising out of or relating to the app or these terms shall be brought exclusively before the courts of Poland, and you and the developer each submit to the jurisdiction of those courts. This does not apply where the law of the country in which you live mandatorily entitles you, as a consumer, to bring or defend proceedings in your local courts (as it does, for example, for consumers in the European Union); nothing in this section takes away any right of forum such mandatory law gives you.
To the extent permitted by the law that applies to you, disputes will be resolved only on an individual basis: neither you nor the developer may bring or participate in a claim against the other as a plaintiff or member of a class, consolidated, or representative action. Where such a waiver is not permitted, it does not apply.
These terms, together with the Apple terms referenced in section 1, are the entire agreement between you and the developer regarding the app. If these terms conflict with Apple's applicable terms, Apple's terms control to the extent of the conflict. If any provision of these terms is found to be unenforceable, the remaining provisions remain in full force and effect, and not enforcing a provision is not a waiver of it. We may assign these terms to a successor that acquires the app or its business; your license remains personal and non-transferable as described in section 2.
Questions about these terms? Email nback.app.contact@gmail.com.