Terms of Service — Sunly

Last updated: May 8, 2026 · Version: 1.2

The German version of these Terms (Sunly_Nutzungsbedingungen_DE.md) prevails in the event of any inconsistency.

1. Provider and Scope

These Terms of Service govern the use of the mobile application Sunly (the “App”) for Android, provided by:

Marius Alexander Becker Schleusingerstraße 41 58840 Plettenberg, Germany Email: mail@mariusbecker.me

By downloading and using the App, you accept these Terms. If you disagree, please uninstall the App and do not use it.

2. Nature of the App

Sunly is a private, non-commercially operated app provided free of charge. The App serves wellness and lifestyle purposes only and is not a medical device within the meaning of Regulation (EU) 2017/745 (MDR).

3. Functionality

The App offers:

• UV index and weather tracking based on public weather APIs
• Personalized tanning plan based on your self-disclosed skin type and target tan
• Optional AI-assisted skin type estimation from a selfie
• Local push reminders for tanning routine and UV warnings
• Vitamin D window estimate
• Photo-based tanning progress tracking (locally stored)

The provider reserves the right to extend, modify or discontinue features at any time.

4. Disclaimer

4.1 Not Medical Advice

The App does not replace medical advice, diagnosis or treatment. Recommendations, UV alerts, tanning plan suggestions and SPF guidance are general wellness aids and not medical instructions.

For any health concerns or special life situations, consult a medical professional — preferably a dermatologist.

4.2 Personal Responsibility and Limits of Personalization

Use of the App and its recommendations is at your own risk. The App works with a limited set of inputs (skin type, target tan, location, UV forecast) and cannot fully account for individual factors such as how you feel on a given day, medication, skin sensitivity, reflection from snow, water or sand, and other variables.

You are responsible for:

• Judging whether the recommendations are appropriate for your individual situation
• Adequate sun protection (sunscreen, protective clothing, shade)
• Regular self-examination of your skin
• Avoiding UV exposure when you feel unwell or risk factors apply

4.3 Data Accuracy

The App uses external weather and UV data (Open-Meteo). These are forecasts and may differ from the actual situation. The provider makes no warranty of timeliness, accuracy or completeness.

4.4 AI Estimation

The AI-based skin type estimate is a statistical guess based on a photo. It is not 100 % accurate and does not replace self-observation or medical assessment. You can adjust the result manually at any time.

4.5 Availability

The App relies on external services (Google Vertex AI, Cloudflare, Sentry, Open-Meteo). If these services fail or your internet connection is unavailable, certain features may be temporarily unavailable. The provider is not liable for resulting inconvenience.

4.6 Limitation of Liability

To the extent permitted by law, the provider’s liability for damages arising from use of the App is excluded, except for:

• Intent and gross negligence
• Damage to life, body or health
• Claims under the German Product Liability Act (ProdHaftG)

4.7 Technical Requirements and Connectivity Responsibility

Certain functions of the App require an active internet connection (e.g. UV data retrieval, AI skin-type scan, crash reports). The provider is not responsible if the App fails to deliver full functionality without sufficient Wi-Fi or mobile-network coverage.

If you use the App outside of a Wi-Fi network, your contract with your mobile network provider continues to apply. You may be charged data fees and, where applicable, roaming charges by your mobile provider. By using the App you accept responsibility for such charges — including roaming charges abroad if data roaming is enabled.

If you are not the contract holder for the device on which the App runs, we assume that you have received permission from the contract holder to use the App.

The App is continually developed further; system requirements (minimum Android version, permissions) may change. Updates should be installed to keep using the App. The provider does not promise that the App will remain compatible with every Android version at all times.

4.8 Device Security and Condition

You are responsible for the security and operating condition of your device. In particular:

• No jailbreak / rooting: We strongly recommend not to root or modify your device. Such interventions can disable security mechanisms and may cause the App to malfunction.
• Battery level: If your device runs out of power during an active tanning session (empty battery), the provider cannot accept any responsibility — timer notifications will no longer fire.
• Device protection: Keep your operating system up to date and protect your device against unauthorized access (screen lock, biometric protection).

4.9 Free of Charge (No Hidden Costs)

Sunly is and remains free to use. There are:

• No in-app purchases (no premium tiers, no paid feature unlocks)
• No advertising in the App
• No subscription models
• No hidden fees or after-the-fact paywalls

If anything about this character were to change, the provider will clearly communicate it before any activation — you would never be charged without first being clearly informed and asked for active consent.

5. User Obligations

You agree to:

• Use the App only in accordance with these Terms and applicable law
• Not process harmful or unlawful content (e.g. third-party photos without their consent)
• Not reverse-engineer, decompile or modify the App without authorization
• Not run automated scripts or bots against the AI worker or UV API

6. Intellectual Property

The App, its design, code, text, graphics and trademarks (“Sunly”, logo) are protected by copyright and other intellectual property laws. Reproduction, distribution or commercial use without express written consent is prohibited.

Third-party libraries used in the App are subject to their respective open-source licenses.

7. Minimum Age

Use of the App is permitted from age 16. Persons under 16 may use the App only with the consent of a legal guardian.

8. Privacy

Handling of your data is governed by the separate Privacy Policy, available within the App under Profile → Privacy and forming an integral part of these Terms.

9. Changes to These Terms

The provider may amend these Terms in case of substantial functional changes or legal requirements. The current version is available within the App and on the Play Store.

Continued use of the App after a change constitutes acceptance of the new version.

10. Termination

You may end your use of the App at any time by uninstalling it. Uninstalling removes all locally stored data.

The provider may discontinue the App at any time for breach of these Terms or operational reasons.

11. Governing Law and Jurisdiction

These Terms are governed by German law, excluding the UN Convention on Contracts for the International Sale of Goods. Place of jurisdiction for merchants, public-law entities and special public-law assets is the provider’s registered address.

EU consumers may submit disputes to the European Commission’s online dispute resolution platform:

https://ec.europa.eu/consumers/odr

The provider is neither obliged nor willing to participate in dispute resolution proceedings before a consumer arbitration body (§ 36 VSBG).

12. Severability

If individual provisions of these Terms are or become invalid, the validity of the remaining provisions remains unaffected. The invalid provision is replaced by the applicable statutory rule.

End of Terms of Service