Terms of Use

Last updated: April 2026

1. Scope

These terms govern the use of the iOS app "Sylph" provided by Martin Rost, c/o flexdienst – #20426, Kurt-Schumacher-Straße 76, 67663 Kaiserslautern, Germany.

2. Agreement

The app is distributed exclusively via the Apple App Store. By downloading you accept these terms and Apple's End User License Agreement.

3. Subscriptions and lifetime purchase

• Monthly: $7.99 / month (regional pricing applies via the App Store)
• Yearly: $49.99 / year
• Lifetime: $99.99 one-time
• Subscriptions include a 7-day free trial. They auto-renew unless cancelled at least 24 hours before the end of the period.
• Cancel anytime via Settings → Apple ID → Subscriptions.

4. No medical advice

Sylph is a wellness and mindfulness tool, not a medical device. The included breathing techniques do not replace medical or therapeutic treatment. Consult a physician before starting intense breathwork (e.g. Wim Hof), especially during pregnancy, with respiratory or cardiovascular conditions.

5. Availability

We aim for continuous availability but do not guarantee it. Maintenance or technical outages may occur.

6. Intellectual property

All content (code, design, text, audio, logos) is protected by copyright. Apple trademarks (App Store, Apple Watch, HealthKit, Liquid Glass) are trademarks of Apple Inc.

7. Liability

We are liable without limitation for intent and gross negligence as well as for damage to life, body, or health. Otherwise liability is limited to typical, foreseeable damage.

8. Governing law

German law applies, excluding the UN Convention on Contracts for the International Sale of Goods. Consumer protection rights of the country of residence remain unaffected.