Terms of Service

1. Acceptance of Terms

By downloading, installing, accessing, or using the Stamina mobile application and associated web services (collectively, "Stamina", "the Service", "we", "us", or "our"), you acknowledge that you have read, understood, and agree to be bound by these Terms of Service ("Terms") and our Privacy Policy. If you do not agree to these Terms, you may not access or use Stamina.

2. Eligibility & User Accounts

To access certain features of Stamina, you must create an account. By creating an account, you represent and warrant that:

• You are at least 13 years of age (or the minimum legal age required in your jurisdiction to use online services).
• All information you submit (including age, sex, height, weight, and fitness parameters) is truthful and accurate to help ensure the best estimation models.
• You are solely responsible for maintaining the confidentiality of your login credentials and for all activities that occur under your account.

3. Motion Tracking & Calorie Burn Estimations

Stamina provides features that measure movement, including daily pedometer step tracking and active calorie expenditure estimates, leveraging your mobile device's motion hardware (such as Apple CoreMotion on iOS and Activity Recognition on Android).

• Sensor Accuracy: Motion detection, step counts, and active energy calculations rely on device-level sensors and generalized scientific algorithms. These metrics may vary based on device placement, motion patterns, and individual physiological differences.
• No Medical Reliance: Calorie and step outputs are provided as estimates for motivational and personal fitness logging only.

4. Subscriptions & In-App Purchases

Stamina may offer free core functionality alongside optional paid subscriptions or in-app purchases (e.g., Stamina Pro) that unlock premium tracking, analytics, and customization features.

• Billing & Auto-Renewal: Payment will be charged to your Apple App Store or Google Play account upon purchase confirmation. Paid subscriptions automatically renew unless auto-renew is cancelled at least 24 hours prior to the end of the current billing period.
• Account Management: Paid subscriptions auto-renew through the Apple App Store / Google Play and can be managed in device account settings. You can modify or cancel your subscription at any time by navigating to your Apple ID Account Settings (iOS) or Google Play Subscriptions (Android).
• Refunds: All purchases and refund requests are governed by the respective store policies of the Apple App Store or Google Play Store. Stamina does not directly process payments or issue monetary refunds for in-app purchases.

5. User Conduct & Prohibited Uses

You agree not to:

• Decompile, reverse-engineer, disassemble, or attempt to derive the source code of the Stamina mobile app or backend APIs.
• Use the Service for any unlawful, fraudulent, or malicious purpose.
• Interfere with, compromise, or disrupt the integrity or security of our servers and databases.
• Impersonate any person or misrepresent your affiliation with Stamina or any third party.

6. Intellectual Property Rights

All rights, titles, and interests in and to Stamina—including software, UI designs, graphics, branding, logos, icons, and text—are owned by or licensed to J Develops and are protected by applicable copyright, trademark, and intellectual property laws. We grant you a personal, revocable, non-exclusive, non-transferable license to use the app for personal, non-commercial purposes.

7. Disclaimer of Warranties

Stamina and all content, metrics, algorithms, and features are provided on an "AS IS" and "AS AVAILABLE" basis without warranties of any kind, whether express, implied, or statutory, including but not limited to fitness for a particular purpose, non-infringement, accuracy, or uninterrupted service.

8. Limitation of Liability

To the fullest extent permitted by applicable law, Stamina, its developers, affiliates, and partners shall not be liable for any direct, indirect, incidental, special, consequential, or punitive damages arising out of or related to your use of, or inability to use, the Service, including any injury, health condition, or physical harm resulting from workouts, physical exercise, or dietary choices logged in or suggested by the application.

9. Termination

We reserve the right to suspend or terminate your account and access to Stamina at our sole discretion, without prior notice, for conduct that violates these Terms or is harmful to other users, our business, or third parties. You may terminate your account at any time via the in-app profile settings.

10. Modifications to Terms

We reserve the right to modify these Terms at any time. When changes are made, we will update the "Effective Date" at the top of this document. Continued use of Stamina following the posting of revised Terms constitutes your acceptance of the changes.