Terms & Conditions
Last updated: February 26, 2026
These Terms and Conditions ("Terms") govern your access to and use of the Runfa.st mobile application and related services (collectively, the "Service") provided by Jan Zarcky ("Developer", "we", "us", or "our"). By creating an account, downloading, or using the Service, you agree to these Terms.
1. Eligibility and Acceptance
You must be at least 13 years old (or the minimum age required in your jurisdiction) to use the Service. If you use the Service on behalf of an organization, you represent that you have authority to bind that organization to these Terms.
2. Account Responsibilities
You are responsible for your account and all activity under it. You agree to:
- Provide accurate and up-to-date registration information.
- Keep your login credentials confidential and secure.
- Promptly notify us if you suspect unauthorized use of your account.
3. Service Description
Runfa.st is a fitness and run-tracking service for personal use. Features may include run tracking, progress visualization, goals, and AI-assisted coaching. We may add, modify, or remove features over time.
4. Health, Safety, Medical, and AI Disclaimer
The Service, including any AI-assisted coaching, training plans, recommendations, chat responses, insights, and other content, provides general fitness information only and is not medical advice, diagnosis, or treatment. The Service is not a substitute for advice from a physician or other qualified healthcare professional.
AI-generated content may be inaccurate, incomplete, delayed, unavailable, or not appropriate for your specific circumstances. You are solely responsible for evaluating whether any recommendation, workout, plan, or guidance is appropriate for you, and you should not rely on the Service as the sole basis for any health, medical, safety, or training decision.
Always use your own judgment and consult a physician or other qualified healthcare professional before beginning, resuming, or changing any exercise or wellness program, especially if you have any medical condition, injury, pain, dizziness, shortness of breath, chest pain, or other health concern. Stop exercising and seek medical attention immediately if you believe you may be experiencing a medical problem or injury. You assume all risks related to physical activity, training decisions, route and surface conditions, weather, equipment, and outdoor activity.
5. Device Permissions and Data Sources
To deliver core features, the Service may request access to permissions such as location and Apple HealthKit data. You can deny or revoke permissions through your device settings, but some features may not function fully without them.
6. Subscriptions, Billing, and Renewals
Some features may require a paid subscription. If you subscribe through Apple App Store or Google Play, billing and renewals are managed by that store and subject to its terms. Unless cancelled before renewal, subscriptions may renew automatically. Refunds are governed by the applicable store's policies.
7. Acceptable Use
You agree not to misuse the Service. Prohibited conduct includes:
- Violating any applicable law or regulation.
- Attempting to bypass security, access controls, or account protections.
- Interfering with or disrupting the Service or related infrastructure.
- Using bots, scrapers, or automated systems to access the Service without permission.
- Reverse engineering, decompiling, or creating unauthorized derivative works.
8. User Data and License
You retain ownership of content and workout data you submit to the Service. You grant the Developer a limited, non-exclusive, worldwide license to host, process, and use that data only as needed to operate, maintain, and improve the Service in accordance with our Privacy Policy.
9. Intellectual Property
The Service, including software, design, text, graphics, logos, and trademarks, is owned by the Developer or its licensors and protected by intellectual property laws. Except for limited rights expressly granted in these Terms, no rights are transferred to you.
10. Third-Party Services
The Service may depend on third-party products or platforms (for example app stores, mapping, authentication, or device operating systems). We are not responsible for third-party services, and their terms and privacy policies may apply separately.
11. Availability and Changes
We may change, suspend, or discontinue all or part of the Service at any time, including for maintenance, upgrades, security, or legal reasons. We do not guarantee uninterrupted or error-free operation.
12. Disclaimer of Warranties
To the maximum extent permitted by law, the Service 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. Without limiting the foregoing, we do not warrant that the Service or any AI-generated content, training plan, recommendation, metric, route, or insight will be accurate, complete, reliable, safe, effective, or suitable for your needs.
13. Limitation of Liability
To the maximum extent permitted by law, the Developer and its affiliates, officers, employees, and contractors will not be liable for any indirect, incidental, consequential, special, exemplary, or punitive damages, or any loss of profits, revenue, data, or goodwill, arising out of or related to your use of the Service.
To the maximum extent permitted by law, the Developer and its affiliates, officers, employees, and contractors will not be responsible for any injury, illness, death, medical complication, overtraining, allergic or adverse physical response, fall, collision, route hazard, or any other health, bodily, or safety outcome arising from or related to your use of the Service, your participation in any workout or activity, or your reliance on any AI-generated content, training plan, recommendation, or other information provided through the Service.
To the maximum extent permitted by law, if the Developer is found liable to you for any claim arising out of or related to the Service, the Developer's aggregate liability will not exceed the greater of the amount you paid us for the Service in the 12 months before the event giving rise to the claim or USD $100.
14. Indemnification
You agree to indemnify and hold harmless the Developer and its affiliates, officers, employees, and contractors from claims, liabilities, losses, and expenses (including reasonable legal fees) arising from your misuse of the Service, your violation of these Terms, or your violation of any rights of another person.
15. Termination
You may stop using the Service at any time. We may suspend or terminate your access if you violate these Terms or if needed to protect users, the Developer, or the Service. Provisions that by their nature should survive termination (including ownership, disclaimers, liability limits, and indemnity) will survive.
16. Governing Law and Disputes
These Terms are governed by applicable law. Disputes will be resolved in courts of competent jurisdiction unless local law requires another method. Nothing in these Terms limits rights you may have under mandatory consumer protection laws.
17. Updates to These Terms
We may revise these Terms from time to time. When we do, we will update the "Last updated" date and may provide additional notice for material changes. Continued use of the Service after changes become effective constitutes acceptance of the revised Terms.
18. Contact
If you have questions about these Terms, contact us at: