Terms & Conditions

Last updated: June 9, 2026

1. Agreement to Terms

Strength IO (the "App") is operated by Crimson IO LLC ("we," "us," "our"). By downloading, installing, or using the App, you agree to be bound by these Terms and Conditions ("Terms"). If you do not agree, do not use the App. You must be at least 13 years old to use the App.

2. Description of Service

Strength IO is a fitness application that generates personalized strength training workouts using recovery data, available equipment, and your preferences. The App integrates with Apple HealthKit to read health metrics for recovery and readiness calculations.

Strength IO is available for iPhone, with an optional Apple Watch companion, and requires a current version of iOS. The App is offered only in the regions where it is listed on the App Store.

3. Health and Fitness Disclaimer

Strength IO is not medical advice and is not a medical device. The App is intended for general fitness and informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment.

The recovery scores, readiness estimates, workout recommendations, weight suggestions, and all other information provided by the App are based on general fitness principles and data you provide or authorize through Apple HealthKit. These are estimates only. Individual results vary. The App does not diagnose any medical condition and should not be relied upon for any medical purpose.

Always consult with a qualified healthcare provider before beginning any new exercise program, particularly if you have any pre-existing medical conditions, injuries, or concerns. If you experience pain, dizziness, shortness of breath, or any other concerning symptoms during exercise, stop immediately and seek medical attention.

4. Assumption of Risk

Physical exercise involves inherent and significant risks, including the risk of serious bodily injury or death.

By using Strength IO, you acknowledge that you are voluntarily participating in physical activities and you knowingly and freely assume all risks associated with such activities, whether known or unknown, including risks that may result from the negligence of Crimson IO LLC or its developers.

You are solely responsible for determining whether any workout, exercise, weight, or intensity level is appropriate for your physical condition and fitness level. Strength IO provides recommendations based on algorithms and data — it cannot assess your individual physical limitations, medical history, or current state of health.

5. Disclaimer of Warranties

THE APP IS PROVIDED "AS IS" AND "AS AVAILABLE" WITHOUT WARRANTIES OF ANY KIND, EITHER EXPRESS OR IMPLIED. To the fullest extent permitted by applicable law, Crimson IO LLC disclaims all warranties, including but not limited to implied warranties of merchantability, fitness for a particular purpose, accuracy, and non-infringement.

We do not warrant that the App will be uninterrupted, error-free, or free of harmful components, or that any content or data (including recovery scores, workout recommendations, or weight suggestions) will be accurate, reliable, or complete. You use the App at your sole risk.

6. Limitation of Liability

To the maximum extent permitted by applicable law, Crimson IO LLC, its developers, officers, affiliates, and agents shall not be liable for any indirect, incidental, special, consequential, or punitive damages, including but not limited to personal injury, death, loss of data, loss of profits, or other intangible losses, arising out of or related to your use of or inability to use the App.

In no event shall our total aggregate liability to you for all claims arising out of or related to these Terms or your use of the App exceed the amount you paid for the App in the twelve (12) months immediately preceding the event giving rise to the claim, or one hundred dollars ($100), whichever is greater.

Some jurisdictions do not allow the exclusion or limitation of certain damages. In such jurisdictions, our liability shall be limited to the fullest extent permitted by law.

7. Indemnification

You agree to defend, indemnify, and hold harmless Crimson IO LLC, its developers, officers, affiliates, and agents from and against any claims, liabilities, damages, losses, costs, and expenses (including reasonable attorney's fees) arising out of or related to: (a) your use of the App; (b) your violation of these Terms; (c) your violation of any third-party rights; or (d) any injury, harm, or damage arising from physical activities performed in connection with using the App.

8. Subscriptions and Payments

Strength IO offers subscription plans managed entirely through Apple's App Store. By purchasing a subscription:

Payment is charged to your Apple ID account at confirmation of purchase
Subscriptions automatically renew unless canceled at least 24 hours before the end of the current period
Your account will be charged for renewal within 24 hours prior to the end of the current period at the then-current subscription rate
Free trials automatically convert to paid subscriptions unless canceled before the trial ends
You can manage and cancel subscriptions in your Apple ID account settings

Refund requests are handled by Apple in accordance with their refund policies. We do not process payments or refunds directly.

9. User Data and Content

You retain ownership of the data you create within the App (workouts, logs, preferences, etc.). By using the App, you grant Crimson IO LLC a limited license to process, store, and display your data solely for the purpose of providing and improving the App's functionality. We do not sell your data or share it with any third-party AI service.

10. Account Responsibility

You are responsible for maintaining the security of your Apple ID and any activity that occurs under your account. Crimson IO LLC is not liable for any loss or damage resulting from unauthorized access to your account.

11. Acceptable Use

You agree to use Strength IO only for its intended purpose as a fitness tracking and workout generation tool. You agree not to:

Reverse engineer, decompile, or disassemble the App
Use the App for any unlawful purpose
Redistribute, sell, or sublicense the App
Remove any copyright or proprietary notices from the App
Interfere with or disrupt the App's functionality

12. Intellectual Property

The Strength IO app and all associated content, features, and functionality are owned by Crimson IO LLC and protected by copyright, trademark, and other intellectual property laws. The App is licensed, not sold, to you for personal, non-commercial use.

13. Third-Party Services

Strength IO integrates with Apple services including HealthKit, Sign In with Apple, and StoreKit. Your use of these services is governed by Apple's terms and conditions. We are not responsible for the availability, accuracy, or functionality of any third-party services.

The App is licensed to you under these Terms and Apple's standard Licensed Application End User License Agreement (EULA). In the event of any conflict between these Terms and Apple's EULA, these Terms shall govern to the extent permitted by law. Apple has no obligation to provide maintenance, support, or warranty for the App, and is not responsible for addressing any claims relating to the App. Apple and its subsidiaries are third-party beneficiaries of these Terms and, upon your acceptance, have the right to enforce these Terms against you.

14. Dispute Resolution

Please read this section carefully. It affects your legal rights.

You and Crimson IO LLC agree that any dispute arising out of or related to these Terms or your use of the App shall first be resolved through good-faith informal negotiation. Contact us at StrengthIO@crimson-io.com with a description of the dispute. We will attempt to resolve it within 30 days.

Class action waiver: You agree that any dispute resolution proceedings will be conducted only on an individual basis, and not as a class, consolidated, or representative action. You waive any right to participate in a class action lawsuit or class-wide arbitration against Crimson IO LLC.

15. Termination

You may stop using Strength IO at any time by deleting the App. We reserve the right to terminate or suspend your access at our sole discretion, without notice, for conduct that we believe violates these Terms or is harmful to other users or the App. Sections 3 through 7 and 14 shall survive any termination of these Terms.

16. Modifications to Terms

We may update these Terms from time to time. When we do, we will revise the "Last updated" date at the top of this page. Your continued use of the App after any changes constitutes acceptance of the updated Terms.

17. Governing Law

These Terms shall be governed by and construed in accordance with the laws of the State of Georgia, without regard to its conflict of law provisions. Any legal action arising under these Terms shall be brought exclusively in the state or federal courts located in Georgia, and you consent to the jurisdiction of such courts.

18. General Provisions

Severability: If any provision of these Terms is found to be unenforceable, the remaining provisions shall continue in full force and effect.

Entire Agreement: These Terms, together with the Privacy Policy, constitute the entire agreement between you and Crimson IO LLC regarding your use of the App and supersede all prior agreements.

Waiver: Our failure to enforce any right or provision of these Terms shall not constitute a waiver of that right or provision.

Assignment: We may assign our rights and obligations under these Terms without your consent. You may not assign your rights or obligations without our prior written consent.

19. Contact

Questions about these Terms? Contact us at StrengthIO@crimson-io.com.