Back to home

Terms of Use

Last updated: 24 May 2026

Important: These Terms of Use constitute a legally binding agreement. Please read them carefully before using the Tonnage app.

1. Acceptance of Terms

1.1. These Terms of Use ("Terms") govern your access to and use of the Tonnage mobile application ("App" or "Service"), available on iOS and Android platforms.

1.2. The App is provided by an independent individual developer ("Developer", "we", "us", or "our") based in Poland, European Union. Contact: contact@uynix.com

1.3. By downloading, installing, creating an account, logging in, or otherwise accessing any feature of the App, you ("User" or "you") confirm that you have read, understood, and agree to be bound by these Terms in full.

1.4. If you do not agree to these Terms, you are not permitted to use the App and must immediately cease using it and uninstall it from your device.

1.5. These Terms, together with our Privacy Policy, constitute the entire agreement between you and the Developer regarding your use of the App. Any prior representations, communications, or agreements not expressly incorporated herein have no binding effect.

2. Description of the Service

2.1. Tonnage is a mobile strength training tracker and analytics app. The App enables you to:

  • Log workout sessions (exercises, sets, weight, repetitions, session notes);
  • Create and manage custom training routines;
  • Receive AI-generated workout suggestions personalized to your training data;
  • Attach progress photos to workout sessions;
  • Track muscle imbalances, recovery status, and training volume trends;
  • View personal records, muscle activation patterns, and performance analytics;
  • Browse an integrated exercise library.

2.2. Some features are available free of charge. Access to advanced analytics and training features requires a paid Premium Subscription, as described in Section 7.

2.3. The Developer reserves the right to modify, expand, or discontinue features at any time, subject to Section 13 of these Terms.

3. Eligibility

3.1. Minimum age. You must be at least 16 years old to use the App. This requirement reflects the age threshold established under the EU General Data Protection Regulation (GDPR), Art. 8, for information society services. In jurisdictions where a higher minimum age applies under local law, that higher age applies to users in that jurisdiction.

3.2. By registering an account or using the App, you represent and warrant that you meet the minimum age requirement.

3.3. If the Developer becomes aware that an account has been created by a person below the minimum age, the account will be suspended or deleted promptly and all associated data will be removed in accordance with the Privacy Policy.

3.4. Legal capacity. You represent that you have the legal capacity to enter into a binding agreement under the laws applicable to you, or that you have obtained the required parental or guardian consent where required.

3.5. Lawful use. You agree to use the App only for lawful purposes and in compliance with all applicable local, national, and international laws and regulations.

4. User Account

4.1. Registration

You may create an account using:

  • An email address and password; or
  • A Google account (via Google OAuth 2.0).

You agree to provide accurate, complete, and current information when creating and maintaining your account.

4.2. Account Security

4.2.1. You are responsible for maintaining the confidentiality of your account credentials and for all activities that occur under your account.

4.2.2. You agree to notify the Developer immediately at contact@tonnage.app of any unauthorized use of your account or any other security breach.

4.2.3. The Developer is not liable for any loss or damage arising from unauthorized access to your account, unless directly caused by our negligence.

4.3. One Account Per User

Each user may maintain only one active account. Creating multiple accounts to circumvent limitations or these Terms is prohibited.

4.4. Password Reset

You may reset your password at any time using the in-app password reset function. A reset link will be sent to the email address associated with your account.

4.5. Account Deletion

You may delete your account at any time through the App (Profile → Settings → Delete Account). Deletion results in permanent removal of your data as described in the Privacy Policy. Deleting your account does not entitle you to a refund for any active Premium Subscription.

5. License to Use the App

5.1. Grant of License

Subject to your compliance with these Terms, the Developer grants you a limited, non-exclusive, non-transferable, revocable license to:

  • Download and install the App on a mobile device owned or controlled by you;
  • Use the App solely for your personal, non-commercial strength training purposes.

5.2. License Restrictions

The license in Section 5.1 does not include the right to:

(a) copy, modify, create derivative works of, decompile, disassemble, or reverse-engineer any part of the App;

(b) remove or alter any proprietary notices (including copyright and trademark notices) contained in the App;

(c) sublicense, sell, resell, transfer, assign, or otherwise exploit the App commercially;

(d) use the App to provide services to third parties (e.g., as a tool for personal training clients) without prior written consent from the Developer;

(e) use automated tools (bots, scrapers, spiders) to access the App or its data;

(f) use the App in any manner inconsistent with its intended purpose or these Terms.

5.3. Ownership

All rights in the App not expressly granted under these Terms are reserved by the Developer. These Terms do not transfer any intellectual property rights in the App to you.

6. User-Generated Content

6.1. Definition

"User Content" means any data you submit to the App, including but not limited to: training data (exercises, sets, weights, reps, session notes), progress photos, and profile information.

6.2. Ownership of Your Content

You retain full ownership of your User Content. The Developer makes no claim of ownership over data you enter into the App.

6.3. License to Process

You grant the Developer a limited, non-exclusive, worldwide, royalty-free license to store, process, and display your User Content solely to the extent necessary to provide the App's services. This license terminates upon account deletion or data removal, as described in the Privacy Policy.

6.4. Progress Photos

Photos you upload are stored on Supabase servers (USA) in encrypted form. By uploading photos, you confirm you have the right to do so and that the content does not infringe third-party rights. Data transfers to the USA are covered by the Standard Contractual Clauses described in the Privacy Policy.

6.5. Prohibited Content

You agree not to submit any content that:

  • is unlawful, defamatory, obscene, or infringes third-party rights;
  • contains malware or code intended to damage the App or its infrastructure;
  • violates intellectual property rights of any third party.

7. Premium Subscription, Billing, and Cancellation

7.1. Premium Subscription

Tonnage offers a premium subscription plan (product ID: tonnage_premium) available as:

  • Monthly subscription;
  • Annual subscription.

The Premium Subscription unlocks access to advanced analytics and training features within the App.

7.2. Free Trial

New users may be offered a free trial period for the Premium Subscription. The duration of the trial is displayed in the App or in the relevant app store listing at the time of sign-up. Unless you cancel before the end of the trial period, your subscription will automatically convert to a paid subscription at the conclusion of the trial.

7.3. Billing

7.3.1. All payments for the Premium Subscription are processed exclusively through:

  • Apple App Store (iOS) — subject to Apple Inc.'s terms and conditions;
  • Google Play Store (Android) — subject to Google LLC's terms and conditions.

7.3.2. The Developer does not have access to your payment details (credit card numbers, banking information). All transactions are processed by Apple or Google.

7.3.3. Pricing is displayed prior to purchase and may vary by country or currency.

7.4. Automatic Renewal

Your subscription will automatically renew at the end of each billing period (monthly or annual) unless you disable auto-renewal at least 24 hours before the end of the current period. The renewal charge is applied to your account within 24 hours before the current period ends.

7.5. Cancellation

7.5.1. Subscriptions can only be cancelled through:

  • Android: Google Play → Profile → Payments & Subscriptions → Subscriptions.

7.5.2. The Developer does not have the technical ability to cancel subscriptions on your behalf.

7.5.3. Upon cancellation, you retain access to Premium features until the end of the current paid billing period.

7.6. Refunds

Refund eligibility is governed solely by Google Play Store policies. The Developer is not a party to billing transactions and does not process refunds directly. For billing disputes, contact Apple or Google directly.

EU consumers: Your statutory rights under applicable EU and national consumer protection laws are not affected by these Terms, including any mandatory rights to withdrawal or refund under Directive 2011/83/EU or applicable national laws.

7.7. Price Changes

The Developer may change subscription pricing with reasonable prior notice via email or an in-app notification. Continued use of the Premium Subscription after a price change takes effect constitutes acceptance of the new pricing.

8. Prohibited Uses

You agree not to use the App:

8.1. in any way that violates applicable local, national, or international law or regulation;

8.2. to infringe or misappropriate intellectual property or other rights of any third party;

8.3. to transmit or distribute malware, viruses, trojans, worms, logic bombs, or any other harmful or malicious code;

8.4. to attempt unauthorized access to the Developer's systems, servers, or databases connected to the App;

8.5. to reverse-engineer, decompile, or disassemble any component of the App;

8.6. to use automated scraping tools to bulk-extract data from the App;

8.7. to circumvent, bypass, or interfere with any security, authentication, or access control mechanism of the App;

8.8. to impersonate any person or entity, or misrepresent your identity;

8.9. to disrupt or interfere with the App's operation or the infrastructure on which it depends;

8.10. for commercial purposes without prior written consent from the Developer.

9. AI-Generated Workout Suggestions — Disclaimer

9.1. How AI Suggestions Work

The App uses an AI system (provider: Groq, Inc.; model: Llama 3.3 70B) to generate personalized workout suggestions based on your training archetypes, detected muscle imbalances, and stated fitness goals.

9.2. Not Medical Advice

Workout suggestions generated by Tonnage — including exercise recommendations, intensity, volume, and recovery guidance — are provided for informational and educational purposes only. They do not constitute medical advice, diagnosis, or treatment.

The App does not establish a patient-physician relationship. Nothing in the App should be construed as a substitute for professional medical advice from a qualified healthcare provider.

9.3. Consult a Healthcare Professional

Before starting any exercise program, particularly if you:

  • are new to physical exercise or returning after a period of inactivity;
  • have any medical conditions, injuries, or health concerns;
  • are taking medications that may affect your physical capacity;

you should consult a licensed physician, physiotherapist, or other qualified healthcare professional.

9.4. Limitations of AI Systems

You acknowledge that:

(a) AI systems may produce inaccurate, incomplete, or unsuitable suggestions;

(b) AI suggestions do not account for your complete medical history;

(c) the Developer does not guarantee the suitability of AI suggestions for your individual circumstances;

(d) you use AI-generated suggestions entirely at your own risk.

9.5. Assumption of Risk

The Developer is not liable for any injury, health condition, or other harm arising directly or indirectly from following training suggestions or plans generated by the App.

10. Intellectual Property

10.1. Developer's Rights

The Tonnage App, including its name, logo, user interface, source code, architecture, databases, algorithms, documentation, and all other materials comprising the App, are the intellectual property of the Developer and are protected by copyright, trademark, and other intellectual property laws in Poland and internationally.

10.2. Trademarks

The name "Tonnage" and the App logo are trademarks or unregistered marks of the Developer. You may not use them without prior written consent.

10.3. Third-Party Content

The App integrates exercise data from ExerciseDB API. Rights to that content belong to their respective owners and are subject to separate licensing terms.

10.4. Feedback

If you submit feedback, suggestions, or ideas to the Developer, the Developer may use them without any obligation to you and without compensation.

11. Disclaimers and Warranties

11.1. No Warranties

The App is provided "as is" and "as available" without warranties of any kind — express, implied, or statutory. To the fullest extent permitted by applicable law, the Developer disclaims all warranties, including but not limited to:

  • implied warranties of merchantability, fitness for a particular purpose;
  • warranties of non-infringement;
  • warranties that the App will be uninterrupted, timely, secure, or error-free.

11.2. Service Availability

The Developer does not guarantee uninterrupted access to the App. Access may be suspended due to maintenance, updates, technical failures, or circumstances beyond our control (including third-party service outages).

11.3. Accuracy of Analytics

Analytics data presented in the App (muscle imbalance, recovery metrics, volume trends) are calculated based on data you provide and are approximate. They do not replace professional coaching or medical evaluation.

11.4. Third-Party Services

The App relies on third-party services (including Supabase, PostHog, Groq, and Google). The Developer is not responsible for outages, errors, or data processing by those services under their own terms and policies.

12. Limitation of Liability

12.1. Exclusion of Indirect Damages

To the fullest extent permitted by applicable law, the Developer shall not be liable for any indirect, incidental, special, consequential, or punitive damages, including but not limited to: loss of data, loss of profits, loss of goodwill, personal injury, medical costs, or any other losses arising from your use of or inability to use the App — even if the Developer was advised of the possibility of such damages.

12.2. Cap on Direct Liability

To the extent liability cannot be excluded under applicable law, the Developer's total aggregate liability to you for any claims relating to your use of the App is limited to the greater of: (a) the amount you paid for a Premium Subscription in the twelve (12) months preceding the event giving rise to the claim; or (b) EUR 50.

12.3. Consumer Rights Preserved

Nothing in these Terms limits or excludes any rights you may have under applicable mandatory consumer protection laws that cannot be waived by contract, including but not limited to rights under EU Directive 2011/83/EU, the Australian Consumer Law, or equivalent mandatory national laws in your jurisdiction.

13. Modifications to Terms

13.1. The Developer may update these Terms at any time. For material changes, you will be notified at least 14 days before the changes take effect via:

  • an in-app push notification;
  • an email to the address associated with your account; or
  • a prominent notice displayed on next app launch.

13.2. If you do not accept the updated Terms, you should cease using the App and may delete your account before the effective date.

13.3. Continued use of the App after the effective date of changes constitutes acceptance of the updated Terms.

13.4. Minor changes (technical corrections, editorial updates, clarifications that do not materially affect your rights) may be made without prior notice and take effect immediately.

14. Suspension and Termination

14.1. Termination by the Developer

The Developer may suspend or terminate your access to the App, in whole or in part, if:

(a) you breach these Terms;

(b) the Developer has reasonable grounds to suspect illegal activity;

(c) required by applicable law or court order;

(d) your account shows signs of unauthorized access or security compromise.

Where feasible, the Developer will provide advance notice — unless doing so is precluded by security concerns or legal requirements.

14.2. Effect of Termination

Upon termination: the license granted in Section 5 expires, your access to the App and your data ends, and data is deleted per the Privacy Policy. Provisions that by their nature should survive termination (including Sections 10, 11, 12) remain in effect.

15. Governing Law and Dispute Resolution

15.1. These Terms are governed by and construed in accordance with the laws of Poland and, where applicable, the law of the European Union, excluding conflict-of-law rules that would require application of another jurisdiction's laws.

15.2. The parties agree to attempt to resolve any dispute arising from these Terms amicably within 30 days of written notice from either party.

15.3. If amicable resolution fails, disputes shall be submitted to the competent courts of Poland.

15.4. EU consumers. These Terms do not limit or exclude any mandatory rights of consumers under the law of their EU member state of residence. EU consumers may also use the European Commission's Online Dispute Resolution (ODR) platform at: https://ec.europa.eu/consumers/odr/

15.5. Other jurisdictions. Users outside the EU have access to dispute resolution mechanisms available under their applicable local laws. Nothing in these Terms limits mandatory statutory rights under local law.

16. General Provisions

16.1. Severability. If any provision of these Terms is found invalid or unenforceable, the remaining provisions continue in full force.

16.2. No Waiver. Failure by the Developer to enforce any right or provision of these Terms does not constitute a waiver of that right or provision.

16.3. Entire Agreement. These Terms, together with the Privacy Policy, constitute the entire agreement between you and the Developer regarding your use of the App.

16.4. Assignment. The Developer may assign its rights and obligations under these Terms to a third party (e.g., in connection with a project transfer or business reorganization), subject to applicable data protection obligations. You may not assign your rights under these Terms without prior written consent from the Developer.

16.5. Language. These Terms are provided in English. In the event of any conflict between an English version and a translated version, the English version prevails.

17. Contact

For questions, concerns, or notices relating to these Terms:

Email: contact@uynix.com

The Developer will endeavor to respond within 14 business days.

This document is provided for informational purposes. Consult a qualified attorney for legal advice tailored to your specific situation.

Version: 1.0 | Date: May 24, 2026