Terms of Service

By downloading, installing, or using the Muscle Diary mobile application ("App") or website ("Service"), you agree to be bound by these Terms of Service ("Terms"). If you do not agree, do not use the Service.

These Terms constitute a legally binding agreement between you and Muscle Diary ("we", "us", "our").

Muscle Diary is a fitness tracking application that allows you to:

• Log workouts and exercises, including sets, reps, weights, duration, and distance
• Scan QR codes on gym equipment to quickly start a logging session for that equipment
• View workout history, personal records, and progress over time
• Create and follow custom routines
• Sync your data across devices

The App works offline. Data entered without a connection is stored locally and synced automatically when you are back online.

You must be at least 16 years old to use the Service. By using the Service you confirm that you meet this requirement. We do not knowingly allow accounts for persons under 16.

4.1 Account Creation

To use the Service you must create an account. You agree to:

• Provide accurate and complete information during registration
• Keep your account credentials secure and not share them with others
• Notify us immediately if you suspect unauthorised access to your account
• Be responsible for all activity that occurs under your account

4.2 One Account Per Person

You may create one account for your personal use. Creating multiple accounts to circumvent restrictions or for abusive purposes is not permitted.

4.3 Account Deletion

You may delete your account at any time by:

• Using the Delete Account option in the app (Settings → Delete Account)
• Sending an email to support@musclediary.app

On deletion, all personal data is permanently removed within 30 days, except where retention is required by law (see our Privacy Policy).

5.1 Ownership

You retain ownership of all workout data, notes, and other content you create using the Service ("User Content"). By using the Service you grant us a limited, non-exclusive licence to store, process, and display your User Content solely to provide the Service to you.

5.2 Storage and Sync

Workout data is stored locally on your device and synced to our EU-based servers when you are online. You can use the App fully offline; sync happens automatically in the background. See our Privacy Policy for full details of what we collect and how we protect it.

5.3 Data Shared with Partner Gyms

If you use the Service at a partner gym, that gym receives only aggregated, anonymised equipment usage statistics — for example how many times a piece of equipment was scanned in a given month. Your personal workout records are never shared with gyms.

You agree not to:

• Use the Service for any unlawful purpose
• Attempt to gain unauthorised access to our systems or another user's account
• Interfere with or disrupt the operation of the Service
• Reverse engineer, decompile, or attempt to extract the source code of the App
• Use automated scripts or bots to access the Service
• Submit false, misleading, or harmful content via the feedback system

We reserve the right to suspend or terminate your account if you breach these rules, without prior notice where necessary to protect the Service or other users.

The QR scan feature requires camera permission on your device. The App requests this permission only when you initiate a scan — it does not access the camera at any other time.

QR codes must be placed by authorised Muscle Diary partner gyms. We are not responsible for QR codes placed by third parties or for errors caused by damaged or incorrectly placed codes.

Muscle Diary is a tracking tool, not a medical device. The Service does not provide medical advice, diagnosis, or treatment.

• Consult a qualified health professional before starting any new exercise programme
• We are not responsible for injuries or health issues resulting from exercises you log or follow in the App
• Do not rely on the App to make medical or health decisions
• Stop exercising and seek medical attention immediately if you experience pain or discomfort

When the App crashes or encounters an error we automatically send a crash report to help us fix the problem. Crash reports contain technical information such as the error message, stack trace, device model, OS version, and the screen you were on. They do not contain your workout data. This processing is based on our legitimate interest in maintaining a functional service. See Section 2.5 of our Privacy Policy for details.

The Service, including its design, logos, source code, exercise catalogue, and equipment catalogue, is owned by Muscle Diary and protected by applicable intellectual property laws. You may not copy, modify, or distribute any part of the Service without our written consent.

The Service uses third-party providers including Supabase (database and authentication), Mixpanel (analytics, EU endpoint, consent-gated), and Sentry (crash reporting, EU endpoint, legitimate interest). Your use of the Service is also subject to the terms of these providers where applicable. We are not responsible for the actions or availability of third-party services.

We aim to keep the Service available at all times but do not guarantee uninterrupted access. We may perform maintenance that temporarily limits access, modify or discontinue features with reasonable notice, and suspend accounts that violate these Terms.

Because the App works offline, temporary service outages do not prevent you from logging workouts. Data will sync automatically when connectivity is restored.

The Service is provided "as is" and "as available" without warranties of any kind, express or implied. We do not warrant that the Service will meet your specific requirements, be uninterrupted or error-free, or that results obtained from the Service will be accurate.

To the maximum extent permitted by applicable law, Muscle Diary shall not be liable for any indirect, incidental, special, or consequential damages, including loss of data, loss of profits, or personal injury arising from your use of the Service.

Our total aggregate liability to you shall not exceed the greater of the amount you paid for the Service in the 12 months preceding the claim or 50 euros.

Nothing in these Terms limits liability for death, personal injury caused by negligence, or fraudulent misrepresentation, or any other liability that cannot be excluded under applicable law.

You agree to indemnify and hold harmless Muscle Diary from any claims, damages, costs, or expenses (including reasonable legal fees) arising from your use of the Service in violation of these Terms.

We may update these Terms from time to time. For material changes we will notify you via the App and require you to accept the updated Terms before continuing to use the Service. The effective date at the top of this page will always reflect the current version. If you disagree with the updated Terms you may delete your account.

These Terms are governed by the laws of the European Union and the laws of Poland, where Muscle Diary is based. Disputes that cannot be resolved informally shall be brought before the competent courts of Poland.

If you are an EU consumer, you retain all rights afforded to you under the consumer protection laws of your country of residence and may bring proceedings in your local courts.

If you have questions about these Terms, contact us at:

• Email: support@musclediary.app
• Website: musclediary.app