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Privacy Policy

App: Muscle Log (the "App") / Last updated: June 23, 2026 / Operator: Kaisei Ota

This Privacy Policy describes the types of information the provider of the App (the "Provider," "we") collects in connection with your use of the App, how it is used, when it is shared, and how it is managed. By using the App, you are deemed to have agreed to this Policy.

1. Information We Collect

CategoryExamplesHow collected
Account informationIdentifier and email provided via Sign in with Apple (the email may be Apple's private relay address), username, profileAt sign-in / your input
Training & nutrition dataWorkout logs (exercise, weight, reps, date/time), meal logs, goals, notesYour input
Social informationFollow/follower relationships, blocks, aggregated values for leaderboards (e.g., weekly volume, streak days)Your actions
AI coach dataChat content with the AI, inputs for menu generation, meal photosYour input / submission
Health (HealthKit) dataBody weight, active energy, step count, resting heart rate, exercise time, workouts, sleep (sleep stages, heart rate, heart rate variability (HRV), blood oxygen (SpO₂), respiratory rate, wrist skin temperature)Read from Apple Health with your permission / workouts written by the App
Purchase informationSubscription and in-app purchase status, granted credit balance (payment is processed by Apple; we do not collect card details)App Store / StoreKit
Usage & device informationApp operation logs, error information (for debugging)Automatically

2. How We Use Information

3. Handling of HealthKit Data

4. Sharing with Third Parties / Processors

We use the following external services to provide functionality. Data is transmitted to and stored by them only to the extent necessary.

ProviderPurposeMain data sent
Supabase (backend, authentication, database; region: Tokyo)Account management, data storage, aggregation, purchase credit managementAccount info, profile, social info, aggregates, AI chat history, sleep summaries (Coach plan), etc.
OpenAI (AI processing)Menu generation, meal photo analysis, chat responsesChat text, generation inputs, meal photos (not stored on the server after analysis)
Apple (App Store / StoreKit / Sign in with Apple / HealthKit)Authentication, payment, health integrationPurchase transactions, sign-in identifier

Except where there is a legitimate reason such as a disclosure request based on law, we do not provide personal information to third parties. Note that some processors such as OpenAI may process data outside Japan (e.g., in the United States).

5. Information Made Public via Social Features

Your username, profile, and certain aggregated values (rankings, streak days, etc.) may be shown to other users through the App's social features. Please do not enter information you do not wish to make public.

6. Data Retention and Deletion

7. Security

We implement reasonable safeguards, such as encryption in transit and access controls, to prevent leakage, loss, or damage of collected information.

8. Minors

Because the App includes social features, the intended age is 17 and over. If a minor uses the App, please do so with the consent of a parent or guardian.

9. Changes to This Policy

We may revise this Policy as needed. For material changes, we will provide notice in the App or on this page.

10. Contact

For inquiries regarding this Policy, please contact:
kaiseiota0620@gmail.com