Effective date: October 27, 2026
SANGE Studio (a sole proprietorship in Japan, the Operator) sets out below how information is handled in SANGE Metronome – Simple Rhythm Practice (the App).
1. Information stored on the device
The App stores tempo, time signature, sound, count-in and other settings, favorite names and settings, and the selected display language on the device to restore settings and provide features. There is no feature to store or synchronize these on the Operator’s servers.
Depending on device and operating system settings, this data may be included in operating system backups and restoration. Handling follows the settings and terms of the operating system or backup service used.
2. Information transmitted automatically
The production release uses the following Google services. Information needed by each service is sent to Google during use.
Firebase Crashlytics: To investigate defects, identify causes and improve stability, the App sends crash and error details, stack traces, occurrence times, app version, technical information about the operating system and device, and identifiers for the app installation. No process sets names or email addresses as user IDs or sends favorites or settings as diagnostic fields.
Diagnostic information is collected automatically in the production release. There is currently no in-app setting to stop collection.
Firebase App Check / Play Integrity API: To prevent misuse and verify app and device legitimacy, attestation information, verification results and App Check tokens are processed. Service providers may process communication data such as IP addresses during communication with the services.
Firebase App Check uses Google’s Play Integrity API for Android attestation. Information needed to check app and device integrity and recognition by Google Play is sent to Google, and verification results are processed.
Google Play automatic protection: This is used to deter unauthorized redistribution and piracy. Distribution sources and similar details are checked. If checks fail, users may be prompted to obtain a legitimate copy from Google Play. Communication with Google Play may be required. Google’s processing is governed by its privacy policy and related terms.
These security checks are not used for advertising or tracking for advertising purposes. See Firebase privacy and security information and Google Privacy Policy for service data practices, and Play Integrity API and Google Play automatic protection for feature descriptions.
3. Information not collected and features not implemented
The App has no account registration, advertising, tracking for advertising purposes, usage analysis through Google Analytics, in-app purchases or subscriptions. It does not record through the microphone or collect location or contacts.
The App itself is sold for a fee on Google Play. Google Play and payment service providers handle payment information; the App does not directly collect credit card numbers or similar details. The Operator may view order and transaction information needed for sales management and refunds through Google Play Console or similar tools. Google handles information under its own privacy policy and related terms.
4. Information received through inquiries
Email addresses, inquiry details and attachments you provide are used for replies, defect investigations and necessary communication. Please do not send sensitive personal information or information unnecessary for investigation.
For purchase or refund inquiries, we may request an order number, purchase date and time, or other information needed to verify the transaction. It is used for purchase verification, refunds, fraud prevention and legally required records. We never request credit card numbers or Google Account passwords.
5. Disclosure and processing abroad
The Operator does not sell information or provide it for advertising. Processing is entrusted to service providers such as Google within the scope necessary for the purposes above. Information may also be disclosed where permitted by law, including with the individual’s consent or as required by law.
Firebase information may be processed on Google infrastructure outside Japan. The Operator takes measures required by applicable law for selecting and managing providers and for handling information abroad.
6. Retention and deletion
Device settings and similar data can be deleted by clearing app data or uninstalling. For operating system backups, check the backup service’s settings.
According to Google, Crashlytics stack traces and associated identifiers are retained for 90 days, after which deletion from live and backup systems begins. Other service data follows each service’s retention policy.
Inquiry information is kept as long as necessary to respond and resolve related issues, then deleted when no longer needed unless legally required to be retained.
Order and transaction information is retained for sales management, refunds and legally required tax, accounting and other periods, then deleted when no longer needed. Information held by Google follows Google’s retention policies.
Uninstalling does not immediately delete information already transmitted externally.
7. Security and user requests
The Operator implements necessary and appropriate safeguards, including access restrictions, to prevent unauthorized access, leaks, loss or damage.
Contact the address below to request notification of purposes of use, disclosure, correction, suspension of use, deletion or similar action regarding personal information held. Requests are handled under applicable law after identity verification. Because the App has no accounts, it may be impossible to link an installation identifier to a person and identify particular diagnostic information.
8. Children and parents or guardians
The App is also intended for children under 13. It has no features requiring account creation or entry of children’s names, birth dates or contact details. However, information for investigating failures and checking security is transmitted automatically as described in section 2. The same mechanism operates for children, and there is currently no age-based switch for transmission.
Parents and guardians should read this policy with their children. Where possible, inquiries should come from a parent or guardian without unnecessary information such as the child’s name or contact details. Questions about children’s information and requests for disclosure or deletion can also be sent to the contact in section 10 and will be handled under applicable law.
9. Changes to this policy
If features or information handling change, this policy will be updated and notice given in the App or on a public page as appropriate to the change. Where legally required, consent will be obtained before the changed handling begins.
10. Operator and contact
Operator: SANGE Studio (sole proprietorship in Japan)
Address: Mutsumi Building 3F, 2-10-48 Kitasaiwai, Nishi-ku, Yokohama, Kanagawa 220-0004, Japan
Contact: contact@sange-studio.com