Privacy Policy

Article 1 (App provider information)

Engineer BA-Sulto (“we,” “us”) provides the app “Arujikan” (Japanese Walking Timer) (the “App”). We take the protection of users’ personal information and privacy seriously and set forth this Privacy Policy (“Policy”) as follows.

Article 2 (Types of information and purposes of use)

We collect the following information in the App and use it for the purposes stated.

2.1 Information stored on the device only (no external transmission)

The above is stored on the device (SQLite / AsyncStorage) and is not sent to our servers.

2.2 Information transmitted externally

Article 3 (How we collect information)

We collect information by the following means:

1. Direct input: Information you enter in forms or settings in the App
2. Automatic collection: Information collected automatically when you use the App via modules described below
3. Inquiries: Content of inquiries sent to our email address

Article 4 (External transmission and analytics / advertising modules)

[Disclosure based on the Telecommunications Business Act, Article 27-12]

For service improvement and advertising, the App uses the following third-party tools (information collection modules). Information may be sent from your device to the providers’ servers.

Tools used may change; we will update this Policy when they do.

Article 5 (Photo library access)

The App may request access to your photo library for:

• Saving training result images to the library
• Attaching screenshots when sending feedback

Selected images become part of feedback data stored on the device and are not sent to our servers.

Article 6 (Disclosure to third parties)

We do not provide personal information to third parties without your consent, except:

1. When required by law (e.g., lawful requests from courts or law enforcement)
2. When necessary to protect life, body, or property and obtaining consent is difficult

Article 7 (Storage and security)

1. We store personal information we obtain with appropriate security measures.
2. Access to personal information is limited to what is necessary for our operations.
3. We use SSL/TLS encryption for transmission where applicable.
4. We delete information that is no longer needed for its purpose within a reasonable period, using secure methods.

Article 8 (Disclosure of personal information)

1. When you request disclosure of your personal information, we will disclose it to you without undue delay.
2. How to request: Contact us through the inquiry channel below. After identity verification, we will respond without undue delay.

Article 9 (Correction and deletion)

1. If your personal information we hold is incorrect, you may request correction or deletion.
2. If we determine that a request should be honored, we will correct or delete the information without undue delay and notify you.
3. Profile and feedback data stored on the device can be removed by deleting app data or uninstalling the App.

Article 10 (Suspension of use, etc.)

1. You may request that we stop using or erase your personal data.
2. Uninstalling the App stops automatic collection of certain information.
3. You may limit ad identifier tracking in device settings.
4. To disable Firebase Analytics data collection, uninstall the App.

Article 11 (Children’s privacy)

The App is not directed at children under 9. We do not knowingly collect personal information from children under 9. If we learn that we have collected such information, we will delete it promptly.

Article 12 (Changes to this Policy)

1. We may change this Policy without notice except where required otherwise by law.
2. For material changes, we will notify you in advance via in-app or push notifications.
3. Unless we specify otherwise, the revised Policy takes effect when posted in the App.

Article 13 (Contact)

For questions about this Policy, contact:

Last updated: February 28, 2026