DFL inc. ("we," "us," or "our") establishes this Privacy Policy regarding the protection of users' personal information and privacy in connection with the Android application "Calculator" (the "App").
We comply with the Act on the Protection of Personal Information of Japan and other applicable laws, regulations, and guidelines, and handle users' personal information appropriately.
The App is a calculator application that primarily provides arithmetic calculation functions. Its main features include:
The App does not require user account registration and does not transmit any personal information to our servers. Calculation history and settings are stored exclusively on the user's device.
The App uses the following third-party services, which may collect certain information.
The free version of the App displays advertisements using Google AdMob. Google AdMob may automatically collect the following information for ad delivery and performance measurement:
For details, please refer to Google's Privacy Policy.
When ads are disabled through in-app purchase, information collection by AdMob will not occur.
In-app purchases in the App are processed using the Google Play Billing Library. Purchase-related information (purchase history, payment details, etc.) is managed by Google Play.
For details, please refer to Google Play Terms of Service.
Information collected by third-party services is used for the following purposes:
The following information is stored exclusively on the user's device:
Android OS includes an Auto Backup feature that automatically backs up app data to Google Drive. The App's on-device data (calculation history, settings, etc.) may be backed up through this feature. Auto Backup is a system feature of Android OS and is not a feature provided by the App. Users can manage auto backup through the device's "Settings" > "Google" > "Backup" as a device-wide backup setting.
The App does not have the functionality to collect or store users' personal information, and we do not provide any personal information to third parties.
However, if personal information is included in emails voluntarily sent by users through the feedback feature described in Article 7, we will not use such information for any purpose other than responding to the inquiry.
Users can send feedback via email from the App's settings screen. When sending feedback, the device's email application will launch with device model, OS version, app version, and other information automatically populated in the email body. Sending the email is at the user's discretion, and the content can be reviewed and edited before sending.
The App does not intentionally collect personal information from children under the age of 13. If we become aware that a child under 13 has provided personal information, we will promptly take measures to delete such information.
Users have the following rights:
We take reasonable security measures to prevent unauthorized access to, loss, destruction, alteration, and leakage of personal information.
We may revise this Policy in response to changes in laws, regulations, or service content. The revised Privacy Policy shall take effect upon publication on this page.
For inquiries regarding this Policy, please contact us at:
Effective Date: February 14, 2026