Sajulume Privacy Policy

Effective date: 2026-11-10

Sajulume is a Korean Saju (Four Pillars) chart app: it turns a birth date and time into eight characters, explains what each character means, shows the five elements balance and 10-year luck cycles, shows the day pillar and an I Ching hexagram for each day, lets you save charts for family and friends, and offers daily reminders and a home screen widget (the "app"). It is provided by DDJ A1 ("we", "us"). This policy explains what data the app handles and how. Sajulume has no account system and we do not run a server for it. Every chart is calculated on your device.

Data stored on your device

The names, birth dates, birth times, gender, memos and the "this is me" mark you enter for each chart, and your settings (reminders, theme), are stored only on your device. They are not sent to us. Deleting a chart in the app removes it, and uninstalling the app deletes all of this data from your device. If device backup is turned on, Android's standard app backup may include this data in your own Google account backup. That backup is controlled by you and Google, not by us.

Sharing a chart and copying an AI prompt

When you tap Share chart, the app opens the Android share sheet with a short text of that chart (the name you entered, the eight characters and the Day Master). Nothing is sent unless you choose an app to share it with; what happens next is up to that app.

When you tap Copy AI prompt, the app copies a text to your device's clipboard that includes that chart's birth date and time, gender and chart details. The app does not send it anywhere and does not contact any AI service. If you paste it into another app or website, that service's own privacy policy applies.

Permissions the app asks for and why

• Notifications (optional). Used for a short morning and evening note about the day pillar. You can decline and every feature still works.
• Run at startup. Lets reminders come back after your phone restarts or the time zone changes.
• Vibration. Used for reminder notifications (you can turn it off).
• Internet access, network state and the advertising identifier (AD_ID). Used only by the advertising components described below. Every chart in the app works offline.

The app does not request your location, the camera, microphone, storage or media permissions, your contacts, or access to health data.

Information collected automatically

When you use the app, third-party SDKs used for advertising may collect some information automatically, including:

• Your device's Internet Protocol (IP) address, which may be used to estimate your approximate (general) location
• Device or other identifiers, such as your device's advertising identifier (Advertising ID) and app set ID
• App interactions, such as session time, screens viewed, and ad views and taps
• Crash logs and diagnostic information, such as your device's operating system and model, and ad performance data

The advertising SDK collects this information and shares it with Google (AdMob) and its advertising partners for advertising, analytics, fraud prevention, security and compliance. It is encrypted in transit. The app itself does not send the names, birth dates, birth times, memos or charts you enter off your device, and we do not link the advertising data to them.

Advertising

The app shows advertisements from Google AdMob:

• a banner at the bottom of the screens
• an ad when the app starts from the launcher
• full-screen ads only at a few moments: when you open a saved person's chart from the People list, and after you save a chart
• an ad in the exit dialog
• optional video ads you can choose to watch from Settings to see fewer ads for 24 hours

A full-screen ad never appears while you are typing, when you switch tabs, or when you open the app from the widget or a notification. To serve ads, AdMob and its partners may access your device's Advertising ID and the information described above. In the European Economic Area (EEA), the United Kingdom and other regions where required, the app shows a consent form through Google's User Messaging Platform (UMP) before personalized advertising data is used. If you decline, you are shown non-personalized ads instead. You can reset or limit ad personalization at any time in your device settings (Settings → Google → Ads), and you can change your consent choice from the app's Settings screen.

For more information on how Google uses data when you use partners' apps, see https://policies.google.com/technologies/partner-sites.

Cultural and entertainment notice

Saju is a Korean cultural tradition. The readings in the app describe general tendencies for interest and entertainment. They are not predictions and are not medical, legal, financial or psychological advice. Solar terms are calculated astronomically (about ±15 minutes), so a birth within minutes of a term boundary may differ from other almanacs.

Children

Sajulume is a general-audience app and is not directed to children under 13. We do not knowingly collect personal information from children.

Your rights

Your app data exists only on your device, so you control it directly: you can edit or delete any chart in the app, and uninstalling the app removes everything the app stored. Depending on where you live (for example under the GDPR in the EEA/UK or the CCPA in California), you may also have rights over data processed by advertising SDKs. You can exercise your ad choices through the consent form and your device's ad settings described above.

Changes

We may update this policy. Material changes will be reflected on this page with a new effective date.

Contact

Questions? Email bloodturtle@naver.com.