Privacy Policy

Astro Observation Log — Last updated: June 16, 2026

1. Overview

Astro Observation Log ("the App") is a free Android app developed by 강건한건강 ("we", "us"). It lets amateur astronomers log observation sessions — target, equipment, location notes, and what they saw — and track Messier catalog progress. This Privacy Policy explains how we handle information when you use the App.

2. Information We Collect

The App does not collect, store, or transmit any personal information to our servers. It has no user accounts and no server-side communication other than loading advertisements (see Section 3). All observation entries you create are stored locally on your device only.

3. Third-Party Services

The App uses the following third-party service:

• Google AdMob — for displaying advertisements. The App shows a banner, a full-screen ad at natural breaks, and an app-open ad on launch. AdMob may collect device identifiers (such as Advertising ID) and usage data to serve personalized or non-personalized ads. For more information, see the Google Privacy Policy.

4. Permissions

The App requests internet access only (to load advertisements). The App does not use or request access to your location, contacts, camera, microphone, or files.

5. Data Storage

The App does not create user accounts and does not sync any data to the cloud. All observations and settings stay on your device. Uninstalling the App removes all stored data along with any cached AdMob data.

6. Children's Privacy

The App is suitable for general audiences and is not directed at children under the age of 13. We do not knowingly collect personal information from children.

7. Changes to This Policy

We may update this Privacy Policy from time to time. Any changes will be posted on this page with an updated revision date.

8. Contact Us

If you have any questions about this Privacy Policy, please contact us at: [email protected]