Effective date: 4 November 2026

This Privacy Policy explains how the ShutterTools app for Android, iOS and macOS ("ShutterTools", "the app", "we", "us") handles information. The app is developed and published by Frantisek Novotny, who is the data controller for the purposes of the EU General Data Protection Regulation (GDPR).

In short: ShutterTools has no user accounts and never sends your location or the places you save to us. To find places by name and to show the name of a location, the app sends the search text or the coordinates to your operating system's map service: Apple's on iOS and macOS, Google's on Android. On Android and iOS, the app also sends anonymous usage statistics to Google Firebase Analytics and, if the app crashes, a crash report to Google Firebase Crashlytics. The Mac app does neither. Everything else works offline.

1. Information processed only on your device

The following information is used by the app and stored only on your device. We never receive it. Apart from the place lookups described in section 2, it is not sent to any server.

• Location. If you allow location access, the app reads your device's location (precise or approximate, as you choose) to calculate sunrise, sunset, golden hour, blue hour and sun and moon positions for where you are. The last known location is stored on the device so the app can show results when no fresh location is available. The app sends your location only to your operating system's map service, to look up a readable name for it (see section 2). It never sends your location to us.
• Compass heading. The compass uses the device's motion and magnetic sensors to show directions of the sun and moon. Sensor readings are used live and not stored. Macs have no such sensors, so the Mac app doesn't use them.
• Saved places. Places you save (a name you type and its coordinates) are stored on the device.
• Settings. Your preferences, such as camera sensor format, megapixels, units, clock format and theme, are stored on the device.
• Calculator inputs. Values you enter in the exposure, depth of field, field of view, flash, star trail and other tools stay on the device.

The app works fully without location access; you can pick or enter a place manually instead.

If you have enabled device backups (Google backup on Android, iCloud backup on iOS, Time Machine on macOS), your operating system may include the app's on-device settings and saved places in that backup. Cloud backups are handled by Google or Apple under your account and their privacy terms, and Time Machine backups stay on the backup disk you choose; we have no access to them.

2. Place search and place names

To find places by name and to show a readable name for a location, the app uses the map service built into your operating system: Apple's on iOS and macOS, and Google's on Android.

• Place search. When you search for a place, the text you type is sent to that service, which returns matching places.
• Place names. When the app gets your current location, or when you enter coordinates for a place, those coordinates are sent so the service can return a name, such as a street or town.

The app sends nothing else with these requests, and we never receive them. Your operating system makes the requests, and Apple or Google handles them under their own privacy terms:

• Apple Privacy Policy: https://www.apple.com/legal/privacy/
• Google Privacy Policy: https://policies.google.com/privacy

Without an internet connection, place search doesn't work and names are looked up later. All calculations work without these lookups.