Last updated: 23 July 2026
ReefTracker ("the app") is an offline application for tracking reef aquarium water parameters. This policy explains how the app handles your information. In short: the app does not collect, transmit, or share any of your data with the developer or any third party. If you enable the optional Google Drive backup, your data is uploaded only to your own Google Drive.
None. The app does not collect any personal information. It has no user accounts, no login, and no servers. All data you enter – such as your tanks, water parameter readings, and settings – is stored only locally on your device.
Your data is used solely to provide the app's features on your device (recording readings, showing history and graphs, and calculating values). It never leaves your device unless you choose to export it yourself or enable the optional Google Drive backup described below.
The app does not send your data to the developer or to any third party. It contains no third-party analytics, advertising, or tracking SDKs, and it shares your data with no one.
The app lets you create backup files of your data. These files are created and stored where you choose (for example, your device storage or a location you share them to). You are in full control of any backup file you create, and the app does not upload it anywhere unless you enable the Google Drive backup described below.
On Android, you can optionally connect the app to your Google account to keep backups of your data in your own Google Drive. This feature is off by default and only works after you explicitly sign in and turn it on. When enabled:
The app's use of information received from Google APIs adheres to the Google API Services User Data Policy, including the Limited Use requirements.
The app can use your device's camera for one optional feature: scanning the display of a Hanna pocket checker to read a measurement without typing it. The camera is used only while you are on the scan screen, recognition runs entirely on your device, and no photos are stored or uploaded – only the numeric reading you confirm is saved, locally, like any other reading. If you never use the scan feature, the camera is never accessed.
The app can optionally connect to a Hanna Lab photometer over Bluetooth to run measurements and import results. Bluetooth is used only when you initiate a connection, and the measurements received are stored locally on your device like any other reading. On older Android versions (Android 11 and below), the system requires the location permission for Bluetooth scanning; the app does not determine, store, or transmit your location.
All data lives on your device for as long as you keep it there. You can delete any of it at any time inside the app, and uninstalling the app removes all of its data from your device. Backup files you created remain wherever you stored them until you delete them; backups in your Google Drive can be deleted from your Drive at any time. Because the developer holds no copy of your data, there is nothing further to request deletion of.
The app only requests device permissions needed for features you use: saving or sharing backup files at your request, showing reminder notifications if you set reminders, the camera if you scan a checker's display, and Bluetooth if you connect a Hanna meter (see above). It does not access your contacts or microphone.
The app does not knowingly collect any information from anyone, including children, because it does not collect information at all.
If this policy changes, the updated version will be posted at this same address with a new "Last updated" date.
If you have any questions about this privacy policy, contact: bobrovsky@seznam.cz