Privacy Policy

This Privacy Policy explains how the Aqualog app handles data about you and your aquarium activity. This is an educational app and does not provide guarantees or professional advice.

Last updated: 2026-03-19

1) Scope and important disclaimer

The app may show ranges, calculations, and reminders related to aquarium water chemistry and maintenance. Aquarium outcomes depend on many factors (existing water conditions, livestock needs, product quality, dosing accuracy, temperature, filtration, CO2, plant health, and more).

Risk disclaimer (water chemistry, deaths, plant damage): To the maximum extent permitted by law, we are not responsible for any harm, losses, injuries, deaths of animals, plant damage, or other consequences that may result from the use of the app, its calculators, its measurements, its maintenance suggestions, or any changes to water chemistry performed by you. You are solely responsible for how you apply any information.

Not professional advice: The content is for hobbyist guidance only. Always follow product manufacturer instructions and, when necessary, consult qualified professionals.

2) Data we store and why

Aqualog uses Firebase services to keep your data available across devices (and to enable offline persistence). We store data per signed-in user.

Authentication data (Firebase Auth)

When you sign in with Google, we use your Google identity to authenticate you. When you use anonymous sign-in, we create an anonymous account (and may merge your data later).

Core aquarium data (Firestore)

We store:

- Your aquariums (names, setup date, basic equipment/status fields, and your configured reminder settings)
- Your maintenance logs (the measurements you enter, including optional fields like TDS and water change volume)
- Your livestock counts and types (alive items as currently configured in your tank)
- Your premium status (whether you subscribed and removed ads)

Offline cache

Firestore persistence is enabled, so some data may be cached on the device while you are offline. This allows the app to work without connectivity and syncs changes when a connection is available.

Local device data

Some preferences and UI data are stored locally on your device, such as:

- Dark mode preference
- Your per-tank “favorite” log parameters and the log form field order
- Aquarium thumbnail images (stored locally for faster display)

3) Ads and subscription

AdMob

The app shows advertising through Google AdMob when you are not a premium subscriber. AdMob may use advertising identifiers and device information to display ads.

Ads are shown for supported users only; the specific data collected by AdMob is governed by Google’s policies.

Premium subscription (Google Play Billing)

Premium is purchased via Google Play. When premium is active, ads are removed. We store/refresh your premium status (e.g., in Firestore) so the app can show or hide ads consistently.

4) Google sign-in and anonymous sign-in

Google sign-in

If you choose “Continue with Google”, we authenticate you with Firebase using your Google account. Your app data is associated with the signed-in Firebase user.

Anonymous sign-in

If you choose “Use without sign-in”, we create an anonymous Firebase account. Your aquarium data is stored under that anonymous account.

Merging anonymous data

If you start with anonymous sign-in and later sign in with Google, we may merge your anonymous data into your Google account so you do not lose your aquariums/logs.

5) Data loss and limitations

While we provide offline caching and automatic synchronization, no system can guarantee that all data is preserved in every situation. Network interruptions, device changes, app updates, and storage limits can affect synchronization timing.

We are not responsible for any data loss or sync failure beyond what is required by applicable law. You should keep your own backups when possible for critical information.

6) How to delete your data

You can manage your session using Sign out in the app settings.

Delete account (permanent)

If you are signed in, the app Settings screen includes a Delete account button. When you confirm, we:

1. Delete your Firestore data (aquariums, livestock, and logs linked to your account)
2. Delete your Firebase Auth account
3. Remove locally stored preferences and aquarium thumbnail images from your device

Deletion timing may vary depending on connectivity. Some third-party systems (e.g., Google/Play services) may retain limited billing records as required by law. This app deletes what it owns/controls.

7) Contact

If you need more information or help with data deletion requests, please contact the app provider.