Hydrolotl
Privacy Policy
Last updated: 29 September 2026
Hydrolotl is a water-intake tracker with an axolotl companion, made by Chili Logic ("we", "us"). This policy explains what happens to your data when you use the Hydrolotl app for iPhone and iPad.
The short version: your water log stays on your device and, if you turn it on, in your own private iCloud. We don't run servers that store your data, we can't see your log, and we have no ads, no tracking and no data selling.
1. Who is responsible
The data controller for the app is Chili Logic. Contact: support@chili-logic.com
2. What the app stores, and where
Your water log (on your device)
Everything you record in Hydrolotl (drinks, amounts, times, your daily goal, your axolotl's progress and your settings) is stored on your device. It is not sent to us.
Optional iCloud sync (your private iCloud)
If you turn on Sync with iCloud, your Hydrolotl log is copied to the private CloudKit database in your own iCloud account, so you can use the app on several devices and restore your log after reinstalling.
- The private database belongs to your Apple Account. Only you can access it. We (the developer) cannot read, export or change it.
- Storage and security are handled by Apple under Apple's Privacy Policy.
- The sync contains only the entries you log in Hydrolotl. Data read from Apple Health is never copied to iCloud.
- You can turn sync off at any time in the app's Settings.
Optional Apple Health (HealthKit)
If you allow it, Hydrolotl can write the water and caffeine you log to Apple Health and read water entries from Apple Health, so your totals match. You choose exactly which types to share in the iOS permission screen and can change this at any time in iOS Settings > Health > Data Access & Devices > Hydrolotl (or in the Health app).
We handle Health data according to App Store Review Guideline 5.1.3:
- Health data is used only to show and update your hydration in the app.
- It is never used for advertising, marketing, analytics or data mining, and never sold.
- It never leaves Apple Health except as you allow on your device. It is not sent to us or to any third party, and it is not stored in iCloud by Hydrolotl.
Reminders, Siri, widgets and the Lock Screen
Reminders are local notifications scheduled on your device. Siri / Shortcuts actions read and update your log on the device. Widgets, the Control Center controls and the pearl bubble on the Lock Screen (a Live Activity) show today's water from a small copy kept on your device in the app's own shared container, and their buttons log drinks on the device. None of this sends data to us.
Sharing
If you choose to share something (for example an image of your week) through the iOS share sheet, it goes only where you send it.
3. Purchases
Hydrolotl is free to use. Optional Hydrolotl Plus purchases and subscriptions are processed entirely by Apple through the App Store (StoreKit). We never receive your payment details, name, email address or Apple Account. The app only receives Apple's confirmation of which product is active (and until when) so it can unlock Plus on your device. Manage or cancel subscriptions in your Apple Account settings.
4. Anonymous usage statistics (not active yet)
Not active in the current version. We may add this in a future update, and we will update this policy when we do.
To learn which features are useful, a future version may collect anonymous usage statistics without personal identifiers using TelemetryDeck, a privacy-focused analytics service. If added:
- statistics describe how the app is used (for example "a reminder was set" or "a screen was opened") and basic technical details such as the app and iOS version;
- they contain no name, email, Apple Account, advertising identifier, location, or water log, and never any Health data;
- they are not used to track you across apps or websites, are not combined with other data, and are not sold.
5. What we don't do
- No advertising and no advertising SDKs.
- No tracking. We don't track you across other companies' apps or websites, and the app does not ask for tracking permission (App Tracking Transparency) because it doesn't track.
- No selling or renting of data, ever.
- No accounts. Hydrolotl has no sign-up and no login.
6. Crash reports
If you have enabled Share with App Developers in iOS Settings > Privacy & Security > Analytics & Improvements, Apple may share anonymous crash reports and diagnostics with us. Apple controls this setting, and these reports do not identify you.
7. Deleting your data
- In the app: Settings > Delete all data erases your Hydrolotl log from the device and also removes the copy in your private iCloud.
- Deleting the app removes everything stored on the device. (If iCloud sync was on and you did not use Delete all data first, the iCloud copy stays in your iCloud account; you can remove it by reinstalling the app and using Delete all data, or in iOS Settings > [your name] > iCloud > Manage Account Storage.)
- Apple Health: entries saved to Apple Health belong to Apple Health. When saving to Health is on, Delete all data can also remove the entries Hydrolotl saved there. You can review or delete them in the Health app at any time, and revoke Hydrolotl's access in the Health settings.
Because we don't store your data on our servers, there is nothing for us to delete on our side; you stay in control on your device.
8. Your rights
Depending on where you live (for example under the EU/UK GDPR or California privacy law), you may have the right to access, correct, delete, or port your personal data, and to object to or restrict its processing. Since your data stays on your device, in your private iCloud and in Apple Health, you can exercise these rights directly in the app and in iOS settings. For any question, write to support@chili-logic.com. You also have the right to lodge a complaint with your local data protection authority.
9. Children
Hydrolotl is a general-audience app and is not directed at children under 13. We do not knowingly collect personal information from children. The app does not collect personal information from anyone. Purchases by minors are subject to Apple's parental controls (such as Ask to Buy).
10. Changes to this policy
If we change how the app handles data, we will update this page and the "Last updated" date before the change takes effect. Significant changes will also be mentioned in the App Store release notes.
11. Terms of use
Hydrolotl uses Apple's standard Licensed Application End User License Agreement (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
12. Contact
Chili Logic Email: support@chili-logic.com