Privacy Policy
reHydrate has no accounts, no servers and no analytics. What you log stays on your device, and the only other place it can go is Apple Health, if you ask it to.
reHydrate is made by Petter Vang Brakalsvålet ("we", "us"). This page explains what the app stores and what it doesn't. It is short, because the app collects nothing about you.
What the app stores
Everything reHydrate records is written to your device and stays there:
- your drink log: what you drank, how much of it, and when
- your daily goal, and whether you count in millilitres or ounces
- the reminder times you set
- settings such as language, appearance and the app icon you picked
This sits in a storage container shared between the iPhone app, the Apple Watch app and the widgets, so all three show the same numbers. We have no copy of it and no way to reach it.
Apple Health
If you give permission, reHydrate writes your water intake to the Health app, and reads back water that other apps have logged there so your total is right whichever app you drank through. That exchange happens on your device, between reHydrate and Health. Health data is governed by Apple's rules, and you can withdraw the permission whenever you like in the Health app or in iOS Settings. Anything reHydrate has already written to Health stays in Health until you delete it there.
Reminders
Reminders are local notifications. Your device schedules them itself from the times you choose. Nothing is sent to a push server, and no notification service learns that you use the app.
Apple Watch and widgets
The Watch app and the iPhone app pass your numbers to each other over Apple's device-to-device connection. That traffic stays between your own two devices and is not relayed through us.
What we don't collect
No account, no email address, no name. No analytics, no tracking, no advertising, no location, no device identifiers, and no crash reports sent to us. There is no server behind reHydrate, so there is nowhere for your data to be sent and nothing for us to sell.
Third-party code
reHydrate depends on two open-source Swift packages, CalendarKit and LoggingKit, both written by the same developer as the app itself. They run entirely on your device. LoggingKit writes debug messages to the system console, which never leaves your phone. There are no third-party SDKs in the app: no analytics vendor, no ad network, no crash reporter, no Firebase.
The App Store
Apple distributes the app and handles the download, and collects its own data when you install it. That is covered by Apple's privacy policy rather than this one. As the developer, we see the aggregate figures Apple shows in App Store Connect, such as download counts, crash counts and ratings. Apple anonymises those before we see them, and they cannot be traced back to you. reHydrate is free and has no in-app purchases, so no payment details are involved anywhere.
Backups
If you back up your device to iCloud or to a computer, your reHydrate data goes into that backup along with everything else on the device. The backup belongs to you and to Apple. We have no access to it, and you control it in iOS Settings.
Deleting your data
Delete individual entries inside the app, or delete the app to remove everything it has stored. Water that was written to Apple Health has to be deleted in Health, since it lives there now. There is no deletion request to send us, because we are not holding anything.
Your rights
The UK GDPR and the EU GDPR give you the right to access, correct, erase, export or restrict the personal data an organisation holds about you. Those rights bite on data a controller actually holds, and we hold none of yours. Your reHydrate data is on your own device, under your control. You can still write to us with a question, and you can complain to the UK Information Commissioner's Office (ico.org.uk) or to your local EU supervisory authority.
Security
Your data is protected by the things that protect the rest of your phone: the iOS app sandbox, device encryption and your passcode. Keeping a passcode set and iOS up to date is the useful thing you can do. Because nothing is transmitted, there is no connection for anyone to intercept.
Children
reHydrate is rated 4+ and is fine for children to use. It collects no personal data from anyone, at any age.
Check it yourself
reHydrate is open source. If you want to confirm that the app does what this page says, read the code at github.com/PetterBraka/reHydrate.
Changes to this policy
If the policy changes, the date at the top changes with it, and the current version is always at this address.
Contact us
Questions about this policy? Email petter@braka.dev, or open an issue at github.com/PetterBraka/reHydrate/issues.