DayVow: 90 days challenge - Privacy Policy

Last updated: 20 October 2026

DayVow, listed on the App Store as “DayVow: 90 Day Challenge” (“the app”), is made by Cambrian Labs B.V., The Netherlands, KvK 666.91.680 (“we”, “us”). This policy explains what the app does with your data. The short version: your challenge, check-ins and photos stay on your phone. The only data that leaves your device is what Apple and our purchase processor need to handle a subscription.

1. Data that stays on your device

Everything you create in the app is stored only on your device, in the app’s own storage:

Your challenge set-up (preset or custom rules, mode, start date, your first name if you enter one).
Daily check-ins and streaks.
Progress photos you take or pick. They are saved in the app’s private storage, reduced in size, and never uploaded anywhere by us. If you export a photo, a timeline card or a collage, the file goes wherever you send it through the iOS share sheet; that is your action, not ours.
Reminder settings and the data the home-screen widget shows (kept in a shared container on the device so the widget can read it).

We cannot see this data. Deleting the app deletes it, including the photos. The app has no accounts and no cloud sync, and photos are not backed up by us; your device’s own iCloud or computer backup may include them as part of the app’s data.

2. Camera and photo library

The app asks for camera access to take a progress photo, and for photo-library access only when you pick an existing photo or save an export. It never scans your library.

3. Notifications

Daily reminders are local notifications scheduled on your device. No notification data is sent to us.

4. Purchases

The app requires a subscription (billed every three months or yearly) sold through Apple’s App Store. Purchases are processed by Apple under Apple’s terms and privacy policy. To unlock the app and restore purchases, the app uses RevenueCat, a purchase-validation service. RevenueCat receives:

An anonymous, app-generated identifier for your installation (not your name, email or Apple ID).
Your subscription status for this app, as reported by Apple.
Basic device information needed to validate receipts (device type, operating system version, app version, an app-scoped device identifier).

RevenueCat processes this data on our behalf to tell the app whether your subscription is active. RevenueCat’s privacy policy is at https://www.revenuecat.com/privacy. We do not sell this data and we do not use it for tracking across apps or websites.

5. Data we do not collect

The app contains no analytics or advertising SDKs, no accounts, and no tracking as defined by Apple’s App Tracking Transparency framework. We do not receive crash reports unless you have opted in to share analytics with app developers in iOS Settings, in which case Apple provides them to us in aggregated form.

Some presets contain general fitness or nutrition guidance with sources. The app does not collect health data, does not connect to Apple Health, and is not a medical service. See the Terms of Use for the full disclaimer.

7. Support email

If you write to support@cambrian-labs.com, we keep the email to answer you and to improve the app. We do not add you to any list.

8. Age

The app is for people aged 13 and over. We do not knowingly collect personal data from children under 13; the app collects none in any case, since all personal content stays on the device.

9. Your rights

Because the app’s data lives on your device, you control it directly: delete entries or photos in the app, or delete the app. For the purchase data held by RevenueCat on our behalf, you can ask us to access or delete it by emailing support@cambrian-labs.com with your purchase receipt. Residents of the European Economic Area have the rights set out in the GDPR, including the right to lodge a complaint with the Dutch Data Protection Authority (Autoriteit Persoonsgegevens).

10. Retention

On-device data is kept until you delete it. Subscription records at RevenueCat are kept for as long as needed to provide access and to meet tax and accounting obligations.