Privacy Policy - Zuva
This Privacy Policy explains how Zuva, developed by One4Studio, handles your information. Zuva is designed to be private: there are no accounts, we run no ads and no third-party analytics, and your health and personal content stays on your device. The only time information leaves your device is when you choose to use the cloud AI coach, as described below.
Data Stored on Your Device
The following is stored locally on your device and, if you enable iCloud sync (a Pro feature, off by default), synced privately through your own Apple iCloud (CloudKit) account:
- Your habit logs, streaks, and badges
- Journal entries and mood check-ins
- Progress photos
- Fasting sessions
- Your profile — such as your first name, goal, and bed/wake times
- Whether you have an active Zuva Pro subscription
Apple Health (Optional)
If you grant access, Zuva reads certain Apple Health data — such as steps, active energy, heart rate, heart-rate variability, sleep, VO2 max, body measurements, workouts, and mindful sessions — to verify habits and show trends. This data is used only on your device and is never sent to our servers. Zuva does not sell or share your health data.
Camera, Photos & Voice (Optional)
With your permission, Zuva uses your camera and photo library for progress photos (stored on your device), and your microphone for journal dictation. Speech transcription is performed on your device.
App Blocking / Screen Time (Optional)
If you enable the “No Screens” bedtime blocker, Zuva uses Apple's Family Controls (Screen Time) framework to shield the apps you choose. Your selection is handled entirely by Apple on your device as opaque tokens — Zuva never sees which apps you pick, and this information is never sent to us.
AI Coach
Zuva includes an AI coach. When possible, it runs fully on your device using Apple's on-device model, and nothing is sent anywhere. If you use the cloud coach, your message and a limited amount of context — your first name, your goal, your active habit names, today's score, your streak, and your program week — are sent through our secure proxy (hosted on Cloudflare) to Google's Gemini API to generate a reply. An anonymous, randomly generated device identifier is used only to authenticate the request and enforce usage limits; it is not linked to your identity. We do not store your conversations on our servers beyond the temporary counters needed to prevent abuse. Your messages are processed by Google under its own privacy policy.
Subscriptions & Purchases
Zuva Pro subscriptions are processed by Apple through the App Store. We use RevenueCat to manage subscription status. Apple and RevenueCat handle purchase information (such as an anonymous purchase identifier and receipt) under their own privacy policies. We never receive your card or payment details.
Data Sharing
We do not sell your personal data, and we do not use it for advertising. We share limited information only with the service providers needed to run the app: Apple (App Store, iCloud, Health, Screen Time), RevenueCat (subscription management), and — only when you use the cloud AI coach — Cloudflare (secure proxy) and Google (Gemini AI).
Data Security
Your on-device data is protected by your device's security features (passcode, Face ID, Touch ID) and iOS sandboxing. Any iCloud data is protected by your Apple ID and Apple's encryption. AI coach requests are transmitted over encrypted connections.
Data Retention & Deletion
Because your data lives on your device and, optionally, in your private iCloud, you can delete it at any time by uninstalling the app and removing Zuva's data from your iCloud settings.
Children's Privacy
Zuva is not directed to children under 13, and we do not knowingly collect personal information from children.
Changes to This Policy
We may update this Privacy Policy from time to time. We will post any changes on this page and update the date below.
Contact Us
If you have questions about this Privacy Policy, contact us at info@one4studio.com
Last updated: July 2026
