Privacy Policy
SmileLock
This privacy policy explains how SmileLock ("the App") handles user information.
1. Basic Policy
The App does not collect personal information (name, email address, phone number, location, contacts, etc.). It has no server of its own and no user accounts. Everything the App records stays on your device. There are no analytics SDKs, no advertising SDKs, and no third parties receiving your data.
2. Camera and Face Data
The App uses the front camera to detect a smile. Detection runs through Apple's ARKit face tracking framework on the device itself.
- What is read: the App reads expression values from ARKit's BlendShapes API in real time (numbers from 0.0 to 1.0 representing mouth corner movement and cheek raise). No 3D face model, depth map, or image of your face is stored
- Purpose: the values are used only to judge whether you are smiling and to calculate a score
- Retention: face data exists only for the moment it is processed and is discarded immediately. Nothing is written to disk
- Transmission: camera footage and face data are never sent anywhere
- No advertising or marketing use: face data is never used for advertising, marketing, or data mining
- Permission: camera access requires your explicit consent through the iOS permission dialog. You can revoke it at any time in Settings
3. Smile Logs
Each successful smile check is recorded on your device with the date and time, the two scores, which flow triggered it, and whether you chose not to open the app afterwards. These records power the History screen.
- Storage: on your device only, using SwiftData. The App does not sync them to iCloud or to any server
- Deletion: you can delete every record from Settings at any time. Deleting the App also removes them
4. Screen Time (Family Controls)
To switch a locked app to a smile check after overuse, SmileLock uses Apple's Screen Time frameworks (FamilyControls, ManagedSettings, DeviceActivity) with .individual authorization, meaning you are managing your own device.
- App selection: the apps you choose are handed to the App by Apple as opaque tokens. The App cannot read which apps they are, and cannot see what else you have installed
- Usage time: the system measures how long a selected app has been used and notifies the App only when your chosen interval is reached. The App never receives a usage history
- Scope: this authorization applies to your own device only and can be turned off at any time in Settings
5. Notifications
The App sends local notifications to guide you back to the smile check after overuse. They are generated on your device. No push server is involved and no device token leaves your phone.
6. Network Communication
The App has no backend. It does not send or receive data over the network, apart from the standard communication Apple's own frameworks perform.
7. Purchases
The App is free and offers no in-app purchases.
8. Children's Privacy
The App is designed for users managing their own device and is not directed at children under 13. It does not knowingly collect information from children.
9. Changes to This Policy
This policy may be updated as the App changes. The date below shows the latest revision.
10. Contact
For questions about this policy, please contact us at:
Email: sago3.app@gmail.com
Last updated: August 15, 2026