Privacy Policy

Photos and permissions

No account is required. Photo processing and comparison creation take place on your device. Teacho does not upload photos or modify or delete originals. Comparisons you choose to save are added as new images in Photos. When browsing, iCloud photos may be downloaded through the system. Manage photo, camera and notification permissions in system Settings. With limited photo access, Teacho can access only the photos you select.

On-device reminders

Daily reminders are optional and require notification permission and either full or limited photo access. Teacho uses photo creation dates to find images taken on the same month and day in past years within the photos you allow it to access. A local notification is scheduled only after confirming that memories exist for today and before your chosen reminder time. No new memory notification is scheduled when no matching photos are found or photo access is unavailable.

To prepare notification wording, Teacho analyzes up to six photo thumbnails on your device for coarse scenes such as cats, flowers and landscapes. This process does not download iCloud originals for reminders. When available, the on-device language model receives only scene labels, preset wording and language instructions to refine the sentence; it does not receive photos. Preset wording is used if recognition or generation fails. This feature does not upload photos, photo identifiers, scene labels or generated wording to a server and does not use a cloud model.

Notifications can be prepared while the app is open or when iOS permits background execution. The app requests background refresh after midnight, but iOS does not guarantee when it will run. After you force-quit the app from the App Switcher, the current background refresh task cannot relaunch it. If the photo query cannot finish before your reminder time, no new reminder is scheduled for that day and no catch-up reminder is sent. Local notifications already scheduled with the system may still appear.

Reminder preferences, notification wording, and photo identifiers, modification dates and scene classification results used to reuse results are stored locally. Past wording caches are cleared when wording is prepared; the scene classification cache holds up to 120 entries. Scene descriptions may appear in Lock Screen notifications. Manage previews in system notification settings.

Local data and support

Turning off daily reminders cancels future background analysis tasks and removes pending and delivered memory notifications. It does not also delete saved preferences, wording or scene caches. Revoking photo permission prevents further photo access but does not automatically clear those caches. Deleting the app removes its local data; manage images saved to Photos separately. When you email support, we use the email address and message you provide to answer your request. Contact realsidney@qq.com for data requests.

Usage analytics and diagnostics

The current version includes no third-party usage analytics or crash reporting SDK.

Website and third parties

This website is hosted by GitHub Pages, whose provider may process access logs including IP addresses. These pages add no analytics or advertising scripts. This policy is updated when features or data practices change.