Privacy · Updated October 31, 2026
LineLatch privacy notice
LineLatch processes your selected images and calibration projects locally. It has no developer-operated account, cloud storage, advertising, analytics, or tracking service.
This notice covers the LineLatch iPhone app and its support contact. Publisher: Jason Wu · App Store seller: 志强 武.
Images and projects on your device
When you choose an image through the system Photos or Files picker, LineLatch stores the image bytes returned by the system picker in its app container. It also saves your project name, reference-point coordinates, reference length, selected unit, paper settings, and local creation and update times.
Imported images can contain embedded metadata, including camera details or a capture location. The system picker may provide a converted representation; LineLatch does not promise a bit-for-bit copy of the source Photos asset. LineLatch does not request your device location and does not automatically remove metadata already embedded in an image. It does not request access to your full photo library, contacts, microphone, or a printer account.
A system picker may obtain a selected file from your chosen cloud provider. That provider follows its own settings and privacy practices. LineLatch does not upload your image or project to the developer.
PDFs, backups, and sharing
LineLatch generates PDFs and editable project backups in app-managed temporary storage. A PDF includes the project name as its document title and page labeling. An editable backup includes the imported image, any embedded image metadata, and the project settings.
Exporting or sharing is your choice. The destination you select controls the resulting copy and may store it online. LineLatch cannot recall a copy after you save or share it to Files, cloud storage, messaging, or another destination.
Deletion and retention
Saved projects remain in the app’s local storage until you delete them or remove the app. Deleting a project removes its saved project folder, source image, and the temporary PDF and backup copies managed by LineLatch for that project. Externally saved or shared copies remain at their destinations.
Removing the app deletes its local app container. Device or operating-system backups may include app data according to your settings. LineLatch does not promise that a system backup exists or can be restored. Keep an editable project backup in a location you trust before removing important work.
App Store purchases
Apple handles the app’s download purchase and any refund through your Apple Account. This version has no in-app purchases or subscription. LineLatch does not receive your payment card details.
Support messages
If you choose to email support, your email address, message, and any attachments are handled by the email provider and used to respond to your request. The app does not automatically send diagnostics, images, backups, or support messages. Only attach private material if you want to share it for troubleshooting.
For questions about a support message you sent, contact the email address below. Local projects can be deleted inside the app; the developer cannot retrieve or remotely delete files that remain only on your device.
This support website
These pages add no analytics, advertising, forms, or tracking scripts. The website host may process network request information needed to deliver the pages under its own privacy practices. Opening an email link uses the mail app you choose; no message is sent until you send it.
Changes and contact
Updates to this notice will appear on this page with a revised date. If the app’s data handling changes, this notice must be updated to match.
Privacy and support contact: wzq12200609@gmail.com.