Privacy policy

Last updated: 12 October 2026

This policy explains what the CrossLine Android app ("CrossLine", "the app") by web2u does with information. In short: we don't collect your data. Your charts and progress never leave your phone. CrossLine has no account, no cloud, no analytics, no ads and no AI. The only time it talks to the internet is Google Play confirming your purchase (explained below).

What stays on your device

• The PDF charts you import (copied into the app's private storage), the projects created from them, your stitching progress and settings.
• Your trial start date and purchase status.

We have no servers that receive this information, and the app has no account or sign-in.

What the app does not do

• No analytics, crash reporting or advertising SDKs.
• No AI: your charts are read on your phone by plain code and are never sent to an AI or machine-learning service.
• No tracking, no advertising ID, no location, contacts, camera or microphone access.
• No selling or sharing of personal data.

Services from Google

• Google Play Billing: the one-time unlock is bought through Google Play. Google processes the payment under Google's privacy policy. The app receives only the purchase confirmation, which it checks on the device.
• Android backup: if you use Android's backup, only the trial and purchase status file is included, so a reinstall doesn't restart or lose your unlock. Your charts and progress are not backed up.

Permissions

• Files: you choose PDFs (and Pattern Keeper progress files) with Android's file picker; the app reads only the files you pick. On Android 9 and below, the app uses storage access only to save a project's PDF to Downloads when you use Download PDF.
• Internet: used only by Google Play Billing, as above. The app makes no other network connections; its fonts are built in.

Links and email

Help & guides opens this website in your browser. This site sets no cookies and uses no trackers; its fonts and images are served from this site. Send feedback opens your own email app with a message to us that includes the app version, device model and Android version; you can edit or delete these before sending. We use emails only to reply and improve the app.

Deleting your data

Delete a project in the app, or uninstall CrossLine to remove everything it stored. To have us delete an email you sent, write to crossline@web2u.dev.

Children

CrossLine isn't directed at children and collects no personal data from anyone.

Changes and contact

If this policy changes, we'll update this page and the date above. Questions: crossline@web2u.dev.