Privacy
Updated 19 July 2026
The short version: Sylph collects nothing.
What we don't collect
There are no accounts, no analytics, no crash reporting, and no advertising or tracking SDKs. Your settings, saved custom patterns and technique choices stay in private on-device storage and vanish on uninstall.
Buying Sylph Pro
The one-time purchase is handled entirely by Google Play's billing client — we never see your payment details. Google's handling is covered by Google's privacy policy. The app keeps only an on-device record that Pro is unlocked.
Casting to your TV
If you cast, your phone talks to your own Chromecast on your home network and the TV loads the display page from our website. That connection exists only while you cast, and nothing about it is logged or collected.
Permissions
Sylph never shows you a permission prompt. Like any Android app that includes Google Play billing and Google Cast support, its manifest includes standard install-time entries — internet access, network state, and vibration for the haptics. None of these involve a prompt and none touch your personal data.
This website
No cookies, no analytics. An anonymous view counter counts page loads only — it stores no IP addresses and no identifiers.
Changes
Material changes appear on this page with a new date.