Effective date: 2026-07-07 · Applies to the Night Lock Android app (com.russell.nightlock)
The short version: Night Lock collects nothing, sends nothing, and has no
internet access. Everything the app does happens entirely on your device.
Information we collect
None. Night Lock does not collect, store off-device, transmit, or share any
personal information. It has no user accounts, no analytics, no advertising, and no third-party
SDKs or libraries.
No network access
The app does not request the Android INTERNET permission. It is technically
incapable of sending data anywhere. There is no server and no cloud component. This can be
verified by inspecting the app's manifest.
What stays on your device
Your passphrase is never stored. When you set one, the app saves only a
one-way cryptographic hash of it (PBKDF2-HMAC-SHA256 with a random per-install salt), kept in
Android's private, app-sandboxed storage. The passphrase itself cannot be recovered from it.
Your schedule settings (guard start/end times) are saved in the same
private app storage.
None of this is included in Android backups — the app sets allowBackup="false".
Permissions and why they're used
Device administrator (screen lock only): to lock the screen on your
schedule and on demand. It is used solely for the force-lock function — never to wipe data,
reset a password, or read any content.
Display over other apps: to show the passphrase prompt on top of the screen
during your guard hours.
Notifications, exact alarms, run-at-boot, foreground service: to keep the
scheduled lock accurate and running.
None of these permissions are used to collect or transmit information.
Children
Night Lock is a general-purpose privacy utility and is not directed at children. It collects no
data from anyone, including children.
Data deletion
Because nothing is collected or stored off your device, there is nothing for us to delete.
Uninstalling the app removes the locally stored passphrase hash and settings from your phone.
Changes to this policy
If this policy ever changes, the updated version will be posted at this URL with a new effective
date.