Define a precise watch area
Draw a rectangle around the content you care about. Exclude timestamps, clocks, or other constant motion with ignore areas.
Screen monitoring
NX Sentry.
Watch the part that matters.
Select a region of a camera, screen, or window. Sentry watches for changes and sounds an alarm, so you can turn your attention elsewhere.
01 — CAPABILITIESNX SENTRY
Tune what counts as change
Adjust sensitivity, consecutive frames, grace periods, and quiet time. Zoom and pixel-exact mode support small targets that need a closer look.
Know what triggered it
Choose an alarm and its output device. Review annotated trigger snapshots to see the changed region; snapshots stay in memory unless you enable disk saving.
02 — GETTING STARTED
From download to first use.
Requirements and setup vary by project. The repository documentation is the source for complete instructions.
Read the documentation ↗- 01
Install and choose a source
Get the Linux AppImage from Releases or install through NX Hub. Choose a camera, screen, or window to watch.
- 02
Frame the region
Drag your watch rectangle and add ignore areas where needed. On Wayland, approve screen sharing in the desktop portal.
- 03
Check the alarm and arm
Choose your output device, run Sound check, and start watching. Adjust the thresholds if background motion triggers too often.
PLATFORM & SETUP
The published build is a Linux AppImage. Wayland screen capture needs PipeWire and a working desktop portal; Linux camera capture uses V4L2.
CURRENT SCOPE
The pointer can trigger changes. If screen sharing is revoked, Sentry disarms and reports the ended capture.
Keep going.
Documentation, development, and help.