Now turn your screen brightness all the way downDimness matters more than colour. Red keeps your eyes adjusted; a bright red screen still undoes it.
Install Sweep to your home screenRuns offline afterwards, which matters where the signal is bad.
A newer version is readyFinish your sweep first — reloading now discards this session's checkmarks.
The full sweep assumes a room you control and twenty minutes or more. Most places you'd worry about give you neither — you can't kill the lights in a fitting room or move the furniture in a restroom stall. So these aren't shortened sweeps. Each one leads with the way to not need a sweep at all, because avoiding the exposure beats searching for the camera every time.
Everything here stays on this device. Nothing is uploaded, and nothing sends itself. You hand the record off deliberately, at the end. What's stored, exactly.
Use your phone's own camera app, not this page. A photo taken in the Camera app lands in your camera roll carrying EXIF metadata — the model, the timestamp, often the location — and it survives the phone dying. A picture captured inside a web page carries none of that and is worth much less later. Take the photos, then log them here.
Off unless you turn it on. Read the notice before you do.
Written as you go, and saved to this device after every entry.
These apply from the first minute, not just at the end. You may find something on step 02.
Hold the phone so the light sits as close to your eye line as you can. A lens only throws its reflection straight back along the beam.
Front cameras on many phones can see the infrared LEDs a camera uses for night vision. Calibrate first: point a TV remote at the front camera and press a button. A purple or white flash means it works.
The most common mistake is not knowing what you're hunting. A lens returns a small, hard point that snaps on and off as you move. A reflection off chrome or glass smears and slides.
The sweep code, the timeline, evidence logging and the hand-off controls live under Record in the top bar.