Optical camera scan
Find what's watching you.
CamFinder turns the camera you're already holding into a lens detector. Open it in the room you're standing in — no install, no upload, no account.
- No upload
- Runs on your device
- No account
Built for the four minutes after you check in
You drop the bag, and something about the room is off. That is the moment this is for. CamFinder loads in a browser tab, asks for the camera once, and gives you a repeatable sweep you can run before you've even taken your shoes off. It won't promise certainty, because nothing honest can. It gives you the two optical signals a phone can actually read, and a clear way to tell a lens from a screw head.
Signals
What a scan looks for
Three signals, all of them visible to a phone camera you already own.
Optical
Lens retroreflection
A camera lens sends light straight back where it came from. Sweep a bright light across a shelf and a hidden lens answers with a small, fixed glint that follows you.
Infrared
Emitter bloom
Night-vision cameras light the room with infrared your eyes can't see. Your phone's sensor can. It reads as a pale violet glow ringing the lens.
Placement
Sightlines
A camera has to see something to be worth hiding. The scan weights objects with a clear view of the bed, the shower door, and where you undress.
Sequence
How the scan runs
Four passes, in order. The last one is the scan's own work, not yours.
- 01
Allow the camera
The scan runs in the browser. Your phone asks once, and you can revoke it just as fast.
- 02
Sweep the room slowly
Hold the phone at chest height and pan one wall at a time. Slow beats thorough — a fast sweep skips glints entirely.
- 03
Check what it flags
Flagged points hold on screen with how long they have stayed put. Most of them will be screws, smoke sensors, or ordinary reflections.
- 04
Let it rule things out
As you move, the scan compares every flagged point against the room's own motion. A lens stays stuck to its object; a reflection slides off and gets marked as ruled out.
What four minutes actually buys you
Not certainty — a shortlist. By the end of a sweep you have looked at every object in the room with a clear view of the bed, ruled out the ones whose bright points slid away as you moved, and been left with a handful worth touching. That is a smaller and much more useful thing than a vague unease about a room you cannot unsee.
Field guide
Where cameras usually are
Hidden cameras are placed for sightlines, not for cleverness. Start with anything that faces a bed, a door, or a shower.
Hotel room
- Smoke detectors mounted above the bed
- Alarm clocks turned toward the pillow
- TV bezels and set-top boxes
- Air vents on the bathroom wall
Short-term rental
- Shelf décor with a clean line to the bed
- USB chargers and power strips
- Routers placed unusually high
- Picture frames and wall art
Changing room
- Gaps in mirror seams and trim
- Coat hooks and hanger rails
- Ceiling tiles directly overhead
- Ventilation grilles at eye level
Privacy
Nothing leaves your phone.
The scan runs entirely in your browser. Frames from your camera are read, measured, and discarded in the same moment. They are never uploaded, never stored, and never sent anywhere. There is no account, so there is nothing for anyone to request from us.
- No frames uploaded
- No account, ever
- Nothing is stored
Questions