Shutterguard

Scenarios

The home screen offers six kinds of places, each with a suggested scan time and order, and the scan screen prompts you step by step. This page describes app version 1.1, whose interface is currently in Traditional Chinese only.

Before you scan

  • Close the curtains or turn off the lights. The darker the room, the clearer lens reflections are; infrared detection needs full darkness.
  • Move the phone slowly and follow the suggested order one spot at a time.
  • When a suspicious bright spot appears, move to about 30 cm and check again from another angle.
  • Results only list what was found. Finally, check with your own eyes what is actually there.

Six kinds of places

After you pick a place, the scan screen prompts you in this order.

Hotel / motel / Airbnb

60–120 sec
  1. Above the bed
  2. TV area
  3. AC panel
  4. Smoke detector
  5. Bathroom ceiling

Fitting room

20–30 sec
  1. Ceiling corners
  2. High on walls
  3. Hook locations
  4. Inside the cabinet

Restroom stall

15–20 sec
  1. Above the partitions
  2. Around the tissue box
  3. Toilet tank
  4. Hook locations

Clinic / spa / massage

30–60 sec
  1. Directly above the exam bed
  2. Smoke detector and vents
  3. Curtain rods and tracks
  4. Equipment shelves

Rental / move‑in check

120–180 sec
  1. Outlets and power strips
  2. Clock and decor
  3. Router and set‑top box
  4. Air conditioner and smoke detector
  5. Around the TV
  6. High on bookshelves

Quick ceiling scan

15–30 secHold the phone up and turn around once
  1. Directly overhead
  2. Smoke detector
  3. Vents
  4. Sprinklers and recessed lights

Objects that have been used to hide cameras

Seeing one of these doesn't mean something is wrong. Slow down, change angle, and look for unusual tiny holes or mirror‑like reflections.

Smoke detector / fire alarm

Common spots: Center of the ceiling, directly above the bed or toilet

What to look for: Extra tiny holes or glassy reflections, pointing at key areas, an unusual brand or position

Outlet / USB charger / power strip

Common spots: Bedside, wall outlets, desk power strips

What to look for: A small dark dot or reflection next to the sockets, a plugged‑in charger that doesn't charge, an unexplained standby light

Clock / alarm clock / Bluetooth speaker

Common spots: Nightstand, desk, shelves

What to look for: A small round hole in the front, angled at the bed, a faint lens dot while on standby

Router / network box / TV box

Common spots: Desk, TV cabinet, corners

What to look for: A lens hole in a seam or next to the lights, extra unexplained cables

Hook / coat hook

Common spots: Behind doors, changing and fitting room walls

What to look for: A tiny hole at the bottom or at the screw, facing the changing area

Air purifier / dehumidifier / decor

Common spots: Floor corners, shelves, desks

What to look for: Odd openings in vents or panels, glassy reflections on picture frames, tissue boxes or plush toys

Screw holes, vents, picture frames, tissue boxes and plush toys have also been used. When pointing at these, slow down and look again from an angle of 30 to 60 degrees.

Mirrors

Press a fingernail against the mirror and look at the gap between your nail and its reflection: an ordinary mirror shows a gap, while a two‑way mirror shows none. A two‑way mirror is also usually 1 to 2 cm thicker than a regular one of the same style.

Shutterguard is an assistive tool and cannot guarantee that every hidden camera will be found. If you have concerns, contact local police, report it to the booking platform or tell the venue's management, and take photos first to keep a record. How each method works is explained on Detection methods.