Trip Wire: Motion Alarm

Contains ads
29 reviews
Content rating
Everyone
5K+
Downloads
Content rating
Everyone
Learn more
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About this app

Trip Wire turns your Android phone into an invisible laser trip wire. Point the camera at a doorway, a hallway or your desk, tap Activate, and an alarm sounds every time something moves in view.

GREAT FOR
• Finding out who sneaks into your room or raids the fridge
• Hearing when someone comes through the door
• Pranks and party games
• Keeping an eye on pets

KEEPS WATCHING IN THE BACKGROUND
• Keeps working when you leave the app or turn off the screen
• An ongoing notification shows how many times the wire has been tripped
• A countdown gives you time to step out of view before it starts

9 ALARM SOUNDS
Airhorn, alarm, bomb, buzzer, cat meow, ding, dog bark, gunfire and mad cow, with adjustable volume and a test button.

MAKE IT FIT YOUR SPACE
• Sensitivity: from very low to super high
• Time between sounds: from 0.1 to 60 seconds
• Noise reduction to ignore flicker and small changes
• Front or back camera
• Live preview to aim the camera

PRIVATE BY DESIGN
The camera image is analysed only on your phone. Nothing is recorded, saved or uploaded, and no account is needed.

Trip Wire is available in 26 languages. It is free and shows a small banner ad. You can change your ad privacy choices at any time from Privacy settings in the app.
Turn your phone into an invisible trip wire that sounds an alarm on motion.
Updated on
Oct 30, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Location, App activity and 2 others
  • This app may collect these data types
    Location, App activity and 2 others
  • Data is encrypted in transit

Ratings and reviews

27 reviews
A Google user
December 21, 2018
Couldn't find the camera on my S5. Tried rebooting and reinstall. Would like to try it again.
3 people found this review helpful
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A Google user
January 18, 2019
could not find camera. trash app
2 people found this review helpful
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A Google user
July 8, 2019
Could not find camera. P20pro.
3 people found this review helpful
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What’s new

Version 4.1: Completely redesigned with a new look and icon. Modern camera system with more reliable detection, works in the background on the latest Android versions, a sound test button and 25 new languages.