Let's be clear: this is a prank app, not a scientific instrument. As a tool for messing with your friends, itβs functional and has some fun visual flair. The app uses 'fingerprint scanning' (simulated by holding your thumb on the screen) to determine if someone is lying. The trick, of course, is that the user can secretely control the result using hidden buttons or volume keys.
Itβs a novelty that wears off after about five minutes. The graphics are decent, attempting to look like a high-tech polygraph, and the sound effects add to the tension. However, itβs plagued by ads and doesn't offer much beyond the core gimmick. If you're looking for a quick laugh at a party, it's fine, but don't expect any depth or actual 'gameplay.'
Available on: iPhone, iPad, iPod
Version Invalid Date
Use Lie Detector Prank to test if your friends lie or tell the truth. Lie Detector Test scans your finger print and determines TRUE(real), FALSE (lie).
Tap and hold your finger on the lie detector machine. After detection, Lie detector will test lies based on your finger print.
Requires iOSΒ 8.0 or later. Compatible with iPhone, iPad, and iPodΒ touch.Use Lie Detector Prank to test if your friends lie or tell the truth. Lie Detector Test scans your finger print and determines TRUE(real), FALSE (lie).
Use Lie Detector Prank to test if your friends lie or tell the truth. Lie Detector Test scans your finger print and determines TRUE(real), FALSE (lie).
Tap and hold your finger on the lie detector machine. After detection, Lie detector will test lies based on your finger print.











Lie Detector Prank is a fun, social app designed for tricking friends and family. It simulates a fingerprint scanner and polygraph machine with high-tech animations and sounds. You can pre-set the results to 'Truth' or 'Lie' to control the prank. Itβs a perfect icebreaker for parties and gatherings, though it is intended purely for entertainment purposes.
Realistic polygraph UI
Customizable prank results
Vibration and sound effects
Easy-to-use interface
Before your friend puts their finger on the scanner, look for the hidden 'Secret' areas or use the volume buttons to determine whether the next result will be a Lie or the Truth.
The app displays a realistic-looking thumbprint scanner. Once the user holds their finger down, a 'calculating' animation plays followed by a loud buzzer or success chime.
No, this app is for entertainment and prank purposes only. Mobile phones do not have the hardware to perform real polygraph tests.