Some exclusive apps combine two fake detectors to make the prank more convincing.
If you are looking for a way to prank friends or have fun at a party, here is a breakdown of how these "exclusive" online tools generally perform based on popular versions like those found on Google Play Lie Detector Truth Test - App Store
No real "fingerprint lie detector" exists that can actually detect lies through a phone screen or online scan. All free online and mobile app fingerprint lie detector tests are intended solely for entertainment. The Reality of Fingerprint "Lie Detectors"
The primary irony of an "online fingerprint lie detector" is a hardware limitation: standard smartphone screens and computer monitors cannot scan fingerprints
