# Lie Detector by the Expression — Discover the Lie and truth

> Facial expression analysis app to detect deception based on psychological studies. (iPhone/iPad app by Jorge Gregorio Martin Bello.)

- Source: https://appshunter.io/ios/app/lie-detector-by-the-expression/id1418456153 (this page in markdown: same URL + `.md`)
- Developer: [Jorge Gregorio Martin Bello](https://appshunter.io/developer/567988393)
- Category: Utilities, Entertainment
- Price: Free with in-app purchases
- Rating: 4.20/5 from 60 App Store ratings · 23 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 40 MB
- Languages: American English
- Released: 2018-09-07
- Data updated: 2026-06-11
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/lie-detector-by-the-expression/id1418456153/reviews.md

## What is Lie Detector by the Expression?

Discover this lie detector that tracks the face expressions to know when someone tells a lie. Based in real psychology studies. 

"Lie Detector by the Expression" is based in live real tracking of the face.

This app is able to track the eyes movement, lips and face shape to compare with nine different expressions that unconsciously make people when they lie.

Instructions:
Record the face of the user you want to track face and press record button.
Ask him a question while you are recording the face.
Press Stop button when the answer finishes and you will get instantly the result: Lie or True.

Of course the result depends on the ability of user to keep a neutral face while answering.

The result is not totally reliable, but is is based in real psychology studies. 

The expressions that are studied to determine the result are:

1) Eyes darting: People´s eyes usually dart back and forth when they feel uncomfortable.

2) Rapid Blinking: When people are stressed about lying, they may blink five or six times in rapid succession.

3) Closing eyes for more than one second at a time: People often close their eyes for more than a second at a time when they are lying.

4) Looking up to the right: Right-handed people usually look up to their right when they are about what they saw.

 5) Looking directly to the right: Right-handed people look directly to their right when lying about what they heard.

6) Looking down to the right: Right-handed people often look down to their right when they are lying aout smells or sensations.

7) False smile: A false smile do not affect the eyes and it´s just done with the mouth.

8) Pursed lips: People may purse their lips to counteract the dry mouth that comes when lying.

9) Head shaking: If people shake their heads while saying something, they have just denied their statement.

Download now "Lie Detector by the Expression" and do not try lie!

## Key features

- Real-time facial tracking
- Analyzes eye movement, lips, and face shape
- Detects nine common deception expressions
- Based on psychological studies
- Instant lie or truth results
- Record video for analysis

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlimited time | $1.99 | one-time |


## Recent user reviews (10 of 23)

All indexed reviews: https://appshunter.io/ios/app/lie-detector-by-the-expression/id1418456153/reviews.md

### 4/5 — Amazing

*2023-04-19, version 1.6*

This sounds to be second to none

### 5/5 — It proves to be a strong asset

*2022-02-21, version 1.6*

The truth is as of now it has been completely accurate I know because I had it tested on myself, it was on the money.!!!!

### 5/5 — Accurate.

*2021-12-11, version 1.6*

I tried it on my brother when he said he was going to give the candy cane back to my baby brother but he was wrong and the lie detector said he was wrong.

### 5/5 — H

*2021-09-07*

I

### 5/5 — Awesome

*2021-06-19, version 1.6*

It’s worked when I tried it so far so good no complaints

### 4/5 — Surprised!!

*2020-12-21, version 1.6*

Pretty good app!  Thought it was just a game....until it caught me in a lie!!

### 5/5 — The Truth!!

*2020-12-13, version 1.6*

It works, it really works! I have tried it on 5 different people and it did what it says it would!

### 5/5 — Not bad at all and better than similar apps

*2020-03-26, version 1.6*

Upon initial use of this app it seems very promising. Let’s face it, lie detector apps by and large aren’t as reliable as we’d all like but some do deliver and this is one of those in my view. Compared to another legit app I have used, called Verity, this one is better.

### 5/5 — Great app

*2020-03-15, version 1.6*

Really fun ruined a few friends marriages caught my dog lying and got out of a ticket all hokes aside like this app a lot would recommend

### 1/5 — THESE REVIEWS ARE ALL FAKE plz read 👎🏻😡

*2020-02-03, version 1.6*

I download this thinking it was true from all the good reviews. They all rated 5 star and contained of 1 o 2 words like “ great” or  “love this” but there was 1 bad one... I ignored the bad one and downloaded it. I tried it on my brother and it was accurate on lie I asked him did you lie and he confessed. I got excited and tried it on me. He asked the question and it said lie but it was TRUE. I thought “ maybe it heard it wrong” so we tried a different question and again it said LIE. So I got very angered and offloaded it. EVERY REVIEW IS PROBABLY BY THE SAME PERSON OR FAMILY!!!!!!!!!!!  Unless there is a professional at your house to give a lie test, every app is fake even the $ ones! So plz stop wasting time looking for a “real” lie detector app and hire a professional if you want one so bad. Thank you and plz take my advice

## Frequently asked questions about Lie Detector by the Expression

### What does the Lie Detector by the Expression app do?

This app uses real-time facial tracking to analyze a person's expressions and detect potential deception. It monitors eye movements, lips, and face shape, comparing them against nine expressions commonly associated with lying, drawing on principles from psychological studies.

### How does the app determine if someone is lying?

The app records a subject's face while questions are asked. It then analyzes specific facial cues like eye darting, rapid blinking, prolonged eye closure, specific eye movements, false smiles, pursed lips, and head shaking to determine if the subject is exhibiting signs of deception.

### Is the lie detection result completely reliable?

The app states that the results are not totally reliable and depend on the user's ability to maintain a neutral face. While based on real psychology studies, it is presented as a tool for exploration rather than definitive proof.

### What are the common use cases for this app?

This app can be used for entertainment, informal social experiments, or to explore the psychological indicators of deception in a fun and engaging way. It allows users to record and analyze facial expressions during conversations or questioning.

### Is this app free to use?

The application is free to download and use, but it does offer in-app purchases. This suggests that some features or advanced functionalities might be unlocked through these purchases.

## Version history (last 2 releases)

### 1.6 — 2018-11-25

New icon.
New name.

### 1.2 — 2018-09-06

No release notes.

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All apps by Jorge Gregorio Martin Bello: https://appshunter.io/developer/567988393

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-11.*