# Ace Lie Detector Polygraph vs Lie Detector Finger Scan

The clearest difference is rating: Lie Detector Finger Scan at 4.0 against Ace Lie Detector Polygraph's 3.1. Lie Detector Finger Scan also leads on monetization model (free vs free with in-app purchases). Ace Lie Detector Polygraph's advantage is ads (none vs shown) and update cadence (every 4 weeks vs every 3 months). On price, review sentiment, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Ace Lie Detector Polygraph sells 1 one-off in-app purchase and Lie Detector Finger Scan sells 10 in-app purchases, starting at $1.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Lie Detector Finger Scan holds the better App Store score, 4.0 against 3.1. Both are backed by a comparable volume of ratings — 18 and 8 respectively. Written reviews complicate that: 37% of Ace Lie Detector Polygraph's written reviews are positive against 33% of Lie Detector Finger Scan's, so the app with the better star average is not the one people write more warmly about.

Ace Lie Detector Polygraph ships an update every 4 weeks, Lie Detector Finger Scan every 3 months. The most recent releases landed on November 1, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Ace Lie Detector Polygraph | Lie Detector Finger Scan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (18 ratings)](https://appshunter.io/ios/app/ace-lie-detector-polygraph/id425093062/reviews) | **[4.0 (8 ratings)](https://appshunter.io/ios/app/lie-detector-finger-scan/id1116394384/reviews)** |
| Number of ratings | **18** | 8 |
| Positive reviews | **36.9% of reviews** | 33.3% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 weeks** | Every 3 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 15 MB | 12 MB |
| Requires iOS | **8.0** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Tiny Mobile Inc.](https://appshunter.io/developer/360543132) | [Sandeep Bhandari](https://appshunter.io/developer/794284640) |

## What reviewers say

### Ace Lie Detector Polygraph

[App page](https://appshunter.io/ios/app/ace-lie-detector-polygraph/id425093062)

This entertainment app simulates a lie detector for fun. Use its visual technology to "detect" truths from friends and family. Upgrade to manipulate results for jokes.

**Highlights:** Simulated lie detection, TruthWave™ visual technology, Live data display, Result manipulation for jokes, Impress and intimidate friends

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lie Detector Upgrade - Lie Detection special | $0.99 | one-time |

**What reviewers like**

- 🚀 Straight awesomeness
- 👍 Funny and entertaining
- 🤖 Surprisingly accurate at times

**What reviewers complain about**

- 🐛 Inconsistent results
- 💤 Boring and not very useful
- 🤷‍♀️ Doesn't actually work as a lie detector

**Reported bugs**

- App loads upside down on some devices
- Upgrade doesn't work as expected

**Requested features**

- Ability to record audio for more accurate detection
- Option to customize the detection logic


### Lie Detector Finger Scan

[App page](https://appshunter.io/ios/app/lie-detector-finger-scan/id1116394384)

This entertainment app simulates a lie detector using fingerprint scanning. Prank friends and family by making them believe you can detect if they are lying. It offers preset truth or lie answers or random results for fun.

**Highlights:** Fingerprint scanner simulation, Preset truth/lie answers, Random result mode, Realistic animations and sounds, Prank friends and family

**Features:** macOS Compatibility, Family Sharing

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Subscription | $1.99 | per 7 days |
| Monthly Subscription | $4.99 | per month |
| Pro Weekly | $4.99 | per 7 days |
| Yearly Subscription Discount | $14.99 | per year |
| Yearly Subscription Sale | $14.99 | per year |
| Yearly Subscription Special | $19.99 | per year |
| Yearly Subscription | $29.99 | per year |
| Pro Annual | $29.99 | per year |
| Forever Pro Discount | $79.99 | one-time |
| Forever Pro | $99.99 | one-time |


## Frequently asked questions

### Is Ace Lie Detector Polygraph free?

Ace Lie Detector Polygraph is free to download, with in-app purchases available.

### Is Lie Detector Finger Scan free?

Lie Detector Finger Scan is free to download, with in-app purchases available.

### Which has better reviews, Ace Lie Detector Polygraph or Lie Detector Finger Scan?

Lie Detector Finger Scan is rated higher. Ace Lie Detector Polygraph averages 3.1 out of 5 from 18 ratings, while Lie Detector Finger Scan averages 4.0 from 8 ratings.

### Do Ace Lie Detector Polygraph or Lie Detector Finger Scan have ads?

Lie Detector Finger Scan shows ads; Ace Lie Detector Polygraph does not.

### Which is updated more often, Ace Lie Detector Polygraph or Lie Detector Finger Scan?

Ace Lie Detector Polygraph ships an update every 4 weeks, and Lie Detector Finger Scan every 3 months. Most recently, Ace Lie Detector Polygraph was updated on November 1, 2026 and Lie Detector Finger Scan on November 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*