# Lie Detector vs Polygraph AI

The clearest difference is in-app purchases: Polygraph AI at none against Lie Detector's 1. Polygraph AI also leads on update cadence (every 2 days vs every 6 days). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Lie Detector sells 1 one-off in-app purchase. Polygraph AI asks for nothing beyond the download.

Lie Detector ships an update every 6 days, Polygraph AI every 2 days. The most recent releases landed on October 19, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Lie Detector | Polygraph AI |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Every 6 days | **Every 2 days** |
| Size | 63 MB | 31 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [AMARDEEP DHILLON](https://appshunter.io/developer/999752727) | [Andres Saiz Ruiperez](https://appshunter.io/developer/6781788677) |

## What reviewers say

### Lie Detector

[App page](https://appshunter.io/ios/app/lie-detector-face-scanner/id6762190053)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove ads | $2.99 | one-time |


### Polygraph AI

[App page](https://appshunter.io/ios/app/polygraph-ai-lie-analysis/id6796011746)

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

**In-app purchases:** none


## Frequently asked questions

### Is Lie Detector free?

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

### Is Polygraph AI free?

Polygraph AI is free to download, with no in-app purchases.

### Do Lie Detector or Polygraph AI have ads?

Both Lie Detector and Polygraph AI show ads.

### Which is updated more often, Lie Detector or Polygraph AI?

Lie Detector ships an update every 6 days, and Polygraph AI every 2 days. Most recently, Lie Detector was updated on October 19, 2026 and Polygraph AI on October 17, 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.*