# SEIMON vs Lie Detector

The clearest difference is ads: SEIMON at none against Lie Detector's shown. Lie Detector's advantage is update cadence (every 6 days vs every 3 weeks) and iOS requirement (15.6 vs 17.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. SEIMON sells 2 in-app purchases, starting at $3.99 per month and Lie Detector sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SEIMON ships an update every 3 weeks, Lie Detector every 6 days. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | SEIMON | Lie Detector |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Size | 5 MB | 63 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Takahiro Endo](https://appshunter.io/developer/1878005918) | [AMARDEEP DHILLON](https://appshunter.io/developer/999752727) |

## What reviewers say

### SEIMON

[App page](https://appshunter.io/ios/app/seimon/id6762163853)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 上級鑑定士ライセンス（月額） | $3.99 | per month |
| 上級鑑定士ライセンス（年額） | $29.99 | per year |


### 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 |


## Frequently asked questions

### Is SEIMON free?

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

### Is Lie Detector free?

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

### Do SEIMON or Lie Detector have ads?

Lie Detector shows ads; SEIMON does not.

### Which is updated more often, SEIMON or Lie Detector?

SEIMON ships an update every 3 weeks, and Lie Detector every 6 days. Most recently, SEIMON was updated on October 24, 2026 and Lie Detector on October 19, 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.*