# TSF by MIT vs Lie Detector

The clearest difference is in-app purchases: TSF by MIT at none against Lie Detector's 3. TSF by MIT also leads on update cadence (every 2 days vs every 6 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

Both are free to download. Lie Detector sells 3 in-app purchases, starting at $7.99 per 7 days. TSF by MIT asks for nothing beyond the download.

TSF by MIT ships an update every 2 days, Lie Detector every 6 weeks. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | TSF by MIT | Lie Detector |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.2 (32 ratings)](https://appshunter.io/ios/app/lie-detector-use-voice-test/id6747712962/reviews)** |
| Number of ratings | — | **32** |
| Positive reviews | — | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 2 days** | Every 6 weeks |
| Monetization | — | Free with in-app purchases |
| Size | 205 MB | 35 MB |
| Requires iOS | **15.5** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mohamed Fekih-Romdhane](https://appshunter.io/developer/1446960678) | [Alena Kislova](https://appshunter.io/developer/1869426091) |

## What reviewers say

### TSF by MIT

[App page](https://appshunter.io/ios/app/tsf-by-mit/id6747580301)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lie Detector

[App page](https://appshunter.io/ios/app/lie-detector-use-voice-test/id6747712962)

This app simulates a lie detection test using fingerprint scanning and voice analysis to determine if someone is telling the truth or lying. It's designed for entertainment, offering a fun way to challenge friends or spice up game nights with instant results and realistic effects.

**Highlights:** Fingerprint scanning lie detection, Voice analysis simulation, Instant truth/lie results, Realistic animations and sound effects, Manual outcome control, No sign-up required

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Week subscription | $7.99 | per 7 days |
| Premium | $7.99 | per 7 days |
| Premium | $49.99 | per year |


## Frequently asked questions

### Is TSF by MIT free?

TSF by MIT is free to download, with no in-app purchases.

### Is Lie Detector free?

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

### Do TSF by MIT or Lie Detector have ads?

Neither TSF by MIT nor Lie Detector shows ads.

### Which is updated more often, TSF by MIT or Lie Detector?

TSF by MIT ships an update every 2 days, and Lie Detector every 6 weeks. Most recently, TSF by MIT was updated on October 25, 2026 and Lie Detector on October 24, 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.*