# ТЕТ vs Детектор Лжи I.S.L

The clearest difference is price: ТЕТ at Free against Детектор Лжи I.S.L's $8.99. ТЕТ also leads on ads (none vs shown) and ratings volume (60 vs 4). Детектор Лжи I.S.L's advantage is review sentiment (86% vs 47%). On rating, update cadence, in-app purchases and device support there is nothing between them.

ТЕТ is free to download; Детектор Лжи I.S.L costs $8.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Детектор Лжи I.S.L holds the better App Store score, 4.0 against 3.8. That said, the two scores are not equally well evidenced: ТЕТ has 60 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 47% of ТЕТ's written reviews are positive against 86% of Детектор Лжи I.S.L's.

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ТЕТ | Детектор Лжи I.S.L |
| --- | --- | --- |
| Price | **Free** | $8.99 |
| Rating | [3.8 (60 ratings)](https://appshunter.io/ios/app/id1594326960/reviews) | **[4.0 (4 ratings)](https://appshunter.io/ios/app/isl/id1611247031/reviews)** |
| Number of ratings | **60** | 4 |
| Positive reviews | 46.7% of reviews | **85.7% of reviews** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | **Free** | Free with in-app purchases |
| Size | 55 MB | 81 MB |
| Requires iOS | **12.1** | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 9+ |
| Developer | [NAFI.Research Center](https://appshunter.io/developer/1601263156) | [ALGORITHM LLC apps](https://appshunter.io/developer/1459520987) |

## What reviewers say

### ТЕТ

[App page](https://appshunter.io/ios/app/id1594326960)

Participate in public opinion surveys and earn rewards. Your answers help organizations make strategic decisions. Rewards can be withdrawn to a bank card or mobile phone account.

**Highlights:** Participate in opinion surveys, Earn rewards for participation, Withdraw rewards to bank card, Withdraw rewards to mobile account, Help organizations make decisions

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

**In-app purchases:** none


### Детектор Лжи I.S.L

[App page](https://appshunter.io/ios/app/isl/id1611247031)

This app uses unique technologies and physiological data to estimate the likelihood of deception. It is intended for entertainment purposes only and is not a professional lie detector. Users must obtain consent before testing.

**Highlights:** Estimates deception using physiological data, Developed with professional psychologists, Entertainment purposes only, Requires user consent for testing, Not a professional polygraph

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ТЕТ free?

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

### Is Детектор Лжи I.S.L free?

Детектор Лжи I.S.L costs $8.99, with no in-app purchases.

### Which has better reviews, ТЕТ or Детектор Лжи I.S.L?

Детектор Лжи I.S.L is rated higher. ТЕТ averages 3.8 out of 5 from 60 ratings, while Детектор Лжи I.S.L averages 4.0 from 4 ratings.

### Do ТЕТ or Детектор Лжи I.S.L have ads?

Детектор Лжи I.S.L shows ads; ТЕТ does not.

### Which is updated more often, ТЕТ or Детектор Лжи I.S.L?

ТЕТ ships an update every 5 months, and Детектор Лжи I.S.L every 5 months. Most recently, ТЕТ was updated on October 24, 2026 and Детектор Лжи I.S.L on October 12, 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.*