# ET2900 vs Behavioral Concepts

The clearest difference is iOS requirement: ET2900 at 13.0 against Behavioral Concepts's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ET2900 ships an update every 10 days, Behavioral Concepts every 2 weeks. The most recent releases landed on May 17, 2026 and August 19, 2026 respectively.

## The numbers

| Metric | ET2900 | Behavioral Concepts |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 10 days** | Every 2 weeks |
| Size | 50 MB | 60 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 17+ |
| Developer | [Launch Tech Co., Ltd](https://appshunter.io/developer/447568418) | [Mike Lucas](https://appshunter.io/developer/1123081185) |

## What reviewers say

### ET2900

[App page](https://appshunter.io/ios/app/et2900/id6475763943)

**In-app purchases:** none


### Behavioral Concepts

[App page](https://appshunter.io/ios/app/behavioral-concepts/id6482988752)

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

**In-app purchases:** none


## Frequently asked questions

### Is ET2900 free?

ET2900 is free to download, with no in-app purchases.

### Is Behavioral Concepts free?

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

### Do ET2900 or Behavioral Concepts have ads?

Neither ET2900 nor Behavioral Concepts shows ads.

### Which is updated more often, ET2900 or Behavioral Concepts?

ET2900 ships an update every 10 days, and Behavioral Concepts every 2 weeks. Most recently, ET2900 was updated on May 17, 2026 and Behavioral Concepts on August 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.*