# Cortex DigiTUS vs ERU

The clearest difference is in-app purchases: ERU at none against Cortex DigiTUS's 1. ERU also leads on iOS requirement (13.0 vs 16.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Cortex DigiTUS sells 1 one-off in-app purchase. ERU asks for nothing beyond the download.

Cortex DigiTUS ships an update every 5 weeks, ERU every 4 weeks. The most recent releases landed on October 27, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Cortex DigiTUS | ERU |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 4 weeks** |
| Size | 121 MB | 23 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [TUSDATA Anonim Sirketi](https://appshunter.io/developer/483455635) | [Erciyes University](https://appshunter.io/developer/1679301796) |

## What reviewers say

### Cortex DigiTUS

[App page](https://appshunter.io/ios/app/cortex-digitus/id6471902178)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Cortex Paketi | $199.99 | one-time |


### ERU

[App page](https://appshunter.io/ios/app/eru-tip-ots/id6477384539)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Cortex DigiTUS free?

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

### Is ERU free?

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

### Do Cortex DigiTUS or ERU have ads?

Neither Cortex DigiTUS nor ERU shows ads.

### Which is updated more often, Cortex DigiTUS or ERU?

Cortex DigiTUS ships an update every 5 weeks, and ERU every 4 weeks. Most recently, Cortex DigiTUS was updated on October 27, 2026 and ERU on October 25, 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.*