# UNDIApp v4 vs Corbac

The clearest difference is in-app purchases: Corbac at none against UNDIApp v4's 3. UNDIApp v4's advantage is device support (3 vs 1). On price, update cadence, ads and iOS requirement there is nothing between them.

Both are free to download. UNDIApp v4 sells 3 one-off in-app purchases. Corbac asks for nothing beyond the download.

UNDIApp v4 ships an update every 6 weeks, Corbac monthly. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | UNDIApp v4 | Corbac |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Monthly** |
| Monetization | Free with in-app purchases | — |
| Size | 50 MB | 15 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [1•2•7•8 réalisation(s)](https://appshunter.io/developer/1780334658) | [Frederic Trisson](https://appshunter.io/developer/1706678387) |

## What reviewers say

### UNDIApp v4

[App page](https://appshunter.io/ios/app/undiapp-v4/id1577959494)

Manage all your intermittency benefits in one app. Track compensation, deductibles, overpayments, and recalculate your earnings. Access all the latest UNDIA information.

**Highlights:** Compensation tracking, Deductible management, Overpayment handling, Recalculation tools, UNDIA information access

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Merci | $0.99 | one-time |
| Grand merci | $2.99 | one-time |
| Énorme merci ! | $8.99 | one-time |


### Corbac

[App page](https://appshunter.io/ios/app/corbac/id6473516302)

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

**In-app purchases:** none


## Frequently asked questions

### Is UNDIApp v4 free?

UNDIApp v4 is free to download, with in-app purchases available.

### Is Corbac free?

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

### Do UNDIApp v4 or Corbac have ads?

Neither UNDIApp v4 nor Corbac shows ads.

### Which is updated more often, UNDIApp v4 or Corbac?

UNDIApp v4 ships an update every 6 weeks, and Corbac monthly. Most recently, UNDIApp v4 was updated on November 3, 2026 and Corbac on November 4, 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.*