# DUOSS vs CONCARH 2025

The clearest difference is ads: DUOSS at none against CONCARH 2025's shown. CONCARH 2025's advantage is update cadence (every 3 months vs every 28 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

DUOSS ships an update every 28 months, CONCARH 2025 every 3 months. The most recent releases landed on October 5, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | DUOSS | CONCARH 2025 |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 28 months | **Every 3 months** |
| Size | 36 MB | 41 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Cativa Tecnologia e Servicos Digitais](https://appshunter.io/developer/1498249979) | [ABRH-SC](https://appshunter.io/developer/1387480087) |

## What reviewers say

### DUOSS

[App page](https://appshunter.io/ios/app/duoss/id6476010112)

**Features:** macOS Compatibility

**In-app purchases:** none


### CONCARH 2025

[App page](https://appshunter.io/ios/app/concarh-2025/id6742334102)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DUOSS free?

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

### Is CONCARH 2025 free?

CONCARH 2025 is free to download, with no in-app purchases.

### Do DUOSS or CONCARH 2025 have ads?

CONCARH 2025 shows ads; DUOSS does not.

### Which is updated more often, DUOSS or CONCARH 2025?

DUOSS ships an update every 28 months, and CONCARH 2025 every 3 months. Most recently, DUOSS was updated on October 5, 2026 and CONCARH 2025 on September 29, 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.*