# İDDEF vs ÇOSB

The clearest difference is update cadence: ÇOSB at weekly against İDDEF's every 6 weeks. ÇOSB also leads on iOS requirement (12.0 vs 16.4). On price, ads, in-app purchases and device support there is nothing between them.

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

İDDEF ships an update every 6 weeks, ÇOSB weekly. The most recent releases landed on November 2, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | İDDEF | ÇOSB |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/iddef/id1374880713/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 32 MB | 45 MB |
| Requires iOS | 16.4 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [İDDEF](https://appshunter.io/developer/1374880712) | [Metin KOCABAS](https://appshunter.io/developer/1505475218) |

## What reviewers say

### İDDEF

[App page](https://appshunter.io/ios/app/iddef/id1374880713)

This organization, founded by scholars of the İsmailağa Community, aims to spread religious outreach and madrasah education globally. It also engages in humanitarian aid activities across various sectors.

**Highlights:** Religious outreach activities, Madrasah system promotion, Humanitarian aid, Global reach, Istanbul-based

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

**In-app purchases:** none


### ÇOSB

[App page](https://appshunter.io/ios/app/cosb/id1505475219)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is İDDEF free?

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

### Is ÇOSB free?

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

### Do İDDEF or ÇOSB have ads?

Neither İDDEF nor ÇOSB shows ads.

### Which is updated more often, İDDEF or ÇOSB?

İDDEF ships an update every 6 weeks, and ÇOSB weekly. Most recently, İDDEF was updated on November 2, 2026 and ÇOSB on October 25, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*