# OIDDS vs CEMS@FEO

The clearest difference is update cadence: OIDDS at every 3 months against CEMS@FEO's every 18 months. OIDDS also leads on iOS requirement (12.0 vs 15.0). 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.

OIDDS ships an update every 3 months, CEMS@FEO every 18 months. The most recent releases landed on October 7, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | OIDDS | CEMS@FEO |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 18 months |
| Size | 45 MB | 40 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CAMP CHALLENGE PTE. LTD.](https://appshunter.io/developer/1512378273) | [Far East Organization](https://appshunter.io/developer/762154117) |

## What reviewers say

### OIDDS

[App page](https://appshunter.io/ios/app/oidds/id1512378274)

**Features:** macOS Compatibility

**In-app purchases:** none


### CEMS@FEO

[App page](https://appshunter.io/ios/app/cemsfeo/id1519288507)

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

**In-app purchases:** none


## Frequently asked questions

### Is OIDDS free?

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

### Is CEMS@FEO free?

CEMS@FEO is free to download, with no in-app purchases.

### Do OIDDS or CEMS@FEO have ads?

Neither OIDDS nor CEMS@FEO shows ads.

### Which is updated more often, OIDDS or CEMS@FEO?

OIDDS ships an update every 3 months, and CEMS@FEO every 18 months. Most recently, OIDDS was updated on October 7, 2026 and CEMS@FEO on October 2, 2026.

---

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