# SIGMA CIDIU vs Why Cloud

The clearest difference is update cadence: Why Cloud at every 3 weeks against SIGMA CIDIU's every 2 months. SIGMA CIDIU's advantage is device support (3 vs 1) and iOS requirement (11.0 vs 17.6). On price, ads and in-app purchases there is nothing between them.

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

SIGMA CIDIU ships an update every 2 months, Why Cloud every 3 weeks. The most recent releases landed on October 2, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SIGMA CIDIU | Why Cloud |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Size | 21 MB | 8 MB |
| Requires iOS | **11.0** | 17.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ID&A S.r.l.](https://appshunter.io/developer/1446283055) | [1Control](https://appshunter.io/developer/1044212789) |

## What reviewers say

### SIGMA CIDIU

[App page](https://appshunter.io/ios/app/sigma-cidiu/id1544746166)

**Features:** macOS Compatibility

**In-app purchases:** none


### Why Cloud

[App page](https://appshunter.io/ios/app/why-cloud/id6755540381)

**In-app purchases:** none


## Frequently asked questions

### Is SIGMA CIDIU free?

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

### Is Why Cloud free?

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

### Do SIGMA CIDIU or Why Cloud have ads?

Neither SIGMA CIDIU nor Why Cloud shows ads.

### Which is updated more often, SIGMA CIDIU or Why Cloud?

SIGMA CIDIU ships an update every 2 months, and Why Cloud every 3 weeks. Most recently, SIGMA CIDIU was updated on October 2, 2026 and Why Cloud on September 18, 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.*