# Sigma Charge vs Ustalar.Az

The clearest difference is iOS requirement: Sigma Charge at 13.4 against Ustalar.Az's 15.6. On price, update cadence, 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 Charge ships an update monthly, Ustalar.Az every 3 weeks. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Sigma Charge | Ustalar.Az |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Size | 54 MB | 35 MB |
| Requires iOS | **13.4** | 15.6 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Sigma Systems, Mmc](https://appshunter.io/developer/1726343396) | [Namik Abdullayev](https://appshunter.io/developer/1855072743) |

## What reviewers say

### Sigma Charge

[App page](https://appshunter.io/ios/app/sigma-charge/id6476268128)

**Features:** macOS Compatibility

**In-app purchases:** none


### Ustalar.Az

[App page](https://appshunter.io/ios/app/ustalaraz/id6759504767)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sigma Charge free?

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

### Is Ustalar.Az free?

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

### Do Sigma Charge or Ustalar.Az have ads?

Neither Sigma Charge nor Ustalar.Az shows ads.

### Which is updated more often, Sigma Charge or Ustalar.Az?

Sigma Charge ships an update monthly, and Ustalar.Az every 3 weeks. Most recently, Sigma Charge was updated on October 14, 2026 and Ustalar.Az on October 7, 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.*