# Sigma 100 vs ISUD Zero

The clearest difference is price: Sigma 100 at Free against ISUD Zero's $0.99. ISUD Zero's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Sigma 100 is free to download; ISUD Zero costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Sigma 100 | ISUD Zero |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 39 months | — |
| Size | 4 MB | 119 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [CHIEN-HUNG CHEN](https://appshunter.io/developer/460805169) | [Suwitcha Sugthana](https://appshunter.io/developer/372726303) |

## What reviewers say

### Sigma 100

[App page](https://appshunter.io/ios/app/sigma-100/id1562647378)

**Features:** macOS Compatibility

**In-app purchases:** none


### ISUD Zero

[App page](https://appshunter.io/ios/app/isud-zero/id6765926399)

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

**In-app purchases:** none


## Frequently asked questions

### Is Sigma 100 free?

Sigma 100 is free to download, with no in-app purchases.

### Is ISUD Zero free?

ISUD Zero costs $0.99, with no in-app purchases.

### Do Sigma 100 or ISUD Zero have ads?

Sigma 100 shows ads; ISUD Zero does not.

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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.*