# Air~Select vs S4C

The clearest difference is update cadence: S4C at monthly against Air~Select's every 6 months. 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.

Air~Select ships an update every 6 months, S4C monthly. The most recent releases landed on October 12, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Air~Select | S4C |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/airselect/id1348601736/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Monthly** |
| Monetization | Free | — |
| Size | 31 MB | 35 MB |
| Requires iOS | 13.0 | **12** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Subodh Nair](https://appshunter.io/developer/1232337002) | [SUTO iTEC (China) Co. Ltd](https://appshunter.io/developer/1511502112) |

## What reviewers say

### Air~Select

[App page](https://appshunter.io/ios/app/airselect/id1348601736)

This utility helps users select the appropriate air compressor based on critical technical specifications. It considers factors such as operating pressure and required airflow to guide your choice.

**Highlights:** Compressor selection tool, Technical specification input, Operating pressure consideration, Airflow requirement calculation, Guided selection process

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

**In-app purchases:** none


### S4C

[App page](https://appshunter.io/ios/app/s4c-fs/id1619076144)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Air~Select free?

Air~Select is free to download, with no in-app purchases.

### Is S4C free?

S4C is free to download, with no in-app purchases.

### Do Air~Select or S4C have ads?

Neither Air~Select nor S4C shows ads.

### Which is updated more often, Air~Select or S4C?

Air~Select ships an update every 6 months, and S4C monthly. Most recently, Air~Select was updated on October 12, 2026 and S4C on October 6, 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.*