# NRMCA vs SkyOS

The clearest difference is update cadence: SkyOS at fortnightly against NRMCA's every 6 months. SkyOS also leads on iOS requirement (15.1 vs 17.0). 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.

NRMCA ships an update every 6 months, SkyOS fortnightly. The most recent releases landed on October 4, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | NRMCA | SkyOS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Fortnightly** |
| Size | 77 MB | 35 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [National Ready-Mixed Concrete Association](https://appshunter.io/developer/1435678896) | [ODP Solutions, Inc](https://appshunter.io/developer/1439602319) |

## What reviewers say

### NRMCA

[App page](https://appshunter.io/ios/app/nrmca/id1435678897)

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

**In-app purchases:** none


### SkyOS

[App page](https://appshunter.io/ios/app/skyos/id6760689659)

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

**In-app purchases:** none


## Frequently asked questions

### Is NRMCA free?

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

### Is SkyOS free?

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

### Do NRMCA or SkyOS have ads?

Neither NRMCA nor SkyOS shows ads.

### Which is updated more often, NRMCA or SkyOS?

NRMCA ships an update every 6 months, and SkyOS fortnightly. Most recently, NRMCA was updated on October 4, 2026 and SkyOS 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.*