# SubStandard vs Stage Builder X

The clearest difference is price: SubStandard at Free against Stage Builder X's $19.99. SubStandard also leads on iOS requirement (12.0 vs 15.1). Stage Builder X's advantage is update cadence (every 11 days vs every 7 months). On ads, in-app purchases and device support there is nothing between them.

SubStandard is free to download; Stage Builder X costs $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

SubStandard ships an update every 7 months, Stage Builder X every 11 days. The most recent releases landed on September 9, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | SubStandard | Stage Builder X |
| --- | --- | --- |
| Price | **Free** | $19.99 |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/substandard/id1513656520/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 11 days** |
| Monetization | Free | — |
| Size | 33 MB | 36 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iService Ottner Röck](https://appshunter.io/developer/1413717324) | [STURE MOSLAATTEN](https://appshunter.io/developer/1881018997) |

## What reviewers say

### SubStandard

[App page](https://appshunter.io/ios/app/substandard/id1513656520)

This aviation utility app simplifies applying cold temperature corrections for altitudes. It allows users to save frequently used altitude sets for rapid retrieval, enhancing efficiency in flight planning.

**Highlights:** Cold temperature corrections, Altitude set storage, Quick access to saved altitudes, Easy to use interface

**Features:** macOS Compatibility

**In-app purchases:** none


### Stage Builder X

[App page](https://appshunter.io/ios/app/stage-builder-x/id6759829164)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SubStandard free?

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

### Is Stage Builder X free?

Stage Builder X costs $19.99, with no in-app purchases.

### Do SubStandard or Stage Builder X have ads?

Neither SubStandard nor Stage Builder X shows ads.

### Which is updated more often, SubStandard or Stage Builder X?

SubStandard ships an update every 7 months, and Stage Builder X every 11 days. Most recently, SubStandard was updated on September 9, 2026 and Stage Builder X on September 8, 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.*