# SubStandard vs Let's Go Pro

The clearest difference is in-app purchases: SubStandard at none against Let's Go Pro's 1. SubStandard also leads on iOS requirement (12.0 vs 15.1). Let's Go Pro's advantage is update cadence (every 6 days vs every 7 months). On price, ads and device support there is nothing between them.

Both are free to download. Let's Go Pro sells 1 in-app purchase, starting at $4.99 per year. SubStandard asks for nothing beyond the download.

SubStandard ships an update every 7 months, Let's Go Pro every 6 days. The most recent releases landed on October 6, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SubStandard | Let's Go Pro |
| --- | --- | --- |
| Price | Free | Free |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 6 days** |
| Monetization | Free | — |
| Size | 33 MB | 52 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iService Ottner Röck](https://appshunter.io/developer/1413717324) | [Bahadir Volkan Ozalp](https://appshunter.io/developer/1896738332) |

## 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, Vision Pro support

**In-app purchases:** none


### Let's Go Pro

[App page](https://appshunter.io/ios/app/lets-go-pro/id6775248056)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Let's Go Pro | $4.99 | per year |


## Frequently asked questions

### Is SubStandard free?

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

### Is Let's Go Pro free?

Let's Go Pro is free to download, with in-app purchases available.

### Do SubStandard or Let's Go Pro have ads?

Neither SubStandard nor Let's Go Pro shows ads.

### Which is updated more often, SubStandard or Let's Go Pro?

SubStandard ships an update every 7 months, and Let's Go Pro every 6 days. Most recently, SubStandard was updated on October 6, 2026 and Let's Go Pro on October 10, 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.*