# coolAltitude vs SubStandard

coolAltitude and SubStandard both sit at 5.0 stars, but that hides the real split: 75% of coolAltitude's written reviews are positive against 0% of SubStandard's. coolAltitude also leads on ratings volume (7 vs 2). SubStandard's advantage is price (Free vs $7.99) and in-app purchases (none vs 2). On rating, update cadence, ads and device support there is nothing between them.

SubStandard is free to download; coolAltitude costs $7.99 up front. coolAltitude sells 2 in-app purchases, starting at $7.99 per year. SubStandard asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for coolAltitude against 5.0 for SubStandard. Both are backed by a comparable volume of ratings — 7 and 2 respectively. Written reviews are what separate them: 75% of coolAltitude's written reviews are positive against 0% of SubStandard's.

coolAltitude ships an update every 5 months, SubStandard every 7 months. The most recent releases landed on September 7, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | coolAltitude | SubStandard |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | [5.0 (7 ratings)](https://appshunter.io/ios/app/coolaltitude/id641533221/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/substandard/id1513656520/reviews) |
| Number of ratings | **7** | 2 |
| Positive reviews | **75.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 7 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 49 MB | 33 MB |
| Requires iOS | 17.0 | **12.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 17+ | 4+ |
| Developer | [SilkIdea s.r.o.](https://appshunter.io/developer/413936304) | [iService Ottner Röck](https://appshunter.io/developer/1413717324) |

## What reviewers say

### coolAltitude

[App page](https://appshunter.io/ios/app/coolaltitude/id641533221)

This professional tool assists IFR pilots in cold weather with temperature corrections for instrument approaches. It integrates weather, runway, and de-/anti-icing data into a clear workflow to reduce workload and enhance situational awareness during flight preparation.

**Highlights:** Temperature-corrected altitude calculations for various approaches, Integrated weather and runway condition data, De-/anti-icing support with holdover time timers, SNOWTAM decoding and braking action information, Save and share approach presets and operational data

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| De & Anti-Icing Pro | $7.99 | per year |
| Save & Retrieve Approach Data | $7.99 | per year |


### 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


## Frequently asked questions

### Is coolAltitude free?

coolAltitude costs $7.99, and also offers in-app purchases.

### Is SubStandard free?

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

### Which has better reviews, coolAltitude or SubStandard?

coolAltitude and SubStandard are both rated 5.0 out of 5 on the App Store, from 7 and 2 ratings respectively.

### Do coolAltitude or SubStandard have ads?

Neither coolAltitude nor SubStandard shows ads.

### Which is updated more often, coolAltitude or SubStandard?

coolAltitude ships an update every 5 months, and SubStandard every 7 months. Most recently, coolAltitude was updated on September 7, 2026 and SubStandard on September 9, 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.*