# coolAltitude vs Q400

The clearest difference is price: Q400 at Free against coolAltitude's $7.99. On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Q400 is free to download; coolAltitude costs $7.99 up front. coolAltitude sells 2 in-app purchases, starting at $7.99 per year and Q400 sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | coolAltitude | Q400 |
| --- | --- | --- |
| Price | $7.99 | **Free** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/coolaltitude/id641533221/reviews)** | — |
| Number of ratings | **7** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | — |
| Monetization | Free with in-app purchases | — |
| Size | 49 MB | 10 MB |
| Requires iOS | **17.0** | 18.6 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [SilkIdea s.r.o.](https://appshunter.io/developer/413936304) | [MacLaren's Studio](https://appshunter.io/developer/549588446) |

## 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 |


### Q400

[App page](https://appshunter.io/ios/app/q400-performance/id6758963990)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $4.99 | per month |
| Annual | $29.99 | per year |


## Frequently asked questions

### Is coolAltitude free?

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

### Is Q400 free?

Q400 is free to download, with in-app purchases available.

### Do coolAltitude or Q400 have ads?

Neither coolAltitude nor Q400 shows ads.

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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.*