# coolAltitude vs GRF Snowtam

The clearest difference is review sentiment: coolAltitude at 75% against GRF Snowtam's 0%. coolAltitude also leads on rating (5.0 vs 1.0) and ratings volume (7 vs 1). GRF Snowtam's advantage is in-app purchases (none vs 2) and price ($1.99 vs $7.99). On update cadence, ads and device support there is nothing between them.

coolAltitude costs $7.99 and GRF Snowtam $1.99 up front. coolAltitude sells 2 in-app purchases, starting at $7.99 per year. GRF Snowtam asks for nothing beyond the download.

coolAltitude holds the better App Store score, 5.0 against 1.0. That said, the two scores are not equally well evidenced: coolAltitude has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 75% of coolAltitude's written reviews are positive against 0% of GRF Snowtam's.

coolAltitude ships an update every 5 months, GRF Snowtam every 4 months. Both last shipped on September 7, 2026.

## The numbers

| Metric | coolAltitude | GRF Snowtam |
| --- | --- | --- |
| Price | $7.99 | **$1.99** |
| Rating | **[5.0 (7 ratings)](https://appshunter.io/ios/app/coolaltitude/id641533221/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/grf-snowtam/id1514590590/reviews) |
| Number of ratings | **7** | 1 |
| Positive reviews | **75.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 5 months | **Every 4 months** |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 49 MB | 9 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [SilkIdea s.r.o.](https://appshunter.io/developer/413936304) | [Pedro Isidoro](https://appshunter.io/developer/1506809339) |

## 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 |


### GRF Snowtam

[App page](https://appshunter.io/ios/app/grf-snowtam/id1514590590)

Decode aviation weather reports with this tool. It handles Global Reporting Format (GRF) and older Snowtam formats, converts visibility and temperature units, and calculates altitude corrections for cold weather.

**Highlights:** GRF decoder, Snowtam decoder, MOTNE decoder, Visibility converter, Temperature converter, Altitude correction calculator

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is coolAltitude free?

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

### Is GRF Snowtam free?

GRF Snowtam costs $1.99, with no in-app purchases.

### Which has better reviews, coolAltitude or GRF Snowtam?

coolAltitude is rated higher. coolAltitude averages 5.0 out of 5 from 7 ratings, while GRF Snowtam averages 1.0 from 1 ratings.

### Do coolAltitude or GRF Snowtam have ads?

Neither coolAltitude nor GRF Snowtam shows ads.

### Which is updated more often, coolAltitude or GRF Snowtam?

coolAltitude ships an update every 5 months, and GRF Snowtam every 4 months. Most recently, coolAltitude was updated on September 7, 2026 and GRF Snowtam on September 7, 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.*