coolAltitude vs GRF Snowtam
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
coolAltitude
This app provides pilots with essential tools for cold-temperature altitude corrections, approach profiles, and de-icing calculations. It integrates weather data and offers a clear interface for critical flight planning information.
- Cold-temperature altitude corrections
- Approach profile visualization
- De-icing and holdover time calculations
- FMS-style approach setup
- METAR, TAF, and runway condition integration
- Light and dark mode support
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coolAltitude brings cold-temperature altitude corrections, approach profiles and de-icing tools into one focused workspace for pilots. ALTITUDE CORRECTIONS Enter the temperature and approach data, compare entered and corrected altitudes, and see the result in a clear approach profile. Select the correction method and rounding option for your workflow. DME shift helps put distance references in context. APPROACH SETUP Use the FMS-style interface to work with airport, runway and approach data. A structured display and dedicated keys keep the setup readable alongside the profile. DE-ICING AND HOLDOVER TIME Select the applicable conditions, fluid type and concentration. Review the available holdover guidance and keep the countdown visible during your workflow. WEATHER AND RUNWAY CONTEXT Consult METAR, TAF and runway-condition information alongside your calculations. Online information depends on the availability of the connected services. READABLE IN LIGHT AND DARK Clear colour roles distinguish inputs, corrected values and shifted values. Light and Dark appearances support different lighting conditions, with restrained surfaces and readable controls. Some features require an in-app subscription. Check the in-app purchase screen for the features included, subscription terms and current pricing. Use current operational information and the procedures applicable to your aircraft and operation when assessing results. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
GRF Snowtam
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.
- GRF decoder
- Snowtam decoder
- MOTNE decoder
- Visibility converter
- Temperature converter
- Altitude correction calculator
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Complete and Accurate GRF decoder (New format GRF - global reporting format) to decode RCAM. Complete and Accurate Snowtam decoder (old format - used in Russia). MOTNE Decoder (Old format for Runway Condition Code) Converter for U.S. Visibility SM/m table, and temperatures Altitude correction calculator for cold Temperatures enjoy!
Screenshots
Verdict
The clearest difference is review sentiment: coolAltitude at 60% 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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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: 60% of coolAltitude's written reviews are positive against 0% of GRF Snowtam's.
coolAltitude ships an update every 3 months, GRF Snowtam every 4 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.
| Parameter | coolAltitude | GRF Snowtam |
|---|---|---|
| Price | $7.99 | $1.99 — better |
| Rating | 5.0 (7 ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 60.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 7 — better | 1 |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases — better | Paid |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 17.0 | 15.6 — better |
| Further details — not scored | ||
| Size | 56 MB | 9 MB |
| Age rating | 17+ | 4+ |
| Developer | SilkIdea s.r.o. | Pedro Isidoro |
Customer experience
coolAltitude
GRF Snowtam
In-app purchases
coolAltitude
- De & Anti-Icing Pro$7.991 Year
- Save & Retrieve Approach Data$7.991 Year
GRF Snowtam
No in-app purchases
Questions
Is coolAltitude free?
Is GRF Snowtam free?
Which has better reviews, coolAltitude or GRF Snowtam?
Do coolAltitude or GRF Snowtam have ads?
Which is updated more often, coolAltitude or GRF Snowtam?
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