Comparison

coolAltitude vs GRF Snowtam

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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/

About

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.

Highlights
  • GRF decoder
  • Snowtam decoder
  • MOTNE decoder
  • Visibility converter
  • Temperature converter
  • Altitude correction calculator
Features
Read full description

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

coolAltitude4 screens
GRF Snowtam4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
coolAltitude versus GRF Snowtam: the parameters behind the verdict, then further details
ParametercoolAltitudeGRF Snowtam
Price$7.99$1.99 — better
Rating5.0 (7 ratings) — better1.0 (1 ratings)
Positive reviews60.0% of reviews — better0.0% of reviews
Number of ratings7 — better1
Update frequencyEvery 3 months — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPadiPhone, iPod
Requires iOS17.015.6 — better
Further details — not scored
Size56 MB9 MB
Age rating17+4+
DeveloperSilkIdea s.r.o.Pedro Isidoro

Customer experience

coolAltitude

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews5 reviews
Positive60.0%
Neutral0.0%
Negative40.0%

GRF Snowtam

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

2 purchases

coolAltitude

Subscriptions2
  • De & Anti-Icing Pro$7.991 Year
  • Save & Retrieve Approach Data$7.991 Year
None

GRF Snowtam

No in-app purchases

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 3 months, and GRF Snowtam every 4 months. Most recently, coolAltitude was updated on November 6, 2026 and GRF Snowtam on November 3, 2026.

Other comparisons