# TruAirspeed vs GRF Snowtam

The clearest difference is review sentiment: TruAirspeed at 71% against GRF Snowtam's 0%. TruAirspeed also leads on price (Free vs $1.99) and rating (4.1 vs 1.0). GRF Snowtam's advantage is update cadence (every 4 months vs every 24 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

TruAirspeed is free to download; GRF Snowtam costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.

TruAirspeed holds the better App Store score, 4.1 against 1.0. That said, the two scores are not equally well evidenced: TruAirspeed has 8 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 71% of TruAirspeed's written reviews are positive against 0% of GRF Snowtam's.

TruAirspeed ships an update every 24 months, GRF Snowtam every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | TruAirspeed | GRF Snowtam |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[4.1 (8 ratings)](https://appshunter.io/ios/app/truairspeed/id855269892/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/grf-snowtam/id1514590590/reviews) |
| Number of ratings | **8** | 1 |
| Positive reviews | **71.4% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 24 months | **Every 4 months** |
| Monetization | **Free** | Paid |
| Size | 8 MB | 9 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [James Petty](https://appshunter.io/developer/603661046) | [Pedro Isidoro](https://appshunter.io/developer/1506809339) |

## What reviewers say

### TruAirspeed

[App page](https://appshunter.io/ios/app/truairspeed/id855269892)

This utility calculates true airspeed, pressure altitude, density altitude, and Mach number. It accounts for compressibility effects and offers unit choices and keypad styles. Users can also input a correction factor for their airspeed indicator.

**Highlights:** True airspeed calculation, Pressure and density altitude calculation, Mach number calculation, Compressibility effects accounted for, Choice of input/result units, Calculator or telephone keypad options, Airspeed indicator correction factor

**Features:** macOS Compatibility

**In-app purchases:** none


### 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 TruAirspeed free?

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

### Is GRF Snowtam free?

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

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

TruAirspeed is rated higher. TruAirspeed averages 4.1 out of 5 from 8 ratings, while GRF Snowtam averages 1.0 from 1 ratings.

### Do TruAirspeed or GRF Snowtam have ads?

Neither TruAirspeed nor GRF Snowtam shows ads.

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

TruAirspeed ships an update every 24 months, and GRF Snowtam every 4 months. Most recently, TruAirspeed was updated on November 1, 2026 and GRF Snowtam on November 3, 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.*