# SkewTLogPro vs TruAirspeed

The clearest difference is rating: TruAirspeed at 4.1 against SkewTLogPro's 2.7. TruAirspeed also leads on in-app purchases (none vs 1) and review sentiment (71% vs 47%). SkewTLogPro's advantage is update cadence (every 2 months vs every 24 months) and ratings volume (97 vs 8). On price, ads and device support there is nothing between them.

Both are free to download. SkewTLogPro sells 1 in-app purchase, starting at $12.99 per year. TruAirspeed asks for nothing beyond the download.

TruAirspeed holds the better App Store score, 4.1 against 2.7. That said, the two scores are not equally well evidenced: SkewTLogPro has 97 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 47% of SkewTLogPro's written reviews are positive against 71% of TruAirspeed's.

SkewTLogPro ships an update every 2 months, TruAirspeed every 24 months. The most recent releases landed on September 23, 2026 and June 2, 2026 respectively.

## The numbers

| Metric | SkewTLogPro | TruAirspeed |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (97 ratings)](https://appshunter.io/ios/app/skewtlogpro/id522720710/reviews) | **[4.1 (8 ratings)](https://appshunter.io/ios/app/truairspeed/id855269892/reviews)** |
| Number of ratings | **97** | 8 |
| Positive reviews | 46.7% of reviews | **71.4% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 24 months |
| Monetization | Subscription | **Free** |
| Size | 79 MB | 8 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chad Sandstedt](https://appshunter.io/developer/522720713) | [James Petty](https://appshunter.io/developer/603661046) |

## What reviewers say

### SkewTLogPro

[App page](https://appshunter.io/ios/app/skewtlogpro/id522720710)

Access powerful skew-t log-p charts with one touch. View atmospheric data like temperature, dew point, and winds aloft at various altitudes. Supports current GPS location, airport codes, or lat/lon for detailed weather analysis.

**Highlights:** One-touch skew-t log-p chart access, View charts by GPS, airport ID, or lat/lon, Visual indication of temperature, dew point, winds aloft, Support for International Airport ICAO codes, View charts along your route, Save charts for offline use, Scroll forward/backward for past and forecast charts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Annual Subscription | $12.99 | per year |

**What reviewers like**

- 📊 Excellent tool for flight planning and weather analysis
- ☁️ Accurate cloud top and bottom predictions
- ❄️ Helpful for identifying icing conditions and freezing levels
- 🎯 Comprehensive atmospheric information in one app
- 👨‍✈️ Essential resource for pilots and weather enthusiasts

**What reviewers complain about**

- 💰 Sudden switch to subscription model for existing paid users
- 🚫 No grandfathering or refunds for previous purchasers
- ⏸️ Extended downtime when data source became unavailable
- 📵 App becomes completely non-functional without subscription
- 💸 High annual subscription fee ($13/year) relative to competitors

**Reported bugs**

- App crashes when selecting locations
- Data timeout errors after updates
- App becomes non-functional when data source API changes
- Slow performance and lag when flipping through hourly forecasts on iPad
- Crashes when manually changing parameters on iPad

**Requested features**

- Interactive charts like rucsoundings with exact value selection
- Extended forecast range beyond 18 hours using GFS data
- Remember last input locations for route planning
- Display CAPE, LFC, EL, and adiabatic lines graphically on chart
- Show weather model being used in the app


### 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


## Frequently asked questions

### Is SkewTLogPro free?

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

### Is TruAirspeed free?

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

### Which has better reviews, SkewTLogPro or TruAirspeed?

TruAirspeed is rated higher. SkewTLogPro averages 2.7 out of 5 from 97 ratings, while TruAirspeed averages 4.1 from 8 ratings.

### Do SkewTLogPro or TruAirspeed have ads?

Neither SkewTLogPro nor TruAirspeed shows ads.

### Which is updated more often, SkewTLogPro or TruAirspeed?

SkewTLogPro ships an update every 2 months, and TruAirspeed every 24 months. Most recently, SkewTLogPro was updated on September 23, 2026 and TruAirspeed on June 2, 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.*