# SkewTLogPro vs Wind Calculator

The clearest difference is price: SkewTLogPro at Free against Wind Calculator's $1.99. Wind Calculator's advantage is in-app purchases (none vs 1) and update cadence (every 2 days vs every 2 months). On ads, device support and iOS requirement there is nothing between them.

SkewTLogPro is free to download; Wind Calculator costs $1.99 up front. SkewTLogPro sells 1 in-app purchase, starting at $12.99 per year. Wind Calculator asks for nothing beyond the download.

SkewTLogPro ships an update every 2 months, Wind Calculator every 2 days. The most recent releases landed on October 21, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SkewTLogPro | Wind Calculator |
| --- | --- | --- |
| Price | **Free** | $1.99 |
| Rating | **[2.6 (99 ratings)](https://appshunter.io/ios/app/skewtlogpro/id522720710/reviews)** | — |
| Number of ratings | **99** | — |
| Positive reviews | 46.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 days** |
| Monetization | Subscription | — |
| Size | 79 MB | 51 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chad Sandstedt](https://appshunter.io/developer/522720713) | [ALEKSI GOULET](https://appshunter.io/developer/1840510431) |

## 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


### Wind Calculator

[App page](https://appshunter.io/ios/app/wind-calculator-check-limits/id6778305666)

**In-app purchases:** none


## Frequently asked questions

### Is SkewTLogPro free?

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

### Is Wind Calculator free?

Wind Calculator costs $1.99, with no in-app purchases.

### Do SkewTLogPro or Wind Calculator have ads?

Neither SkewTLogPro nor Wind Calculator shows ads.

### Which is updated more often, SkewTLogPro or Wind Calculator?

SkewTLogPro ships an update every 2 months, and Wind Calculator every 2 days. Most recently, SkewTLogPro was updated on October 21, 2026 and Wind Calculator on October 10, 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.*