# Spin vs SkewTLogPro

The clearest difference is price: SkewTLogPro at Free against Spin's $2.99. Spin's advantage is rating (4.6 vs 2.7) and review sentiment (86% vs 47%). On ratings volume, update cadence, ads and device support there is nothing between them.

SkewTLogPro is free to download; Spin costs $2.99 up front. SkewTLogPro sells 1 in-app purchase, starting at $12.99 per year. Spin asks for nothing beyond the download.

Spin holds the better App Store score, 4.6 against 2.7. Both are backed by a comparable volume of ratings — 44 and 97 respectively. Written reviews point the same way: 86% of Spin's written reviews are positive against 47% of SkewTLogPro's.

Spin ships an update every 3 months, SkewTLogPro every 2 months. The most recent releases landed on September 25, 2026 and September 23, 2026 respectively.

## The numbers

| Metric | Spin | SkewTLogPro |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| Rating | **[4.6 (44 ratings)](https://appshunter.io/ios/app/spin-a-wind/id327740080/reviews)** | [2.7 (97 ratings)](https://appshunter.io/ios/app/skewtlogpro/id522720710/reviews) |
| Number of ratings | 44 | **97** |
| Positive reviews | **86.1% of reviews** | 46.7% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | **Paid** | Subscription |
| Size | 10 MB | 79 MB |
| Requires iOS | **6.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Len Robinson](https://appshunter.io/developer/327740083) | [Chad Sandstedt](https://appshunter.io/developer/522720713) |

## What reviewers say

### Spin

[App page](https://appshunter.io/ios/app/spin-a-wind/id327740080)

Calculate critical aviation weather data including wind components, temperature conversions, altitude calculations, and airspeed. Designed for pilots with an intuitive, one-handed interface and instant results.

**Highlights:** Wind component calculation (headwind, tailwind, crosswind), Temperature conversions and wind chill factor, Altitude calculations (pressure, density), Airspeed calculator (TAS, Mach, speed of sound), Customizable units and caution thresholds, One-handed, reel-based interface

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

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Spin free?

Spin costs $2.99, with no in-app purchases.

### Is SkewTLogPro free?

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

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

Spin is rated higher. Spin averages 4.6 out of 5 from 44 ratings, while SkewTLogPro averages 2.7 from 97 ratings.

### Do Spin or SkewTLogPro have ads?

Neither Spin nor SkewTLogPro shows ads.

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

Spin ships an update every 3 months, and SkewTLogPro every 2 months. Most recently, Spin was updated on September 25, 2026 and SkewTLogPro on September 23, 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.*