# SkewTLogPro vs TwoTenDegrees

The clearest difference is review sentiment: SkewTLogPro at 47% against TwoTenDegrees's 0%. SkewTLogPro also leads on ratings volume (97 vs 1). TwoTenDegrees's advantage is rating (5.0 vs 2.7) and in-app purchases (none vs 1). On price, ads, device support and iOS requirement there is nothing between them.

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

TwoTenDegrees holds the better App Store score, 5.0 against 2.7. That said, the two scores are not equally well evidenced: SkewTLogPro has 97 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 47% of SkewTLogPro's written reviews are positive against 0% of TwoTenDegrees's, so the app with the better star average is not the one people write more warmly about.

SkewTLogPro ships an update every 2 months, TwoTenDegrees every 9 days. The most recent releases landed on September 23, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | SkewTLogPro | TwoTenDegrees |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (97 ratings)](https://appshunter.io/ios/app/skewtlogpro/id522720710/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/twotendegrees/id6504466524/reviews)** |
| Number of ratings | **97** | 1 |
| Positive reviews | **46.7% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 9 days** |
| Monetization | Subscription | **Free** |
| Size | 79 MB | 1 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | iPhone, iPad | **iPhone, iPad, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Chad Sandstedt](https://appshunter.io/developer/522720713) | [Scott Sloan](https://appshunter.io/developer/1752409905) |

## 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


### TwoTenDegrees

[App page](https://appshunter.io/ios/app/twotendegrees/id6504466524)

This utility calculates the impossible turn, a critical maneuver for pilots in case of engine failure. It provides precise calculations to help pilots determine the safest return to the runway.

**Highlights:** Impossible turn calculation, Engine failure scenario, Runway return planning, Pilot utility tool

**In-app purchases:** none


## Frequently asked questions

### Is SkewTLogPro free?

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

### Is TwoTenDegrees free?

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

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

TwoTenDegrees is rated higher. SkewTLogPro averages 2.7 out of 5 from 97 ratings, while TwoTenDegrees averages 5.0 from 1 ratings.

### Do SkewTLogPro or TwoTenDegrees have ads?

Neither SkewTLogPro nor TwoTenDegrees shows ads.

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

SkewTLogPro ships an update every 2 months, and TwoTenDegrees every 9 days. Most recently, SkewTLogPro was updated on September 23, 2026 and TwoTenDegrees on September 9, 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.*