# SkewTLogPro vs C172 Performance

The clearest difference is review sentiment: C172 Performance at 90% against SkewTLogPro's 47%. C172 Performance also leads on rating (4.9 vs 2.7) and in-app purchases (none vs 1). SkewTLogPro's advantage is ads (none vs shown). On price, ratings volume, update cadence 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. C172 Performance asks for nothing beyond the download.

C172 Performance holds the better App Store score, 4.9 against 2.7. Both are backed by a comparable volume of ratings — 97 and 52 respectively. Written reviews point the same way: 47% of SkewTLogPro's written reviews are positive against 90% of C172 Performance's.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 8, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SkewTLogPro | C172 Performance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.7 (97 ratings)](https://appshunter.io/ios/app/skewtlogpro/id522720710/reviews) | **[4.9 (52 ratings)](https://appshunter.io/ios/app/c172-performance/id741721884/reviews)** |
| Number of ratings | **97** | 52 |
| Positive reviews | 46.7% of reviews | **90.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | Subscription | **Ad-supported** |
| Size | 79 MB | 15 MB |
| Requires iOS | 17.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Chad Sandstedt](https://appshunter.io/developer/522720713) | [POH Performance L.L.C.](https://appshunter.io/developer/641403529) |

## 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


### C172 Performance

[App page](https://appshunter.io/ios/app/c172-performance/id741721884)

This app calculates essential flight performance data for Cessna 172 and 150 aircraft. It covers takeoff, landing, climb, cruise, descent, instrument procedures, and emergencies, with additional tools for holds and glide calculations. Cloud sync ensures your flight plans are accessible across devices.

**Highlights:** Takeoff and landing calculations, Climb, cruise, and descent performance, Instrument procedure planning, Emergency scenario calculations, Interactive hold calculator, Emergency glide distance calculator, Cloud sync for flight plans

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SkewTLogPro free?

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

### Is C172 Performance free?

C172 Performance is free to download, with no in-app purchases.

### Which has better reviews, SkewTLogPro or C172 Performance?

C172 Performance is rated higher. SkewTLogPro averages 2.7 out of 5 from 97 ratings, while C172 Performance averages 4.9 from 52 ratings.

### Do SkewTLogPro or C172 Performance have ads?

C172 Performance shows ads; SkewTLogPro does not.

### Which is updated more often, SkewTLogPro or C172 Performance?

SkewTLogPro ships an update every 2 months, and C172 Performance every 2 months. Most recently, SkewTLogPro was updated on October 8, 2026 and C172 Performance on September 18, 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.*