# SkewTLogPro vs Fire Size Estimator

The clearest difference is rating: Fire Size Estimator at 5.0 against SkewTLogPro's 2.6. Fire Size Estimator also leads on in-app purchases (none vs 1) and update cadence (every 6 days vs every 2 months). SkewTLogPro's advantage is ratings volume (99 vs 2) and iOS requirement (17.0 vs 26.5). 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. Fire Size Estimator asks for nothing beyond the download.

Fire Size Estimator holds the better App Store score, 5.0 against 2.6. That said, the two scores are not equally well evidenced: SkewTLogPro has 99 ratings behind it against 2, so its average is the more settled of the two.

SkewTLogPro ships an update every 2 months, Fire Size Estimator every 6 days. The most recent releases landed on October 24, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | SkewTLogPro | Fire Size Estimator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.6 (99 ratings)](https://appshunter.io/ios/app/skewtlogpro/id522720710/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fire-size-estimator/id6776805673/reviews)** |
| Number of ratings | **99** | 2 |
| Positive reviews | 46.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 days** |
| Monetization | Subscription | **Free** |
| Size | 79 MB | 2 MB |
| Requires iOS | **17.0** | 26.5 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Chad Sandstedt](https://appshunter.io/developer/522720713) | [Don Bell](https://appshunter.io/developer/6776805675) |

## 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


### Fire Size Estimator

[App page](https://appshunter.io/ios/app/fire-size-estimator/id6776805673)

This tool helps calculate the size of wildland fires in acres or hectares. It's designed for professionals in the field who need quick and reliable measurements. The app is straightforward, requiring no accounts or data collection.

**Highlights:** Calculate fire size in acres, Calculate fire size in hectares, Field-ready tool, No account required, No data collection

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

**In-app purchases:** none


## Frequently asked questions

### Is SkewTLogPro free?

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

### Is Fire Size Estimator free?

Fire Size Estimator is free to download, with no in-app purchases.

### Which has better reviews, SkewTLogPro or Fire Size Estimator?

Fire Size Estimator is rated higher. SkewTLogPro averages 2.6 out of 5 from 99 ratings, while Fire Size Estimator averages 5.0 from 2 ratings.

### Do SkewTLogPro or Fire Size Estimator have ads?

Neither SkewTLogPro nor Fire Size Estimator shows ads.

### Which is updated more often, SkewTLogPro or Fire Size Estimator?

SkewTLogPro ships an update every 2 months, and Fire Size Estimator every 6 days. Most recently, SkewTLogPro was updated on October 24, 2026 and Fire Size Estimator on October 15, 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.*