# Approach Speed Calculator Pro vs 737 CSFF

The clearest difference is rating: 737 CSFF at 5.0 against Approach Speed Calculator Pro's 4.5. Approach Speed Calculator Pro's advantage is ratings volume (33 vs 2) and iOS requirement (14.0 vs 17.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Approach Speed Calculator Pro costs $2.99 and 737 CSFF $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

737 CSFF holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: Approach Speed Calculator Pro has 33 ratings behind it against 2, so its average is the more settled of the two.

Approach Speed Calculator Pro ships an update every 3 months, 737 CSFF every 4 months. The most recent releases landed on November 6, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Approach Speed Calculator Pro | 737 CSFF |
| --- | --- | --- |
| Price | $2.99 | $2.99 |
| Rating | [4.5 (33 ratings)](https://appshunter.io/ios/app/approach-speed-calculator-pro/id581569231/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/737-csff/id1551516212/reviews)** |
| Number of ratings | **33** | 2 |
| Positive reviews | 80.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Paid | Paid |
| Size | 20 MB | 11 MB |
| Requires iOS | **14.0** | 17.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Santiago Borja Lopez](https://appshunter.io/developer/581569234) | [Dan O'Leary](https://appshunter.io/developer/1177083778) |

## What reviewers say

### Approach Speed Calculator Pro

[App page](https://appshunter.io/ios/app/approach-speed-calculator-pro/id581569231)

This tool helps pilots quickly and accurately calculate approach speeds for safe landings, following Boeing's FCTM procedures. It supports all Boeing models and is also recommended for Airbus and other jet aircraft.

**Highlights:** Calculate approach speeds, Follows Boeing FCTM procedures, Supports all Boeing models, Recommended for Airbus and other jets, Accurate landing speed determination

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

**In-app purchases:** none


### 737 CSFF

[App page](https://appshunter.io/ios/app/737-csff/id1551516212)

A visual guide to understanding Cold Soaked Fuel Frost (CSFF) on 737 aircraft wings. It references airline handbooks and Boeing FCOM guidance for educational purposes.

**Highlights:** Visual representation of CSFF scenarios, Study guide for 737 wing frost, References North American Airline Flight Handbook, Includes Boeing FCOM guidance, Educational tool for pilots

**In-app purchases:** none


## Frequently asked questions

### Is Approach Speed Calculator Pro free?

Approach Speed Calculator Pro costs $2.99, with no in-app purchases.

### Is 737 CSFF free?

737 CSFF costs $2.99, with no in-app purchases.

### Which has better reviews, Approach Speed Calculator Pro or 737 CSFF?

737 CSFF is rated higher. Approach Speed Calculator Pro averages 4.5 out of 5 from 33 ratings, while 737 CSFF averages 5.0 from 2 ratings.

### Do Approach Speed Calculator Pro or 737 CSFF have ads?

Neither Approach Speed Calculator Pro nor 737 CSFF shows ads.

### Which is updated more often, Approach Speed Calculator Pro or 737 CSFF?

Approach Speed Calculator Pro ships an update every 3 months, and 737 CSFF every 4 months. Most recently, Approach Speed Calculator Pro was updated on November 6, 2026 and 737 CSFF on November 3, 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.*