Comparison

737 CSFF vs Standard Deviation

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

737 CSFF

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
Currently charting
Read full description

This app is a study guide and a visual representation to aid in the understanding around the many scenarios when Cold Soaked Fuel Frost (CSFF) is encountered on the wing of a 737. This app is not approved for use during flight operations. The CSFF guidance in this app is designed around a North American Airline Flight Handbook and reference to the Boeing FCOM. This app is not a substitute for company flight manuals, an FAA approved deicing program, Boeing FCOM guidance or good judgement.

About

Standard Deviation

Read full description

SD calculator is an iOS application developed for the calculation of standard deviation problems. It includes entering data values and selecting the type of standard deviation i.e. sample or population. Features of standard deviation calculator Design The design of this application is unique and its style and theme are attractive. This app is designed to top all the other apps out there in the design department. Input field The input field is easy to use to enter data and get the result. Simply, add the comma-separated values and choose the type of standard deviation. Multiple options There are multiple options available in this application as you can get the mean, sample standard deviation, population standard deviation, deviation (difference of data values from the mean), square of deviation, sample variance, and population variance. Results The step-by-step solution will be provided just after hitting the calculate button for the sample and population data. This will help you to ease up the lengthy and time-consuming calculation in a fraction of a second. How to use a standard deviation calculator? This application is easy to use, but just in case you need a guide, here it is. • First of all, enter the comma-separated values into the input box. • Select the type of the standard deviation i.e. sample or population. • Press the calculate button. • The step-by-step result will show just after pressing the calculate button • Hit the reset button to enter new data.

Screenshots

737 CSFF3 screens
Standard Deviation4 screens

Verdict

The call

The clearest difference is price: Standard Deviation at Free against 737 CSFF's $2.99. Standard Deviation also leads on iOS requirement (13.0 vs 17.6). 737 CSFF's advantage is chart position (#197 vs unranked). On update cadence, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Standard Deviation is free to download; 737 CSFF costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

737 CSFF ships an update every 4 months, Standard Deviation every 2 months. The most recent releases landed on August 3, 2026 and September 12, 2026 respectively.

Scorecard3 real differences · 7 level
737 CSFF versus Standard Deviation: the parameters behind the verdict, then further details
Parameter737 CSFFStandard Deviation
Price$2.99Free — better
Rating5.0 (2 ratings) — better—
Number of ratings2 — better—
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
Best chart rank#197 — better—
DevicesiPhone, iPad, Apple WatchiPhone, iPad, iPod, Mac — better
Requires iOS17.613.0 — better
Further details — not scored
Size11 MB21 MB
Age rating4+4+
DeveloperDan O'LearyAhmad Sattar

In-app purchases

None

737 CSFF

No in-app purchases

None

Standard Deviation

No in-app purchases

Questions

Is 737 CSFF free?
737 CSFF costs $2.99, with no in-app purchases.
Is Standard Deviation free?
Standard Deviation is free to download, with no in-app purchases.
Do 737 CSFF or Standard Deviation have ads?
Neither 737 CSFF nor Standard Deviation shows ads.
Which is updated more often, 737 CSFF or Standard Deviation?
737 CSFF ships an update every 4 months, and Standard Deviation every 2 months. Most recently, 737 CSFF was updated on August 3, 2026 and Standard Deviation on September 12, 2026.

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