About TruAirspeed
TruAirspeed is a True Airspeed Calculator for the iPhone and iPad. It's a bit different from other true airspeed calculators, in which the pressure altitude is an input. This requires resetting the altimeter to the...
TruAirspeed is a True Airspeed Calculator for the iPhone and iPad. It's a bit different from other true airspeed calculators, in which the pressure altitude is an input. This requires resetting the altimeter to the standard sea level pressure of 29.92"Hg to read the pressure altitude. With TruAirspeed, you input the indicated altitude and the Kollsman window's pressure setting - the app then calculates the pressure altitude, density altitude, true airspeed and mach number for you. The calculations involved take full account of compressibility effects, but not shock waves, so it's limited to subsonic, non-transonic flight only. You have a choice of units for inputs and results, and you may choose either a calculator-style keypad (top row: 7-8-9) or a telephone-style keypad (top row: 1-2-3). You may also set a correction factor for your bird's airspeed indicator/pitot-static system, if you know it (mine is 0.95).
Version History Due to changes in the iPad coding environment, I've had to make some major "under the hood" changes to TruAirspeed. While its appearance on iPads has changed a bit, features and functionality are unaffected. Following a user's suggestion, I've also enlarged the main screen layout on iPads for better usability when flying. I've also updated the app for operation under iOS18 and iPadOS18, and for compatibility with all current iPhone and iPad models. 2.1 07/08/2025 TruAirspeed can now be used in landscape mode on all iPhone models (except the 1st generation iPhone SE). I've updated the app for operation under iOS17 and iPadOS17, and for compatibility with all current iPhone and iPad models. I've fixed a bug with the ASI correction factor. I've also done a significant amount of code cleanup. Otherwise, features and functionality are unchanged. 2.0 06/25/2024 In Version 1.4, TruAirspeed has been updated for operation under iOS15 and iPadOS15, and for compatibility with all current iPhone and iPad models. I have also added my Privacy Policy to the Info screen. Otherwise, appearance, features and functionality are unchanged. 1.4 06/17/2022 In Version 1.3, TruAirspeed has been updated for operation under iOS13 and iPadOS13, including Dark mode. Also, a few bug fixes and minor aesthetic changes have been made 1.3 06/30/2020 Version 1.2 has a number of notable improvements: − The app now calculates and displays the mach number as well as the true airspeed. − TruAirspeed is now a universal app (for those, like me, who also use this app on their iPads). The iPad version supports both portrait and landscape orientations, but is full screen only. − The input keypad now plays nicely with touch cursor positioning and range selection. − The iPad version of the input keypad also has cursor keys and a "restore" key which restores the input field to it's initial value at the start of editing. − The input keypad background now has a more aesthetically pleasing appearance. − There are also many "under-the-hood" improvements. 1.2 03/18/2018 Version 1.1 has mostly "under the hood" mods for compatibility with iOS 9.3 and later (earlier iOS versions are no longer supported). There are also a few significant user interface changes: − The default input keypad is now a calculator-style keypad (top row: 7,8,9). However, you may choose a telephone-style keypad (top row: 1,2,3) in the preferences. − You may now enter decimal numbers in all input fields. The calculations will use the decimal inputs for all calculations; however, except for the pressure, the input and output fields will display the numbers rounded to the nearest integer value. − You may enter negative numbers in all input fields, but negative numbers entered in the IAS and Kollsman fields will be converted to positive numbers for the calculations. − All limits on input numbers have been removed. However, you should keep the following in mind: 1. This app uses the standard tropospheric atmosphere model, which is not valid above the tropopause. (The International Standard Atmosphere assumes this to be 36,000 feet, but it can vary from 20,000 feet at the poles to 60,000 feet at the equator.) 2. While this app accounts for compressibility effects in the calculations, it does not account for shock waves, which will appear at transsonic and supersonic speeds. 1.1 04/23/2017 1.0 04/10/2014
Previous Versions
Here you can find the changelog of TruAirspeed since it was posted on our website on 2023-09-06 23:21:08.
The latest version is 2.1 and it was updated on 2026-06-24 15:02:45. See below the changes in each version.
TruAirspeed version 2.1
Updated At: 2026-06-03
Changes: Version History Due to changes in the iPad coding environment, I've had to make some major "under the hood" changes to TruAirspeed. While its appearance on iPads has changed a bit, features and functionality are unaffected. Following a user's suggestion, I've also enlarged the main screen layout on iPads for better usability when flying.
I've also updated the app for operation under iOS18 and iPadOS18, and for compatibility with all current iPhone and iPad models. 2.1 07/08/2025 TruAirspeed can now be used in landscape mode on all iPhone models (except the 1st generation iPhone SE).
I've updated the app for operation under iOS17 and iPadOS17, and for compatibility with all current iPhone and iPad models.
I've fixed a bug with the ASI correction factor.
I've also done a significant amount of code cleanup.
Otherwise, features and functionality are unchanged. 2.0 06/25/2024 In Version 1.4, TruAirspeed has been updated for operation under iOS15 and iPadOS15, and for compatibility with all current iPhone and iPad models. I have also added my Privacy Policy to the Info screen. Otherwise, appearance, features and functionality are unchanged. 1.4 06/17/2022 In Version 1.3, TruAirspeed has been updated for operation under iOS13 and iPadOS13, including Dark mode. Also, a few bug fixes and minor aesthetic changes have been made 1.3 06/30/2020 Version 1.2 has a number of notable improvements:
− The app now calculates and displays the mach number as well as the true airspeed.
− TruAirspeed is now a universal app (for those, like me, who also use this app on their iPads). The iPad version supports both portrait and landscape orientations, but is full screen only.
− The input keypad now plays nicely with touch cursor positioning and range selection.
− The iPad version of the input keypad also has cursor keys and a "restore" key which restores the input field to it's initial value at the start of editing.
− The input keypad background now has a more aesthetically pleasing appearance.
− There are also many "under-the-hood" improvements. 1.2 03/18/2018 Version 1.1 has mostly "under the hood" mods for compatibility with iOS 9.3 and later (earlier iOS versions are no longer supported). There are also a few significant user interface changes:
− The default input keypad is now a calculator-style keypad (top row: 7,8,9). However, you may choose a telephone-style keypad (top row: 1,2,3) in the preferences.
− You may now enter decimal numbers in all input fields. The calculations will use the decimal inputs for all calculations; however, except for the pressure, the input and output fields will display the numbers rounded to the nearest integer value.
− You may enter negative numbers in all input fields, but negative numbers entered in the IAS and Kollsman fields will be converted to positive numbers for the calculations.
− All limits on input numbers have been removed. However, you should keep the following in mind:
1. This app uses the standard tropospheric atmosphere model, which is not valid above the tropopause. (The International Standard Atmosphere assumes this to be 36,000 feet, but it can vary from 20,000 feet at the poles to 60,000 feet at the equator.)
2. While this app accounts for compressibility effects in the calculations, it does not account for shock waves, which will appear at transsonic and supersonic speeds. 1.1 04/23/2017 1.0 04/10/2014
TruAirspeed version 2.1
Updated At: 2025-07-08
Changes: Jul 8, 2025
Version 2.1
Due to changes in the iPad coding environment, I've had to make some major "under the hood" changes to TruAirspeed. While its appearance on iPads has changed a bit, features and functionality are unaffected. Following a user's suggestion, I've also enlarged the main screen layout on iPads for better usability when flying.
I've also updated the app for operation under iOS18 and iPadOS18, and for compatibility with all current iPhone and iPad models.
TruAirspeed version 2.1
Updated At: 2025-07-08
Changes: Due to changes in the iPad coding environment, I've had to make some major "under the hood" changes to TruAirspeed. While its appearance on iPads has changed a bit, features and functionality are unaffected. Following a user's suggestion, I've also enlarged the main screen layout on iPads for better usability when flying.
I've also updated the app for operation under iOS18 and iPadOS18, and for compatibility with all current iPhone and iPad models.
TruAirspeed version 2.0
Updated At: 2024-06-25
Changes: Jun 25, 2024
Version 2.0
TruAirspeed can now be used in landscape mode on all iPhone models (except the 1st generation iPhone SE).
I've updated the app for operation under iOS17 and iPadOS17, and for compatibility with all current iPhone and iPad models.
I've fixed a bug with the ASI correction factor.
I've also done a significant amount of code cleanup.
Otherwise, features and functionality are unchanged.
TruAirspeed version 1.4
Updated At: 2022-06-17
Changes: Jun 17, 2022
Version 1.4
In Version 1.4, TruAirspeed has been updated for operation under iOS15 and iPadOS15, and for compatibility with all current iPhone and iPad models. I have also added my Privacy Policy to the Info screen. Otherwise, appearance, features and functionality are unchanged.
Disclaimer
Official App Store Link
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