Density Altitude +2.8

Instant and location accurate Density Altitude calculator/instrument app for iPhone and iPad that also finds relative air density (RAD), altimeter setting, relative humidity, specific humidity (grains/lb) and more. Super useful for pilots, especially in the backcountry. Many other uses for engine tuning, racing, sports, etc.

* Seamlessly integrates weather data, GPS and your phone's onboard barometer to quickly and accurately calculate your density altitude, altimeter setting, relative air density, and more.

* Takes humidity into account in all calculations, making it more accurate than the typical dry bulb approximation formula used by AWOS/ASOS, etc.

* Works anywhere. Great without cellular connection as well, which makes it all the more useful in the backcountry and far away from ASOS/AWOS stations.

* Location Search: Find atmospheric data (Density Altitude, etc.) at any point on Earth, from anywhere!

Data Sensed and Calculated (all calculated with humidity):

* Density Altitude
* GPS Altitude
* Temperature
* Altimeter Setting
* Absolute Pressure
* Dew Point
* Relative Humidity
* Specific Humidity (grains/pound)
* Air Density
* Relative Air Density (RAD)
* Dyno Correction

The quickest way to get your Density Altitude! On the iPhone 6/6+ and newer iPads, it will use the built-in barometer and GPS. If you're in cell range, you don't need to supply any data. If you're out of cell range, all you need to supply is the outside air temperature. Designed not to need an internet connection, so it will work anytime and anywhere you need it.

Great tool for pilots, drag racers, engine tuners, golfers, or anyone who needs to conveniently find their Density Altitude, Altimeter Setting, Relative Aid Density (RAD), Specific Humidity or Absolute Pressure.

No ads or in-app purchases.

We love feedback! Email us at densityaltitude@rateofclimb.com

Disclaimer:
Density Altitude+ uses available third party weather and elevation data to calculate atmospheric measurements, but Rate Of Climb does not guarantee that the original sources (including the National Weather Service, FAA and others) have provided data that is accurate, complete, timely, or properly formatted. Users should always contact official sources for the most accurate and timely updates.

The service is not intended for use in situations in which the failure of the service could lead to death, personal injury, or severe physical or environmental damage. Your use of this application is at your sole risk.

Version History Bug fix: When using Density Altitude outside of cell service, Density Altitude+ now again correctly uses Onboard barometer. The issue was a recently added iOS privacy setting.
If you're a current user and are still not prompted to allow the app to access the barometer, you can go into Settings-> Privacy & Security-> Motion & Fitness and enable access for Density Altitude+ there.
Thanks for your support! Reach me at densityaltitude@rateofclimb.com 2.8 08/09/2024 This version uses a new Elevation API provider since our previous Elevation API provider is shutting down. This only affects the location search feature, and accuracy should be even better!
Follow us on Instagram @RateOfClimbIndustries. Thanks for the support! 2.7 07/01/2023 - Increased GPS accuracy in certain situations. This should make GPS elevation data more accurate in areas with obstructions, etc. 2.6.3 10/23/2022 - UI improvements
Reach us any time at densityaltitude@rateofclimb.com. IG: @rateofclimbindustries
Thanks for the support! 2.6.2 06/22/2022 Improvements to the way Location Service permissions are handled. App would in certain edge cases crash if Location Services were turned off and user tapped GPS Location button. This is now fixed.
email us anytime at densityaltitude@rateofclimb.com
Follow us on Instagram @rateofclimbindustries 2.6.1 10/26/2021 New Major Feature: Location Search! You can now compute the Density Altitude and all other atmospheric data at any point on earth, from anywhere on Earth! Either type in you location search or Long Press on any location on the map.
Use this feature to see what conditions are at another location for educational purposes. Since calculations are based on weather data fetched from a weather API and not on actual physical readings, the results won't be as accurate as in the default "Instrument" mode, but will be as close as possible. The same goes for elevation data, which is based on an elevation API and not GPS altitude as it is in Instrument mode.
Bug fix: Parts of the display were being clipped on iPhone 6s. This is now fixed.
Improvement: General display polish
Bug fix: humidity was sometimes not properly applied when certain units were chosen. This is now fixed.
Improvement: Updated for iOS 15.
Follow us on Instagram @RateOfClimbIndustries 2.6 10/19/2021 - New weather source: Our previous weather information source (used for temperature and dew point) is unfortunately going offline. The good news is that we have upgraded to an even more accurate and feature-rich weather source, which will make some exciting new features possible that we're currently working on. 

Reach me anytime at densityaltitude@rateofclimb.com for support, questions or suggestions. Find us on Instagram @rateofclimbindustries 2.5 08/27/2021 - New Sharing option in Settings
- New Animations added in transitions
- Other minor updates
Reach me anytime at info@rateofclimb.com. Follow us on Instagram and Facebook @rateofclimbindustries 2.4 02/04/2021 - New weather data source. Since the forecast.io weather API will be discontinued in January, I've done a lot of research to find the most suitable replacement going forward. This version uses Climacell which provides global, hyperlocal weather data. My hope is that it will provide even more accurate data. I've done a lot of testing, but let me know with the in-app feedback button if you have any issues. Thanks!
Thanks for all the support, and reach me anytime at: info@rateofclimb.com. You can also follow us on Instagram @rateofclimbindustries. 2.3 10/14/2020 * New Manual Mode feature: By default Density Altitude+ functions as a real-time instrument, showing you the current conditions where you are, using on-board sensors, weather data and a lot of physics. Version 2.2 adds a Manual mode which is useful for planning or trying out scenarios. Tap the slider icon in the top right of your screen to toggle Manual Mode on or off. Once in Manual Mode, you can set Altitude, Temperature, Dew Point, Station or Absolute Pressure and/or Altimeter Setting. The app will dynamically calculate all other values. Toggle back to Automatic Mode to get your local, current conditions.

I always welcome feedback and feature requests. Contact me anytime through the email link in the settings menu, or at info@rateofclimb.com 2.2 08/27/2020 - This version adds more calculated data helpful for racers and engine tuners:
- Specific Air Density in grains per pound of dry air
- Dyno Correction
- Now has a scroll view to fit more data onto small screens
Thanks for the great feedback! Email us anytime at info@rateofclimb.com 2.1 05/20/2020 The original, now better than ever:
* Humidity is now considered in all calculations, making Density Altitude+ more accurate than most available density altitude reports, especially when humidity is high.
* New: Native iPad app included!
* New: Relative Density (RAD): Very useful for engine tuning and racing
* New: Air Density in kg/m3
* New: Relative Humidity
Thanks for the support and feedback! You can always reach us at info@rateofclimb.com 2.0 10/17/2019 * Completely redesigned to be even more easy to use!
* Updated for the latest devices.
Reach us at info@rateofclimb.com, @deepweatherapp on Twitter, or RateofClimbIndustries on Facebook! 1.6 11/22/2017 Bug fix: App launch crash that would occur in certain geographic areas has been fixed.

Thanks for all the great feedback! If you like Density Altitude+, leave a review in the app store.
If you have comments or suggestions, we'd love to hear from you at info@rateofclimb.com. 1.5.1 05/10/2016 * New Temperature Nudge feature: Tap the forecast.io - derived temperature to override it with your own temperature observation.
* Now displays the nearest locality if network is available.
* Improved error message if GPS is disabled.

Please take a moment to rate Density Altitude+ in the app store if you like it. It really helps!
For support or feedback, reach us by email: info@rateofclimb.com, or on Facebook: RateOfClimbIndustries 1.5 02/24/2016 - Now allows pressure, height and temperature units to all be set independently. For example, you can now use Celsius for temperature while using inHg for pressure, etc.
- Updated for iOS 9

We love feedback! Please take a moment to rate us in the App Store, or email us at info@rateofclimb.com. Thanks! 1.4 10/22/2015 Now allows for separate Metric/Imperial units for height and pressure. You can now have pressure in hPa and altitude in ft, etc.

Reach us at info@rateofclimb.com.
Follow us on Twitter at @DeepWeatherApp

Thanks for your feedback and support! 1.3 07/02/2015 * Seamlessly integrates forecast.io weather data when in cell range
* Higher contrast display
* New icons for barometer and internet data shows where the data is coming from.
* Seamlessly adapts to no-cell areas and older phones. 1.2 06/12/2015 1.0 05/23/2015