This app has been updated by Apple to display the Apple Watch app icon. Unlocked the app special features for all users as a Christmas present. Fixed a bug that would crash the app when entering units. Disabled the currency converter until we find a new data stream. Fixed an error in the conversion factor for g/L in density.

We've been working on new ways of using unit conversions in complex ways. We've added a 'Gas Constant Converter' to the Premium Units. Those who have already purchased the 'Unlock App' in-app purchase will receive this for free. Three new unit categories have been added, including: 'Velocity (Angular)', 'Fuel Efficiency (Volume)' and 'Diffusivity'. Fixed issues where some very large or small conversions would yield zero values. Thanks to @Calvincookieman. Made the code more lightweight. Follow @Vector254 on Twitter!

Added a few units to specific enthalpy and specific entropy. Added two definitions for standard cubic feet values in moles and flowrate (molar) categories. Thanks to one of our users for suggesting this! Other minor bug fixes and enhancements.

We've done a bit of housekeeping to streamline navigation through the app! Switching between the calculator, currency converter and premium modules is now much easier and faster through a toolbar added to the main interface. Selecting/adding/removing currencies in the currency module is now much more efficient. We've also added conversions for Bitcoin, gold, silver, platinum and palladium. We've also rearranged some features from the prior release. The NIST menu is going away (for now) and we've made Thermocouples and Constants into their own separate modules, which are now only available to users who have purchased the "Unlock App" in-app purchase. The Math Help menu has been moved to the calculator. As always, we've made other bug fixes and minor enhancements.

We've added modules that utilize NIST standard reference data to the app! These include a really cool thermocouple calculator, values and symbols for over 300 physical constants and information on elements and compounds. For a limited time, these features will be available to all users After the next update, these new features will only be available to those who have purchased the "Unlock App" in-app purchase. We'll continue to add information like this moving forward as we make Engineering Unit Converter & Calculator a go-to source for science & engineering information and calculations! Other bug fixes and minor enhancements.

Due to an issue that was beyond our control, the Currency converter module may have stopped working for some users. This update fixes that issue. Other bug fixes and minor enhancements have also been addressed. Like us on Facebook at www.facebook.com/ChemEApp Follow us on Twitter: @Vector254

In order to focus on improving the experience for all users, ads have been temporarily removed from the app. Links to historical currency charts are now available in the Currency Converter. Just click the chart icon under the there letter currency code. A descriptive detail label has been added for each unit category. The Calculator module is now only available again to paid users, and can be unlocked via the in-app purchase!

First update of 2015! Use of the Calculator is open to all users for a limited time until we release the next update. Added 'Torque' to the list of units. Link to our Twitter feed @Vector 254 added to Settings+ Bug fixes & other minor enhancements.

A Calculator has been added to the app! And its not just any old calculator! Introducing the "Command Line Calculator". Use your keyboard to calculate values, but also to define variables and call functions! Command Line Calculator is unlocked as part of the "Remove Ads" in-app purchase. Also, the Mass to Mole Converter is also now part of the "Remove Ads" in-app purchase. Those who have already purchased "Remove Ads" will receive the Calculator and Mass to Mole Converter for free. We've also added an enhanced "Math Help" menu for everyone that provides an index of the functions that can be used as inputs in the converter cell and the calculator. Access this feature under Settings+. An improved rounding algorithm has been implemented to better show calculated values in standard or scientific notation. As in every update, we've implemented bug fixes and other minor enhancements to continuously improve the best unit converter available!

Added support for iOS 8. In preparing for some very cool future updates, we've added a few new unit categories that are available to everyone for free. We'll be adding more content to these in the near future. Check out links to our other awesome apps under 'Settings+'. As in every update, we've fixed bugs and made other minor app enhancements.

Customize the color scheme of Engineering Unit Converter to your preferences! Set the app to the colors of your favorite college team or whatever you like! 48 colors are available to mix and match. As an incentive to remove ads from the app, we have built an interface that allows the user to control the appearance of the main screen and unit converter cells. Once "Remove Ads" is purchased, the color control module will be enabled under 'Settings'. Those who have already purchased "Remove Ads" will see this enabled automatically.

Added a few new units under mass and moles. Resolved issue with unit preferences. Other minor tweaks and enhancements.

Fixed an issue where the user preferred units were not saved.

Lots of new features in 2.0! We've even added a few new unit categories. New look, easier to read unit conversion tables. We've improved the conversion results to better balance the display between decimal and scientific notation as needed. Units in each category can be reordered or hidden according to user preferences... keep the units you use most frequently at the top of the table or hide units you don't need. Look for the button on the top right of the table. Other minor improvements and bug fixes.

Added an inverse label to currency converter cells for ease of use. This is a convenient feature to quickly ascertain the relative value of the 'to' currencies. Improved precision in certain mass, length and area units.

Fixed issues relating to iOS 6 functionality, so those users are able to use the app again. Engineering Unit Converter is optimized for iOS 7.

Improved precision on certain unit conversion factors. Minor improvements and bug fixes.

Added a 'Currency' converter... look for the bright green cell and check it out! Minor improvements and bug fixes.

We added the ability to do math in the converter cells. Need to convert 1 5/8" to mm? There's no need to calculate 1 5/8 = 1.625 in your head first... Just enter 1+5/8 in the cell! Want to multiply 273.15 degrees C by 3 and convert to degrees F? 273.15*3 in the cell! Any valid mathematical expression will work, including constants like 'pi', 'rho', 'phi' and functions like sin( ), e^( ), cosh( ), sqrt(), factorials (i.e. 4!), etc. Minor tweaks and improvements to the Mass/Mole Converter interface and workflow. Other minor improvements and bug fixes.

We're evolving the concept of what a Unit Conversion app should be! This update offers a powerful and easy to use mass/mole converter as an in-app purchase. Quickly obtain composition data for an array of 2 - 100 compounds! Other minor fixes and tweaks also included.

User can make in app purchase to remove ads Enabled keyboard scrolling Increased number of significant figures displayed Visual improvements Other minor improvements and bug fixes

Corrected issue with acre conversion factor. Added kW (kilowatts) to power units. Updated look of app. Compatible with iOS 6.0 and up.

The user interface has been updated with the addition of a ton of engineering units.

The converters were updated and corrected in some cases. The app no longer requires any Go or Clear buttons.