Ångström the unit converter is a free iPhone app developed by Alexander Babaev. It falls under the category of Business & Productivity and aims to provide users with a fast and efficient way to convert units, currencies, and timezones.

With Ångström, you can convert units, currencies, and timezones faster than you can type. Simply start with the number you want to convert, then type one or two letters to see the result. The app even has a dedicated numpad to avoid the hassle of switching keyboards. It also has a convenient clipboard feature that automatically picks up numbers for conversion.

One of the standout features of Ångström is its ability to learn from your conversions and make better guesses over time. It keeps currency rates updated and offers approximate values when you're offline. The app also supports alternative spellings of many units, making it even more versatile.

Whether you need to convert Fahrenheit to centigrade or feet to meters, Ångström has got you covered. It even knows that it's more natural to convert feet to meters, but miles to kilometers. For additional features like timezones conversion and more units, you can make an in-app purchase or show your support by upgrading.

Overall, Ångström the unit converter is a handy tool for anyone in need of quick and accurate unit conversions on their iPhone. Its intuitive interface and efficient conversion process make it a valuable addition to the Business & Productivity category.