Swipe right and left To move between the number, source and target units, swipe from the edges.

Use history Tap space or Next when entering the number to get to the history.

“Simple and effective” the first App Store review we got

Design

We have started from scratch. You have a number in your head, you want it converted stat. You do not want an endless list of categories distracting you.

We ask you for a number and strive to give you the answer with as little taps as possible. Ideally, with zero taps. That is why we check out your clipboard first. We use the units from the previous convertion before you change them. We show you your unit history before you have started typing the unit. We try to guess the target unit i. e. we know that it is natural to convert feet to meters, but miles to kilometers. We learn what you convert to make better guesses over time. We keep currency rates updated, but show you approximate values when offline. We support alternative spelling of many units.

The menu of categories will not get in your way if you don’t ask for it. But if you are curious, tap the source unit and then “select from list”.

Every screen of the app is as informative as possible. Even in the menu we show you the results of possible convertions with each unit.

Blog posts on the design of Ångström: