SWAP units by pressing button on keypad (lower left) OPTIMIZED for iPhone X and Retina display - works on 3.5 inches and new 4 inches screens. ***Now with LIVE Currency Updates for all major currencies in the world*** Very simple and beautifully designed unit converter with 12 categories and many different units: CONVERT: *Area *Currency (155 world currencies updated every 15 min.) *Data-computer data (byte, kilobyte, megabyte, etc.) *Fuel-milage *Length *Power *Pressure *Speed *Temperature *Time (days, weeks, hours, etc.) *Volume (dry and wet) *Weight-mass Currency exchange rates are downloaded every 15 minutes when app is open. Every download uses very small amount of data. Around 1-2kb. Internet connection required. 155 currencies available - This is all world currencies with their respective country flags.