Houdah Software today announces Quid 4.0, an update to their popular universal currency converter for iPhone and iPod touch devices. Formerly known as ACTCurrency, Quid draws on a source of exchange rates for over 180+ world currencies and precious metals. Users may also add extra currencies and key in exchanges rates. Version 4.0 brings a fresh new design by Lars Herrmann. It is a free update and is recommended for all users.