Helvetica compromises...the spacing has ended up much looser than Miedinger's wonderfully tight original at display sizes but much too tight for comfortable reading at text sizes." iOS used first Helvetica then Helvetica Neue as its system font. All releases of macOS prior to OS X Yosemite used Lucida Grande as the system font. The version of Helvetica Neue used as the system font in OS X 10.10 is specially optimised; Apple's intention is to provide a consistent experience for people who use both iOS and OS X. Apple replaced Helvetica Neue with San Francisco in iOS 9 and OS X El
Helvetica add subtle differences. Substitute Helvetica designs that have survived into or originated during the digital period have included Monotype's Arial, Compugraphic's CG Triumvirate, ParaType's Pragmatica, Bitstream's Swiss 721, URW++'s Nimbus Sans and Scangraphic's Europa Grotesk. Berthold itself responded to Helvetica's popularity with Akzidenz-Grotesk Buch, effectively a Helvetica clone. Besides Helvetica imitations, Helvetica was available in custom derivatives with unusual special-order characters for many years, notably a straight-legged 'R' and round-topped 'A'. CNN uses a custom derivative, "CNN Sans", which has a '1' with a base. URW (later URW++) under the leadership of Peter Karow produced a modification of Helvetica called