REAL Software today announced that REALbasic 4, the next version of its cross-platform development solution for Mac OS 8/9, Mac OS X, and Windows, will ship in January 2002 for US$149.95. New features in version 4 include an improved interactive shell for better access to the command line, improved build and build settings, an all new ListBox, a new RbScript compiler, support for Mac OS X file name extensions, and more. All copies of REALbasic 3.5 purchased since December 1, 2001 are eligible for a free upgrade. Upgrades for other REALbasic owners range in price from $29.95 to $89.95.