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A cross platform visual business Basic development system for 32-bit OS/2 and 16-bit MS Windows that offered a number of RAD tools including a forms builder, report writer, and a debugger. Later versions were also delivered in a separate 32-bit Windows version although initially it compiled 16 bit-Windows executables only but the last version offered target support for Win32s, Windows NT and Windows 95.

Note that software developed under versions 1 and 2 of the compiler does not work under Windows 2000 or later. Software developed with version 3 will work in any 32-bit version of Windows, but apparently not in any of the 64 bit version unless it is specifically compiled for the Windows NT target.


REALIZER was initially released in 1991 by Within Technologies, Inc., Mt. Laurel, NJ managed by Joseph Venuto.

REALIZER was designed by Terry L. Lucas and Peter J. Maruhnic (developers of THINK's Lightspeed Pascal Version 1.0, Apple Macintosh Pascal Version 1.0, and InBox), Steven A. Cohn (formerly on the Microsoft QuickC PM team), and Michael Hyman (formerly on Microsoft's OS/2 team).


Within Technologies
  • May 1991: REALIZER v1
  • 1992: CA Realizer 1.0 for OS/2 and MS Windows
  • 1993: CA Realizer 2.0 - Has rudimentary 32-bit Windows and Win-OS/2 support but does not work with modern 64 bit Windows systems and neither do programs developed with the system.
Version 2.07 from 1994 is the last known version of the 2.x branch that has full OS/2 support.
  • 1996: CA Realizer 3.0a - No OS/2 executable, the only version to contain a true 32bit Windows executable. Works with modern 64 bit Windows systems.



  • Michael Hyman: Windows 3.0 For BASIC Programmers - Addison Wesley 1991, ISBN 0-201-57031-9
  • Straley: Straley's Guide to Programming with CA-Realizer - Addison-Wesley, ISBN 0-201-40944-5