IntervalZero, Inc. develops hard real-time software and its symmetric multiprocessing (SMP) enabled RTX and RTX64 software transform the Microsoft Windows general-purpose operating system (GPOS) into a real-time operating system (RTOS).

IntervalZero, Inc.
IndustryComputer software
HeadquartersWaltham, Massachusetts, USA
Key people
Jeffrey D. Hibbard, CEO
Footnotes / references
Formerly: Ardence, Inc., VenturCom

IntervalZero and its engineering group regularly release new software (cf its history).[1]

Its most recent product, RTX64, focuses on 64-bit and symmetric multiprocessing (SMP) to replace dedicated hardware based systems such as digital signal processors (DSPs) or field-programmable gate arrays (FPGAs) with multicore PCs.[2]

For instance, an audio mixing surface manufacturer which largely deployed DSP based systems, switched to personal computer (PC) based systems, dedicating multi-core processors for the real time audio processing.

Founded in July 2008 by a group of former Ardence executives, IntervalZero is headed by CEO Jeffrey D. Hibbard. The firm has offices in Waltham, MA; Nice, France; Munich, Germany, and Taiwan, ROC.

This global presence is important because these solutions are deployed worldwide, primarily in industrial automation, military, aerospace, medical devices, digital media, and test and simulation software.

The corporate name, IntervalZero, comes from the firm's mission to deliver deterministic, hard real-time functionality. An "interval of zero" is the technical definition of the optimal experience between a system command and execution.


IntervalZero's lineage traces back to 1980, when a group of Massachusetts Institute of Technology (MIT) engineers started VenturCom and began to develop expertise in embedded technology. It was during this time that Venix was developed and marketed.

Their first innovation was to focus on Windows NT 4.0 as a possible real-time solution for the Industry in 1995 by releasing RTX.[3] Since then, a lot of controllers are PC and Windows based.

Their second innovation came as a second product, Component Integrator, which makes Windows NT 4.0 an embedded OS. It was licensed by Microsoft a few years later and became the origin of Windows NT Embedded.[4]

In 2004, VenturCom, was renamed Ardence.

On 20 December 2006, Citrix Systems announced an agreement to acquire Ardence's enterprise and embedded software businesses and integrated the software streaming products into the Citrix portfolio in 2007 and early 2008.[5]

In 2008, a group of former Ardence executives founded IntervalZero and acquired the Ardence embedded software business from Citrix Systems Inc.[6] Citrix retained a minority ownership the firm.


IntervalZero develops the following products:

  • RTX and RTX64 hard real-time software transforms Microsoft Windows into a real-time operating system (RTOS).

Executive Officers

  • Jeffrey D. Hibbard, Chief Executive Officer
  • Mark Van Vranken, Chief Financial Officer
  • Brian Calder, Vice President, North America Sales & Marketing
  • Daron Underwood, Vice President, CTO
  • Brian Carter, Vice President, Strategic Communications
  • Bryan Levey, Vice President, Engineering


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