The Hierarchical Asynchronous Circuit Kompiler Toolkit (HACKT) is a project originally developed at Cornell University for aiding the design of asynchronous circuits. The project continues to be maintained by David Fang, the original author.

HACKT contains a collection of tools to aid asynchronous circuit design. (It is also usable for synchronous circuit design.)

As a testament to its scalability, HACKT has been used to design, simulate, and test generations of multi-billion transistor chips at Achronix Semiconductor since 2008.