FFTW - Fastest Fourier Transform in the West


FFTW" stands for "Fastest Fourier Transform in the West." FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of arbitrary input size, and of both real and complex data, as well as of even/odd data, i.e., the discrete cosine/sine transforms, or DCT/DST.

FFTW’s speed is superior when compared to other publicly-available DFT programs and its performance is highly competitive with that of vendor-driven solutions. FFTW is also portable, so it will work well on most architectures without modification – something vendor-driven custom applications cannot match.

Ready to Sign License Available

Please visit our Ready to Sign instructions page to learn how to request a license. FFTW is available under two distinct licensing options:

1.    Free Open Source License

The GNU GPL version of FFTW is made available via Open Source licensing. You are free to redistribute it and/or modify it under the terms of the GNU General Public License version 2 as published by the Free Software Foundation.

2.    Commercial License Options and Pricing

The four types of licenses available for FFTW and their respective costs include the following (please click on either type below to download the license as a fillable PDF): 

Contact the TLO to request a Government Contractor or Agency license.

Questions? Contact software-licenses@mit.edu.