mborgerding/kissfft

Health v2 · maintenance only

Flags: no_license

Adoption not part of the score

1972 stars · 362 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

KISS FFT is a mixed-radix Fast Fourier Transform library written in C that supports fixed-point and floating-point data types. It is designed for simplicity, easy integration into C programs, and permissive licensing rather than maximum performance.

Use cases

• compute FFT of audio samples in C
• add a small FFT library to an embedded project
• perform real-optimized FFT for spectrum analysis
• do fast convolution FIR filtering
• generate spectrum images from signals
• use fixed-point Q15/Q31 FFT on DSP hardware

When to choose

• you need a simple, easily embeddable FFT in C
• you need fixed-point FFT support for embedded targets
• trivial licensing matters more than peak performance
• you want multi-dimensional or real FFTs with minimal setup

When to avoid

• you need maximum FFT performance (use FFTW or MKL)
• you need GPU-accelerated transforms
• you need highly optimized SIMD paths beyond basic SSE

Facets

library · maturity stable

math audio-processing image-processing embedded-systems cross-platform c cpp embedded fft dsp signal-processing fixed-point mixed-radix spectrum-analysis algorithms audio

Member repositories

For agents

markdown · JSON · MCP: product_card(name="mborgerding/kissfft")