# API Reference

- `pyfftw` - The core
  - FFTW Class
  - Wisdom Functions
  - Utility Functions
  - FFTW Configuration
- `pyfftw.builders` - Get `FFTW` objects using a `numpy.fft` like interface
  - Overview
  - Supported Functions and Caveats
  - Additional Arguments
  - The Functions
- `pyfftw.builders._utils` - Helper functions for `pyfftw.builders`
- `pyfftw.interfaces` - Drop in replacements for other FFT implementations
  - Implemented Functions
    - `numpy_fft`
    - `scipy_fft`
    - `scipy_fftpack`
    - `dask_fft`
  - Additional Arguments
  - Caching