FxDiff is a comprehensive VST3 and AU plugin designed to analyze the behavior and effects of other audio plugins within your DAW. By placing FxDiff before and after the target plugin, it provides a detailed examination of how the plugin affects the audio signal. Its level matching capability ensures that comparisons between bypassed and processed signals are accurate, eliminating volume-based biases and allowing for precise assessment of plugin performance.

This plugin offers a range of analysis tools including frequency response measurement to visualize gain and phase changes, even for EQ plugins without dedicated curve displays. It also delivers insights into compression and distortion characteristics by revealing compressor gain reduction and nonlinear distortion curves. Additional features include Hammerstein analysis for identifying harmonic distortion behavior, spectrum analysis for frequency domain comparisons, and an oscilloscope for detailed waveform inspection in the time domain.

FxDiff further enhances plugin evaluation with auditory comparison functions that let you listen to differences or blends between bypassed and processed audio. It includes a signal generator to produce test tones such as sine waves and noise, facilitating thorough testing without external sources. Unlike typical host plugins, FxDiff analyzes plugins directly loaded in the DAW, making it an invaluable tool for in-depth plugin analysis during production.