Contrast and Separation Metrics for Phonological Categories R package phontrast version 2.4.1 Computes and compares multiple measures of separation and overlap between phonological categories (for example vowels or consonants) in arbitrary multi-dimensional acoustic spaces such as formant values, mel-frequency cepstral coefficients (MFCCs), duration, or learned embeddings. The main entry point, phontrast(), reports several contrast metrics in one call -- Jensen-Shannon divergence and distance (Lin, 1991) <doi:10.1109/18.61115>, the Pillai-Bartlett trace, Bhattacharyya distance and affinity, Mahalanobis distance, and proportional overlap -- globally or by group on a common separation-oriented scale, with bootstrap confidence intervals. Also provides utilities for preparing estimates for downstream modelling such as generalized additive models and mixed-effects models. Formerly released as 'phonJSD'. Software Depends: R (>= 4.1.0) Imports: ks, dplyr, purrr, tibble, rlang, stats, grDevices, utils Suggests: ggplot2, mgcv, mvtnorm, tuneR, testthat (>= 3.0.0), knitr, rmarkdown Grant M. Berry <berry.grant@gmail.com> Comprehensive R Archive Network (CRAN) Grant M. Berry [aut, cre] MIT + file LICENSE (https://CRAN.R-project.org/package=phontrast/LICENSE) 2026-09-01 application/tgz https://CRAN.R-project.org/package=phontrast doi:10.32614/CRAN.package.phontrast