Brassica is a new sound change applier. Its features include:

  • Can be used interactively both online and as a desktop application, or non-interactively in batch mode on the command-line or as a Haskell library
  • Natively supports the MDF dictionary format, also used by tools including SIL Toolbox and Lexique Pro
  • First-class support for multigraphs
  • Easy control over rule application: apply sound changes sporadically, right-to-left, and in many more ways
  • Live preview and control over output highlighting allows fast iteration through rules
  • Category operations allow phonetic rules to be written in both featural and character-based ways
  • Support for ‘features’ lets rules easily manipulate stress, tone and other suprasegmentals
  • Comes with a paradigm builder for quickly investigating inflectional and other patterns
  • Rich syntax for specifying phonetic rules, including wildcards, optional elements and more

And many more!

See the documentation for details on Brassica usage.

Download Brassica from the releases page. Alternately, try it online at As of the time of writing prebuilt binaries exist only for Windows. Instructions for building from source are available at

Image of Brassica with some example sound changes