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Heresy is a BASIC-inspired functional dialect of Lisp, currently implemented as a Racket language.

Heresy aims to provide a simple, semi-pure functional Lisp language that is nevertheless familiar to programmers of BASIC, by providing a combination of familiar control structures and features with purely functional execution.

The official documentation and reference can be found here:

Heresy is chiefly written by myself, with considerable contributions from Alex Knauth, and several others in the Racket community. The code Copyright 2014 by Annaia Danvers, and is licensed via the LGPL v3.


To install:

raco pkg install heresy

To use, append this to the start of your file in DrRacket or your favorite text-editor:

#lang heresy


Pull requests should be made against the develop branch. master is reserved for the current release, as it is the source for the raco package for Heresy.