MacSpell is a spell checker designed on Cocoa's spell-checking facilities.

• Pure command line utility
• Interactive spelling checker capability
• Can act as Ispell replacement (ispell -a)
• All dictionaries included, it uses the dictionaries provided by macOS.

$ pip install macspell

$ macspell --check README.txt
$ macspell --encoding=latin1 --check LEIAME.txt

;; MacSpell
(setq ispell-program-name "macspell")
(setq ispell-extra-args '("--encoding=latin1" "--auto-lang=no"))
;(setq ispell-dictionary "english")

set speller "macspell -x -c"