au fait vs au courant

au fait and au courant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
au fait	No	Yes	No	No
au courant	No	Yes	No	No

As adjectives, au fait and au courant are synonyms defined as:

au fait and au courant: being up to particular standard or level especially in being up to date in knowledge

Other synonyms of au fait include abreast, up on.

au fait (adjective)	au courant (adjective)
being up to particular standard or level especially in being up to date in knowledge	being up to particular standard or level especially in being up to date in knowledge