au courant vs au fait

au courant and au fait both are adjectives.

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

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

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

Other synonyms of au courant include abreast, up on.

au courant (adjective)	au fait (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