up on vs au courant

up on and au courant both are adjectives.

Word	Noun	Adjective	Verb	Adverb
up on	No	Yes	No	No
au courant	No	Yes	No	No

As adjectives, up on and au courant are synonyms defined as:

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

Other synonyms of up on include abreast, au fait.

up on (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