You are as active as I/she/he.

Hi expert teachers,

Is my correct good?
You are as active as I/she/he. Correct
You are as active as me/her/him. Incorrect

Many thanks in advance.

“Is my correction good?”

It’s not that straightforward. There are plenty of discussions on the forum comparing the formal’I’ to the informal, but more frequently used ‘me’ on these forums.