Are both sentences OK?
I'm planning to invite someone for something.

If I say;
I was wondering if you're free tomorrow.
I was wondering if you're doing anything tomorrow.

Question

Are both sentences OK?
I'm planning to invite someone for something.

If I say;
I was wondering if you're free tomorrow.
I was wondering if you're doing anything tomorrow.

Answer

Both are correct meaning you would like company and are inviting the other person to visit you or you visit them.