Is Cappex a reliable website when it comes to calculating college admissions?

I recently made a cappex account to test out my admission chances with the schools that I applied too. It seemed very convincing, but wanted to know if it was a practical website.

For top 50 schools it is a waste of time because it cannot evaluate holistically.

For me I’m chancing UC schools. Would it be more reliable in that case?

If instate yes as the UC’s are GPA focused.

I think a far better source is college navigator. It uses the common data set