I was sceptical about the limits but it looks there are no daily limits now it and works fine for me.
Very useful set of tools I must say. My favourite is AI Article Generator, IMHO very customizable and better than most of content generators I tried.
Audit and SERP Analyzer tools are very solid and detail-oriented so I like them too.
I am not into WordPress so I can't say about it but again tools looks very solid and useful in the daily SEO work.