Any way to validate (error-check) an entire site?

I’m currently using Ready to check - Nu Html Checker to validate individual pages of an existing site (700 pages). However, this is a slow process. I’d like to find some way to validate an entire site (or at least a folder and subfolders) in one pass. Then I could at least see which pages are error-free so these wouldn’t need further checking. Preferably this should be done to the local site rather than the online site where some pages may be outdated.

Don C.