Integrity 4+

This is honestly one of the oldest apps I have from the App Store, but I still install it on all my machines and use it regularly.

Why? Because despite looking, I haven't found an app that is this simple but still powerful enough to do what I need to do. I don't manage any huge sites, but I use this to regularly check many, many smaller sites that have rapidly changing information where links can be broken/out of date quickly and it works great.

Results are easy to read & understand broken down by error types. I especially appreciate that it shows you links that are found, but have been moved (200, 301, 302) as well as including all checked URLs that have no error in the output.

Finally - this app is from an era I miss: the one where "the developer does not collect any data from this app." Thanks!!

I have a site with 4576 images and every other dead link checker I have tried stops after a max of 3000, usually way less.

This little treat is so powerful and customizable the way it searches, I have found dead links I did not even have a clue exisisted.

I will use it for all my other sites now too, I only sought it out to check this big site, but who knows what I am missing with the other free ones!

I had to check my company's website for bad links but all the options I can find were paid or terribel ro both. This app is free, runs locally, and seems quite powerful if you kow what you're doing. Because it is an older application its not as speedy as some neweroption but I'll take the tradeoff.
Highly recomended.