The only tool that is open every single day of my working week bar none is Screaming Frog.
It is my go to tool for all things website.
This fantastic tool has bundles of features and even more when you purchase the license for just £149!
The free version will crawl and check in detail, up to 500 URLs and this limit is also removed when you buy.
A great tool, knocks spots of anything else out there and the free version is perfectly fine but the extra functions make the price an absolute steal.
Just to confirm, I am no way affiliated with Screaming Frog, I just use their tool to death!
What are you waiting for? Go grab it now for free and you will see what I mean!