A quick heads up that you can grab a phenomenal bargain on Scrutiny at the moment at https://bundlehunt.com for $8. It normally costs $115 and it’s an amazing tool for web designers to help with troubleshooting and SEO etc.
You can read more about Scrutiny here and the developer Shiela Dixon is super helpful. I’ve used Integrity Pro in the past for spotting errors, sitemaps & spell checking etc, so grabbing Scrutiny for $8 is a no brainer if you are building websites. It’s arguably the best product of its kind.