Test Regex expressions
Check DNS propagation all over the world
Check how your site/page looks from all over the world
Bulk test URLs
https://app.urlcheckr.com/requests
Single test redirects
https://redirectdetective.com/
Check meta tags
Browser cache busting
Make sure to check the “Disable cache” checkbox in your inspector to force it get a fresh version whenever your inspector is open!
Use your local “hosts” file to spoof DNS
on mac, you can add an entry to your /etc/hosts file to force your local computer to use a specific IP address for a domain. This is especially handy when about to launch a site as you can spoof the live domain to your server for final testing!