Useful Plugins/Links for Testing WordPress and Making Quality Products.

• Detect the active theme on a given website: http://satoristudio.net/what-wordpress-theme/
• Detect the active theme and plugin on a given website: https://www.wpthemedetector.com/
• Download WP test data: http://wptest.io/
• Check theme in different-different device: http://www.responsinator.com/?url=rtcamp.com
• Google's mobile friendliness test: https://search.google.com/test/mobile-friendly
• Check the theme: https://wordpress.org/plugins/theme-check/
• Check the page speed: http://www.webpagetest.org/
• Official PageSpeed Insights by Google: https://developers.google.com/speed/pagespeed/insights/
• Check the MarkUp of theme: https://validator.w3.org/
• Test the website on different browsers and mobile devices: https://www.browserstack.com
• To see the maximum used devices world wide: http://gs.statcounter.com/screen-resolution-stats/desktop/worldwide
• Check the broken link of website: https://www.brokenlinkcheck.com/
• A quick and convenient way to find out what font is used on any site
  • Chrome Extension: https://chrome.google.com/webstore/detail/whatfont/jabopobgcpjmedljpbcaablpmlmfcogm?hl=en
  • Firefox add-on: https://addons.mozilla.org/en-US/firefox/addon/font-inspect/
• AMP Validator: https://validator.ampproject.org/
  • Chrome Extension: https://chrome.google.com/webstore/detail/amp-validator/nmoffdblmcmgeicmolmhobpoocbbmknc?hl=en