Suggestions for Responsive Web Design Testing

Hello everyone,

I’m investigating which testing tool will be best option for Responsive Web Design Testing.
Actually this is my firend’s question. She said me that they use Saucelabs, but everyone suggests them Amazon Web Services. They do not prefer Appium because of the system is not a mobile system, it is Responsive Design Website.
I did not use that tools, so I do not have any idea about them. Can anyone help if they used AWS or Saucelabs, or another tools for RWD Testing ?

Thanks :slightly_smiling_face: