How to preview website on smartphone

I am developing a website locally on my Mac, which I want to test on all possible devices - mainly desktop and smartphone. For developing locally I make use of CodeKit that enables me to preview all the changes immediately with a browser refresh. At the same time I would love to preview my website also on a separate mobile device - in my case a iPhone. Do you know any smart way how I can achieve a preview for my locally developed website?

Happy for any of your input...