The best alternatives to Viewport are Monkey Test It, Test Anywhere, and slashB. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Viewport?
Hurree— The smarter, simpler way to analyze your data
Monkey Test It offers a hands off approach to automated testing that lets you focus on making your site look good, without having to get bogged down in learning testing tools. You don't need to write a single line of code; all you need to do is specify the URL and we'll take care of the rest.
For web developers to scan their website and get a health checkup on everything that goes into making a safe, secure, fast and effective website that follows industry best practices.