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Osny Santos Netto
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As far as I know, Sizzy is the most known app to test responsiveness. As a paid user I really like all the features but whenever I open Sizzy to test my apps, my MacBook Pro overheats and basically everything gets frozen.
After testing Responsively I can tell you all that it lacks some cool features and some final touching but it's definitely way faster than Sizzy and that's what I loved so...
Responsively
Develop responsive web-apps 5x faster