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To download Responsive Resize from the Mac App Store, you need a Mac with OS X 10.6.6 or later. Learn More.

Responsive Resize

By Duncan Midwinter

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Responsive Resize is a tool for aiding development and testing of responsive websites. Responsive resize works like a mini-browser with an adjustable viewport which can be altered to match the dimensions of virtually any mobile, tablet or desktop device.

Responsive Resize comes with over 40 preset virtual devices, but you can also add as many new devices as you requires.


History remembers up to 25 sites
Status bar gives load times.
Over 40 preset Mobile, Tablet & Desktop devices
Ability to create as many new devices as you require
Ability to choose from preset User Agent Strings - or enter any string you require
Rotate Device
Ability to quickly adjust the viewport
Increase or decrease the with by a set value
Light or Dark application theme
Fullscreen mode
Devices panel
Preferences panel

What's New in Version 1.3

Added user-agent strings for iOS7 (iPhone and iPad) and user-agent string for Safari 7 (Mac)


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Customer Reviews


This is what we do for a living, build mobile ready responsive websites and this will be an invaluable tool going forwrd. Another great thing is you can add custom devices with sizes. Why is that helpful you ask? Because a lot of our clients are running Internet Explorer 10-11 on crummy low-res hardware and you can’t expling to them why the site doesn’t look good on their system! So, this is a great way to test other resolutions so that you can visually show them whats going on with their site, and make some tweaks if needed to adjust to their resolutions so they are happ.

Responsive Resize
View in Mac App Store
  • $2.99
  • Category: Developer Tools
  • Updated: Feb 19, 2014
  • Version: 1.3
  • Size: 2.3 MB
  • Language: English
  • Seller: Duncan Midwinter

Compatibility: OS X 10.8 or later, 64-bit processor

Customer Ratings

We have not received enough ratings to display an average for the current version of this application.
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