3… 2… 1… Responsive Design Ignition

Create stunning website designs that look fantastic and are easy to use on any device.

No layout or template limitations. No code. Responsive Site Designer is 100% design freedom.

Responsive Site Designer App

Responsive Site Designer

For Windows and OSX

Download Trial

Free. No limitations for 21 days.

Buy for $189 $129

Save $60 during introduction!


  • Features a width slider and custom breakpoints for creating device-agnostic websites.
  • Presents a familiar front-end workflow with custom classes & IDs.
  • Offers the full design capabilities of CSS3, through intuitive visual controls.
  • Uses powerful grid systems and creates incredibly clean, production-ready, code.

Features that make the difference

Allowing you to make design and layout changes wherever needed, breakpoints are truly the secret weapon of responsive design. And with this revolutionary app, they are a cinch to create and manage.


Use the handy viewport slider to inspect your creation at every possible display width. Anytime something doesn’t quite look its best, drop in a mighty breakpoint to optimize the layout or design.


From paper sketches to the production server

Skip static Photoshop or vector design apps. Create directly in the browser with real HTML elements and adaptive grids. Use the full power of CSS3 with intuitive tools.

Design for all devices using easy to manage—custom—media queries. Seeing and feeling the site develop in a production environment (the browser!) is the way of the modern web.

A design workflow you'll love

Specify the default styles for each element. Then use your own classes to create design variations. Change the properties across the site for every element type, class, or ID with a single edit.

What about variations of a variation? The multi-class system has your back, resulting in design creativity and productivity you can’t experience elsewhere.

Custom Classes

Live Design — Clean Code

Working directly in the browser not only creates the unique live design experience, it also allows the code to be semantic and clean. No (confusing) code generation is needed, the CSS3 is written directly to a real stylesheet, resulting in clean and easy to interpret rules.

The inserted HTML elements are standards based. Tags can be switched with two simple clicks to use semantic HTML5 elements like <nav> and <header>, resulting in well marked-up pages and conveying meaning to search engines.

Clean CSS Semantic HTML
Ready for Google
Google Web Fonts

Really responsive images

On a fast connection a significant image payload isn’t a big deal. But on mobile devices or networks, images are often the main bottleneck when it comes to website performance. Being slowed down and paying costly bandwidth fees only to be presented with big images intended for giant monitors, is super annoying.

Luckily all of this is solved by the brand new HTML picture element, implemented in Responsive Site Designer! It’s as simple as changing an image at a breakpoint for a smaller version. For each associated display width, only the specified image will be downloaded, creating a fast and great experience for big and small screens alike.

Responsive Images

Custom layouts that fit any device

Add rows and content containers with just a simple click. Toggle column spans at custom breakpoints to create tailored layouts for smaller screens. Or create tailored tablet, laptop, desktop and everything in between layouts if you design mobile-first.

You can even use subgrids and container nesting for more ultra-precise layout control. Stretch rows, stop floats, change display properties, constrain heights...this app has it all!

Custom Layouts

Integrated Web Inspector

The web inspector has been an indispensable tool for front end developers for years, and we made it available right within Responsive Site Designer. Use the inspector to view or change (drag-n-drop) an element's position in the DOM tree. Or hover the tree to see each element’s outline.

The applied CSS is visible in the lower pane, making it easy to understand what is happening at each breakpoint. Want to edit the code directly? So do we! (So it will probably happen...soon.)

RSD Inspector

Transitions and effects

Use CSS3 properties such as translate, rotate and skew to create powerful visual effects. On any element and without graphics editor.

Transitions smoothen the value changes defined on different states. Grab the attention and impress visitors when hovering images or pressing buttons. Move it, move it, you gotta move it!

Apollo Lander

Exceptional themes and superb designs.

Craft gorgeous site designs in pure HTML & CSS. Create from scratch, build upon existing themes, or replicate and responsify existing websites with ease. The one limitation? The human imagination!

Responsive Themes

More cool features

Configurable Elements

Configurable element properties

Drag and Drop

Over 20 elements ready to be dragged (and dropped)


States for interactive elements

Font Icons

Over 1200 great font icons included

Project Management

Project Management

HTML Import

HTML Import

Andrew Moss

It is pretty amazing how easy it makes the whole responsive website creation process.

Andrew Moss on the Forums
Matteo Lovatti

Responsive Site Designer is nothing less than a work of genius! A true revolution in website design.

Matteo Lovatti on Twitter
Angel Velazquez

RSD is such a time saver. Easily read all my svg files, queries easily manageable and more importantly affordable. Made my new portfolio with it.

Angel Velazquez from AEVolucion.com on Facebook
Heather Carter

I absolutely LOVE the new Responsive Site Designer, even for the computer code challenged it works!

Heather Carter

Do it right — Use RSD


Create & Design


Drag-n-drop content elements like headers, images, buttons, icons and more

Up to 21 (+ 33 variations)

Organize images and other assets in the Project Resource Library

Smooth and familiar front-end design workflow using custom selectors

Target types, (multiple) classes or IDs

Design for interaction with hover, active and pressed state controls

Create powerful 3D effects that will make the site come alive…

Add special widgets or custom scripts with the HTML Element

Plethora of typographical design functions, including Google Font integration

Font Family, Size, Weight, Color, Style, Line-height, Text Align, Transform, Decoration, Wrapping, Spacing (indent, Letter, Word), Text Shadow, Superscript, Subscript

Write, paste, or edit text in place with an intuitive, powerful, text editor

All the design power CSS3 has to offer without writing a single line of code

Padding, Margin, Floats, Display, Position, Overflow, Border (radius), Background (image), Width (min, max), Height (min, max), Scale, Translate, Rotate, Skew, Opacity, Box Shadow, Transitions and a few more…

Integrated web inspector with spacing outliner, DOM tree and live CSS preview

Unlimited website projects with up to 50 (for now) pages each

Responsive Tools & Elements

Full range viewport slider — view and work on the design at any possible width right in the app.

Adapt the layout or tweak the design at any display width using custom breakpoints

Responsive images: use the new HTML picture element to show different images at different widths

Focus the viewer's attention on a specific area of the image with the focal point function

Mobile-first and desktop down workflows with corresponding media queries

Adaptable Layout Creation & Management

Fluid grid systems with configurable columns, gutter and widths.

Choose pixels or…ems!

Rows can be constrained to certain widths or full-width for appealing visual (background) effects

Sublime column management: span, offset, push and pull with simple drop downs

And change these at any breakpoint for an optimal viewing experience on any device!

Subgrids and container elements give unique granular control over the layout at any width

Fix rows or place elements outside of the flow with comprehensive positioning controls

Finishing Touches

Use the tag switcher to create the most semantic HTML

Yup, turn that <div> into a <nav>

Add meta data and other head (or footer) code for SEO or plugins

Publish directly to the CoffeeCup servers and share the link for feedback and collaboration

Export clean, semantic, HTML & CSS that can be uploaded to any server

(Includes any added plugins)

Traditional CoffeeCup Perks

Free support from the fastest support staff on the web

Plethora of upgrades, free in between major version increases

Cool release special, buy now and save $60 plus get free themes

Limited time offer!

Need multiple licenses? We have special prices for design agencies and other business that require more than 3 licenses. Just contact us here and we’ll get you set up in snap.