Maxaud

This plugin allows you to define different CSS rules that get loaded into the page’s for specific devices.
Includes checks for 18 different tablet options and 13 different phone options.
This can be useful if you need to target specific phones or tablets to make CSS changes or show certain advertisements for certain devices.
For more options or if you feel like donating, check out the <a href="http://codecanyon.net/item/mobile-css-pro/3182318/" title="Mobile CSS Pro" rel="nofollow ugc">PRO version of Mobile CSS</a> that is available for purchase.

Mobile CSS

Allows you to define different CSS styles that get loaded for specific mobile devices.

codepeople

Theme Switch in Mobile and Desktop allows to swap the active theme to another one, when your website is loaded on mobile devices or desktop browsers depending to the screen width. With Theme Switch in Mobile and Desktop plugin, you can select different themes dependent to the screen width, without having to activate the theme previously. “Theme Switch in Mobile and Desktop” will use the correct theme for the conditions where the website was loaded.
Features:
Main features of Theme Switch in Mobile and Desktop are:
<ul>
<li>Allows activate a different theme based in the screen sizes, where website is loaded.</li>
<li>Allows display a dialog where users can select: continue visiting the website with the default theme, or activate a new theme optimized for the screen size.</li>
<li>Allows the apply the themes only for desktop browsers, mobile devices or both.</li>
<li>Allows to disable the theme’s switching with the search engine crawlers.</li>
</ul>
Features included in the premium version of plugin:
<ul>
<li>Allows to switch the themes dynamically without asking first to the users through a popup dialog.</li>
<li>Allows define different themes for different screen sizes. So, if you want activate a theme for bigger screen sizes, like tablets, and another one for a small screen, like mobile phones, this option could be very appreciated.</li>
</ul>
The base plugin, available for free from the WordPress Plugin Directory has all the features you need to define a theme optimized for small screen sizes.
If you want more information about this plugin, please visit <a href="http://wordpress.dwbooster.com" title="CodePeople WordPress Repository" rel="nofollow ugc">http://wordpress.dwbooster.com</a>, where you can also check out other WordPress plugins.
Demo of Premium Version of Plugin
<a href="https://demos.dwbooster.com/mobile-theme-switch/wp-login.php" title="Click to access the administration area demo" rel="nofollow ugc">https://demos.dwbooster.com/mobile-theme-switch/wp-login.php</a>
<a href="https://demos.dwbooster.com/mobile-theme-switch/" title="Click to access the Public Page" rel="nofollow ugc">https://demos.dwbooster.com/mobile-theme-switch/</a>
<h3>Theme Switch in Mobile and Desktop Interface</h3>
Theme Switch in Mobile and Desktop offers several setting options.
<ul>
<li>Apply theme-switch to: Select the device where apply the theme switch (Desktop, Mobile, or both).</li>
<li>Installed Themes: Select the a theme, between all themes installed in your website (active or not).</li>
<li>Screen Sizes: Define the screen sizes used as reference to load the selected theme.</li>
<li>Preview: Button to preview the website with the theme and screen sizes defined.</li>
<li>Accept Theme: Accept the theme and screen combination, to define a new one (only available in the premium version of plugin).</li>
</ul>
In the premium version of plugin it is possible define different themes for different screen sizes. The list of themes and screen sizes can be edited or deleted
<ul>
<li>Load Theme Dynamically: Check the box if you want load the optimized theme dynamically without asking first to the user (only available in the premium version of plugin)</li>
<li>Text to display when theme is not loaded dynamically: Text to display in a popup window asking to the user if activate the optimized theme or continue displaying the website with the active theme by default.</li>
<li>Don’t load the alternative themes with crawlers: Prevents switching the theme with search engine crawlers.</li>
</ul>

Theme Switch in Mobile and Desktop

"Theme Switch in Mobile and Desktop" allows to swap the active theme to another one, when your website is loaded on mobile devices or deskto …

Mobile CSS vs Theme Switch in Mobile and Desktop