Places a highly visible marker in the upper corner of every post/page to denote a development site.

Erez Hadas-Sonnenschein

Smartarget Corner Ribbon

Promote special offers with corner ribbon

alewin77

Bounce Grab – Corner Peel Exit Pop

Bounce Grab is an easy to use Wordpress plugin that shows a corner peel advertisement when a user tries to exit your page.

lucianohpcv

Page Cornr

noeprivacy

Corner Blog Decoration

This plugin will create an decoration on your blog at the corner of user browser.

philipacamaniac

Sometimes you’re developing a theme or a site, and it looks similar to (or exactly like) the production version of that site. Installing this plugin will make it instantly easy to see that you’re looking at your development site.
NEW! Adjust the position and behavior of the badge, and add optional link and custom text.
<ul>
<li>Positions: Stick the badge on the left or the right corner.</li>
<li>Behaviors: Absolute (stick to the top of the page) or Fixed (stick to the top of the browser window).</li>
<li>Optional Link URL: The badge can link back to the production version of a site or anywhere else.</li>
<li>Optional Custom Text: The default badge reads “Development Version” but you can now use your own custom text (15 character max).</li>
</ul>

Alternatives to Dev Corner Badge

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