peterwolfpl

Peterwolf Corner Ribbon displays an elegant diagonal ribbon in the upper-left or upper-right corner of the public website. It is designed for labels such as Preview, New, Sale, Archived, or any custom notice that needs to remain visible above the theme layout.
The plugin does not require editing templates or blocks. Activate it, open Appearance > Corner Ribbon, and configure the ribbon from a single settings page.
Source code: https://github.com/peterwolf-pl/Peterwolf-Corner-Ribbon
Features:
<ul>
<li>Custom single-line or multi-line text.</li>
<li>Left or right upper-corner placement.</li>
<li>Configurable ribbon background and text colors.</li>
<li>Optional drop shadow with selectable color.</li>
<li>Width, thickness, top offset, and layer-order controls.</li>
<li>Font family, font size, line height, font weight, letter spacing, and uppercase options.</li>
<li>Sanitized settings stored through the WordPress Settings API.</li>
<li>Lightweight frontend output: one stylesheet and one HTML element when enabled.</li>
</ul>

Peterwolf Corner Ribbon

Add a customizable diagonal corner ribbon overlay to any WordPress website layout.

Erez Hadas-Sonnenschein

Corner Ribbon – Promote special offers with Corner Ribbon 
Do you have special deals sometimes? Like Black Friday? Weekend special? Holidays? 
The Corner Ribbon will be shown to users on all pages, both on desktop and mobile. It allows you to communicate with them about your promotion. 
Smartarget Corner Ribbon plugin works also with WooCommerce, Elementor and Oxygen Builder.
<h3>Smartarget Corner Ribbon Pro Features:</h3>
Pro version overcomes your limitations with lite version of Smartarget Corner Ribbon.
<blockquote>
Smartarget Corner Ribbon <a href="https://smartarget.online/page_pricing.html" rel="nofollow ugc">PRO</a> Plugin Features
<ul>
<li>Apps visibility on all pages</li>
<li>No Smartarget label</li>
</ul>
</blockquote>
BUY Smartarget Corner Ribbon Pro Features : <a href="https://smartarget.online/page_pricing.html" rel="nofollow ugc">Buy Now</a>

Smartarget Corner Ribbon

Promote special offers with corner ribbon

Peterwolf Corner Ribbon vs Smartarget Corner Ribbon