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This plugin is restricts the number of products that can be added to the cart to just one. This means that if a customer adds a new product to the cart, any existing product will be removed automatically, ensuring that only one product remains in the cart.
<h4>How does One-Item-Allow-Cart work?</h4>
One-Item-Allow-Cart hooks into WooCommerce’s cart handling process and restricts the number of products allowed in the cart to just one. Whenever a new product is added to the cart, any existing product is removed automatically.

One-Item-Allow-Cart

This plugin is restricts the number of products that can be added to the cart to just one. This means that if a customer adds a new product to the car …

Yordan Soares

alexmigf

Ewout

Jeremiah

kluver

Darren Peyou

** Works with WooCommerce and Easy Digital Downloads (EDD) **
This plugin installs a shopping cart button in the navigation bar. The plugin takes less than a minute to setup, 
and includes the following options:
<ul>
<li>Display cart icon, or only items/prices.</li>
<li>Display items only, price only, or both.</li>
<li>Display always, or only when there are items in the cart.</li>
<li>Float left, float right, or use your menu’s default settings.</li>
<li>Customize your own CSS</li>
</ul>
Pro Version Includes:
<ul>
<li>A choice of over 10 cart icons</li>
<li>A fully featured cart details flyout</li>
<li>Ability to add cart + flyout for unlimited menus</li>
<li>Ability to add a custom css class</li>
<li>Automatic updates on any great new features</li>
<li>Shortcode to display cart anywhere on your site</li>
<li>Quick and thorough support</li>
</ul>
Download the Pro version here – https://wpovernight.com/downloads/menu-cart-pro/
Finally, the cart automatically conforms to your site’s styles, leaving you with no extra work.
Compatibility:
<ul>
<li>WooCommerce</li>
<li>Easy Digital Downloads</li>
<li>Easy Digital Downloads Pro</li>
</ul>
Translations:
<ul>
<li>Brazilian Portuguese</li>
<li>Danish</li>
<li>Dutch</li>
<li>Croatian</li>
<li>Czech</li>
<li>English</li>
<li>French</li>
<li>German</li>
<li>Greek</li>
<li>Hebrew</li>
<li>Hungarian</li>
<li>Italian</li>
<li>Norwegian</li>
<li>Persian</li>
<li>Polish</li>
<li>Portuguese</li>
<li>Russian</li>
<li>Spanish[1]</li>
<li>Swedish</li>
<li>Turkish</li>
<li>Vietnamese</li>
</ul>
[1] WebHostingHub

Menu Cart for WooCommerce

Excellent!!!!

Works well with Onepress theme. Thank you.

Works well

Automatically displays a shopping cart in your menu bar. Works with WooCommerce and Easy Digital Downloads (EDD)

One-Item-Allow-Cart vs Menu Cart for WooCommerce