makenmarketing

This plugin allows you to designate certain products in your WooCommerce store to have no price. Instead, it displays a configurable button for customers to request a quote directly via a chat app (like WhatsApp).
From the settings page, you can customize: 
* The WhatsApp phone number. 
* The button text and icon. 
* The predefined message the customer will send. 
* The button colors.

Quote via Chat Button

Replaces the "Add to Cart" button with a chat button for products without a price, with customization options.

Websorcery

This plugin automatically hides the “Add to Cart” button for WooCommerce products that have no price set (or empty price). Instead, it displays a customizable “Request Price” button that opens a lead capture modal.
Features: 
* Automatic detection of checking empty prices. 
* Lead capture form (Name, Phone). 
* Email notifications. 
* Customizable design via settings. 
* GDPR compliant checkbox. 
* Localization support (i18n).

Websorcery Request Price

Replaces "Add to Cart" with "Request Price" button for lead generation.

Quote via Chat Button vs Websorcery Request Price