Mryntu

I need to set limit to the compared product, for example: max_limit 4, But now it is adding Number of products to compare list.
Kindly suggest.

We can try with Plugin. We use MagentoCatalogHelperProductCompare to get the current compared products.

app/code/Company/Catalog/etc/frontend/di.xml

<?xml version="1.0"?>

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">

 <type name="MagentoCatalogControllerProductCompareAdd">
 <plugin name="LimitToCompareProducts"
 type="CompanyCatalogModelPluginCompareLimitToCompareProducts"/>
 </type>
</config>

app/code/Company/Catalog/Model/Plugin/Compare/LimitToCompareProducts.php

<?php

namespace CompanyCatalogModelPluginCompare;

use MagentoFrameworkControllerResultRedirectFactory;
use MagentoFrameworkMessageManagerInterface;
use MagentoCatalogHelperProductCompare;

class LimitToCompareProducts

 const LIMIT_TO_COMPARE_PRODUCTS = 3;

 /**
 * @var MagentoFrameworkMessageManagerInterface
 */
 protected $messageManager;

 /**
 * @var RedirectFactory
 */
 protected $resultRedirectFactory;

 /** @var Compare */
 protected $helper;

 /**
 * RestrictCustomerEmail constructor.
 * @param Compare $helper
 * @param RedirectFactory $redirectFactory
 * @param ManagerInterface $messageManager
 */
 public function __construct(
 RedirectFactory $redirectFactory,
 Compare $helper,
 ManagerInterface $messageManager
 )
 
 $this->helper = $helper;
 $this->resultRedirectFactory = $redirectFactory;
 $this->messageManager = $messageManager;
 

 public function aroundExecute(
 MagentoCatalogControllerProductCompareAdd $subject,
 Closure $proceed
 )

 $count = $this->helper->getItemCount();
 if($count > self::LIMIT_TO_COMPARE_PRODUCTS) 
 $this->messageManager->addErrorMessage(
 'You can add the compared products under 3 item(s)'
 );

 /** @var MagentoFrameworkControllerResultRedirect $resultRedirect */
 $resultRedirect = $this->resultRedirectFactory->create();
 return $resultRedirect->setRefererOrBaseUrl();
 

 return $proceed();
 

@ankit

What about Admin -> Stores -> Configuration -> Catalog -> Catalog -> Recently Viewed/Compared Products -> Default Recently Compared Products Count?

This does not limit the quantity of items on your compare.