iSeller offers Free Trial, but Shopify Plus does not.
iSeller is designed for Medium Business and Small Business.
Shopify Plus is designed for and Large Enterprises.
Pricing details for both iSeller and Shopify Plus are unavailable at this time. Contact the respective providers for more information.
Some top alternatives to iSeller includes Exlcart, WooCommerce, Shopify Plus, BigCommerce, Shopify, AmeriCommerce, 1ShoppingCart, Elliot, Oneshop, Ecwid, Web.com and ICRM Software.
Some top alternatives to Shopify Plus includes Sharetribe, WooCommerce, BigCommerce, Square Ecommerce, Shopify, AmeriCommerce, Ecwid, Salesforce B2C Commerce, Magento Open Source, NetSuite SuiteCommerce, WebCommander and Web.com.