Why Do Companies Choose CRM System? CRM system is a must-have for all types of businesses. It captures details of transactions and stores the results of interaction with customers: how they are progressing through the sales, what they are satisfied with and what they complain about. It helps to analyze the work of departments and increase their efficiency. On the market there are many off-the-shelf solutions: amoCRM, Bitrix 24, A2B, Microsoft Dynamics CRM. But there are companies that prefer to build their own CRM system.