Let's start with the concept of what CRM is , a customer relationship management system from this and an abbreviation from English. CRM is an interaction model based on the theory that the center of the entire business philosophy is the client, and the main areas of the company's activities are measures to ensure effective marketing, sales and customer service. 

The concept of CRM for most advanced users is online company management via the Internet. Moreover, narrowly targeted systems for specific types of activities have appeared. There are a lot of offers on the market, but how to choose the right one? Sometimes there is nothing you need, moreover, if desired, such a system can be made strictly for you, of course, if you can afford it financially.

There are simply no free CRM systems, there is some testing period, which is usually two weeks. Or important options are only for a fee. By the way, not every system has a mobile application that can be installed on a phone. Which is a very important point, you do not always have a computer or laptop at hand. 

Integration with different services, recording of conversations with clients. Backup, in case of failures, as everyone says in our cloud, nothing will happen. I advise you to carefully read the user agreement before purchasing any CRM. 

Which one would I choose? For many companies, Google Workspace will do , the price per user per year is $70. By the way, most CRMs are implemented in Google services, you understand that because of convenience.