Looking for a specific CRM. Help!

Hi everyone,

I would like to know what CMR is fully customizable (so I can be able to use the logo of my company in it), that lets me create subaccounts, you know like, allows creating a sub-account for each of my clients so I can manage all the information from one platform in but I separate them into subaccounts (I hope this makes sense) and that also uses a subdomain of my website to be able to access it (an example of that would be CRM.yourwebsite.com).

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Does any of you know what CRM they use that allows them to do that?