Recommend a good paid app for customer reference

We do SaaS CRM, now the system is running in beta mode. Can give access.

CRM on Wikipedia. — down below there are links to vendors of crm.
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In General, I was looking pretty hard. But soon I found normal. A lot of software, a lot of different possibilities, and the fact that you had me I never found.
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Now I use Excel for the database (sorting, formulas, symbols) and organizer for the planning and calls.

MS CRM?

1C crm