HubSpot is at the core of what we do, but we also use other tools
We recommend and use HubSpot as the core CRM platform for all of our clients. But, we also work with other tools as appropriate—for example, Google Analytics, Buzzsumo, Buzzstream, Moz and so on.
If you have other platforms that you base your sales and marketing work on, talk to us about it. It doesn't automatically prevent us from working together; however, it may limit what we can do for you.
Take a look at this article for more information: Do you have to have HubSpot to work with us?