We've been using Litmus for our mailchimp emails for a long time. It costs a lot of money per year to do 1000 inbox previews per month. We're now switching to HubSpot, and we noticed the Content and Marketing Hub plans in HubSpot have the inbox preview tool, which is actually just Litmus.
I've found little information on how this tool is managed. When you click the "Powered by Litmus" image in the inbox preview, you're taken to this page which says we get to try Litmus for free for 7 days. We've had our HubSpot account longer than 7 days so that information is wrong.
I can't find anything in our HubSpot account settings that shows how many inbox previews we've generated this month, and how many we have left. Do I just have an unlimited amount of inbox previews per month? Given how expensive Litmus is, I am assuming that's not the case.
I'm not aware of any limits regarding the client preview feature. There isn't any mention of a limit, neither in the documentation nor the product catalog: