Yes, Transfer works on all Zapier plans including those on a free trial. :)

App rate limits and your plan’s Task limits would still apply. Also, it’s worth noting that each record you send uses 1 Task. So if you’re planning to use Transfer to do a one-off bulk import of data between apps it may be worth temporarily upgrading to a higher plan.

You can find out more about these limits here: Bulk import data into apps with Transfer > Send Data

Hope that helps!