Free plan or free trial?
Two different ways to test a service.
A free trial is time-limited
It lets you evaluate a service for a set period. It may automatically become a paid subscription, depending on the terms you accept.
A free plan may be ongoing
It usually has limits such as fewer features, lower usage or fewer connected accounts. Check whether the feature you need is actually available.
A money-back guarantee is different
You may be charged first and have to request a refund under specified conditions. Do not assume it is the same as a no-charge trial.