Placker offers 15 days of testing so you can see how it works and make a decision, but access to Placker features is not included in the Trello Premium (also known as Gold or Business Class) accounts, the power-up is simply an integration between Trello and Placker.
The same logic applies to other power-ups, like Salesforce, Pipedrive, Intercom, etc., that is, having a paid Trello account won’t give you free access to these premium services.
Trello currently offers a free plan, which also works with Placker.
If the trial period is not enough or if you need more time to make a decision, we will be glad to increase your trial.