@Stela Mazoli Jaouiche the providers of power ups might charge for them, independently of whether or not they are allowed on your board as part of the free Trello plan.
Most power ups are not provided by Trello, but are provided by 3rd parties as integrations with their products, so you don't pay for the power up but you pay for that product. Some power ups are provided by 3rd parties as extensions to Trello, so in that case you just pay the provider of that power up for access to that power up.
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