Can i still use custom power up in free plan?

Can I still use my custom power up and my published powerup in free plan?

Hi @sana - just gave it a whirl in my personal Trello free account – installing my custom app to a board, and it appears as if you’re only allowed a single Power-Up per board on the free plan.

Thank you for your reply! Will I still be able to use power up admin page after downgrading to free plan? And my published powerup will still be active?