Is Kraken Pro free?

Excuse me, could you please clarify for me if Kraken Pro is a free service? I've heard of Kraken as a cryptocurrency exchange, but I'm not sure if their Pro version comes with any costs associated with it. As someone who's looking to get into cryptocurrency trading, I'm always on the lookout for reliable and cost-effective platforms. Could you elaborate on the pricing structure of Kraken Pro, and if there are any hidden fees that I should be aware of? Your insights would be greatly appreciated.