Is Blur app free?

I'm curious to know if the Blur app is available free of charge. Given the increasing popularity of privacy-focused applications in the cryptocurrency and finance sector, I'm particularly interested in the pricing model of this specific tool. Could you please clarify if Blur is a freemium service with optional paid features or a fully-fledged free application? Furthermore, if there are any costs associated with using the app, could you elaborate on the pricing structure and any potential benefits of upgrading to a paid version? Your insight into this matter would be greatly appreciated.