Is the TRX app free?

I've been hearing a lot about the TRX app recently, and I'm quite interested in trying it out. However, before I proceed, I have a crucial question that needs clarification. Is the TRX app free to download and use? I'm always cautious about investing my time and effort into apps that may end up costing me money unexpectedly. It would be great if you could provide me with a clear answer regarding this matter. I'd appreciate it if you could also elaborate on any potential hidden costs or subscriptions that I should be aware of. Thank you for your time and assistance.