Demo Site
Is there a demo site available where you can see all the customizations available? Also, what's required to get an app in the Play and Apple Store?
You can visit the official website. All the visuals are available there. There’s also a demo video that shows you how FC Pulse works. https://fcpulse.pro/en/
To publish on Apple and Google, you need to open your developer accounts ($99/year for Apple and a one-time $25 fee for Google, either as an individual or a company) and offer a true native mobile experience that complies with store guidelines which is exactly what FC Pulse does.