YES!
xDrip4iOS (also known as “xDrip for iOS” or “xdripswift”) is an open-source application to display real time blood glucose data. Information on XDrip can be found HERE.
It can be configured as a FOLLOWER or an UPLOADER.
To run xDrip4iOS you will firstly need an iPhone 7 or newer running minimum iOS13.
To work as a Master device, you will need to have a compatible CGM system.
If you want to share your CGM data with Nightscout, then you will also need a working internet connection.
To work as a Follower device, you don’t need anything except an internet connection and a working Nightscout site from where to follow the master device.
Information on xDrip4IOS setup is provided by our Knowledge Base.