Kast provides a party link sharing to invite friends into parties.
Picture 1. Party view.
To invite friends into the party use the "Invite Friends" button at the top left to open the invite modal (see Picture 2).
Picture 2. Invite window.
After selection you have two options to invite your friend.
1. Use the search bar to find any Kast user and select "Invite"
2. Copy the share link at the bottom and paste the link to the direct messaging or social media service of your choice.