What is Gemini? Gemini is a new internet protocol which is different from the HTTP and Gopher. It's much cleaner and has a growing community and audience of hackers. Why use gemini protocol? Gemini capsules (webpages of gemini) are lightweight, minimal, and don't use many resources to operate. It can run along with your websites. Gemini capsules use port 1965 by default. Your webserver can run at port 80 or 443 along with gemini server at port 1965.