Server requirements
Last updated October 8, 2026
Cosmos Client connects to a server with a profile — a link that returns a ready-made configuration. If you set up a server for yourself or for your users, here’s what it needs.
Protocol
Cosmos Client works only with VLESS + Reality.
Configuration
The profile link returns a sing-box configuration in JSON. How the request and response work — in Subscription link.
One country — one configuration
The app shows the profile’s country, not a choice of countries. If your servers are in several countries, make a separate link for each country.