Subscription link
A subscription link is an address from which an app fetches the list of servers and their connection parameters. It contains no program and no interface settings: only entry points with their addresses, ports and keys. Two consequences follow, and they are what people usually ask about. First, the same link works in any compatible app, because it describes the service rather than the client. Second, the list is not frozen — the app re-reads it from that address, so a newly added server shows up for everyone who taps refresh, with no new links issued.
In short
The practical takeaway is simple: the app is a consumable, the link is the constant. If a client does not suit you, install another and paste the same link; nothing has to be re-purchased. Treat it like a password, though: whoever holds it connects as you, so it should not be forwarded into group chats or left visible in screenshots.
Frequently asked
Can one link be used on several devices?
Yes, the link is not tied to a device — it describes a list of servers. Any limit that exists usually applies to simultaneous connections and comes from the plan, not from the link itself. It can go into a phone, a computer and a router alike.
What happens to the link when the app changes?
Nothing. It is not stored inside the app as a setting but lives separately, so moving comes down to pasting it into the new client. One thing worth remembering: turn the old client off before starting the new one, or two active connections will conflict.
Why does the server list sometimes update itself?
Because the app re-reads the link periodically and pulls the current list. That is how newly added entry points reach everyone without issuing new links. If the list looks stale, the subscription entry in the app has a refresh button.