PROJECT V / V2FLY / XRAY
Open-source clients and core ecosystem
“V2Ray” is often used as an umbrella term for a group of clients and protocols, but the interface, core, protocol, and server service are separate things. Understanding the distinction helps you identify which component to update, which configuration to check, and which problems cannot be solved by switching clients.
Project V: the roots of the configuration model
Project V is a modular proxy toolkit, and V2Ray is one of its widely used implementations. Inbound, outbound, and routing form the basic framework for understanding its configuration: inbound accepts requests from local apps, outbound determines how to connect to a destination, and routing chooses the path between them. GUI clients organize these settings into menus, lists, and switches, so everyday setup doesn’t have to start with a full configuration file.
This is why a successful subscription import and a working webpage are separate checkpoints. A subscription supplies connection parameters, but you still need to verify that the app uses the local entry point, the core starts, and the remote server is reachable. The setup guides cover these checks in order rather than treating every issue as a problem with the same connect button.
V2Fly and Xray: related, but different
The V2Fly community continues V2Ray’s development and maintenance. Xray originated in the related codebase and has developed its own protocol and transport capabilities. The two share many basic concepts, but configuration details and support for new features can differ. Even when a protocol name looks familiar, check the specific transport, security settings, and core support. A file extension alone does not tell you whether a configuration is compatible.
For example, REALITY involves a security mechanism related to the TLS handshake; it is not a protocol name you can swap in arbitrarily. The client core must support it, and its settings must match the parameters provided by the server. If a handshake fails, check the address, port, server name, and authentication parameters rather than just changing the display name in the interface.
Three clients: interfaces and open-source licenses
v2rayN is for desktop systems and manages everyday tasks such as server lists, subscription groups, and proxy modes. v2rayNG is for Android and provides mobile GUI configuration with the Xray core. v2flyNG is an Android option for the V2Fly core ecosystem. All three clients are open source. Refer to each project’s included files for its license, third-party components, and redistribution requirements.
Open source describes how code and licensing are made available; it does not mean every configuration is suitable for your device or remove the need to assess your subscription source. Subscription URLs may contain access credentials, so hide URLs, account identifiers, and authentication parameters before sharing screenshots or logs. Similar client names also do not mean their local backup files can be safely overwritten interchangeably.
Updates and maintenance: back up, then verify
The interface, proxy core, and rule data may update independently. Interface updates can change where options are found, core updates may affect protocol handling, and rule data updates can change domain and IP classifications. Save your subscription details and custom local rules before updating, and read the release notes. Afterward, test a known-working configuration before restoring complex routing; this makes it easier to identify which layer caused a change.
This site organizes download links and setup guides. It is not affiliated with the upstream development teams and does not provide nodes or subscription services. Settings shown in the guides explain the general workflow; actual menus may change. When a connection fails, note what triggered the issue and check the relevant logs. Then troubleshoot the local entry point, core startup, and remote server settings—in that order. This is usually more effective than resetting everything at once.