Project V: A quick look at the ecosystem
Project V is an open-source ecosystem of proxy tools, with V2Ray among its best-known projects. In everyday searches, “V2Ray” may refer to a core, a compatible configuration, or the overall setup, so the term alone doesn't tell you which installer to download. A GUI client turns lower-level settings into menus, groups, and toggles, so you don't have to write a complete configuration by hand each time. Protocols, transport settings, and authentication details still need to match the remote service.
This site covers installation and connection as separate steps: choose a GUI client for your device, learn what a subscription provides, and then see how the system proxy and routing affect app traffic. This approach helps pinpoint which part is causing a problem and avoids mistaking an open client for a connection that routes all network requests as expected.
V2Fly and Xray: Related, but not interchangeable
The V2Fly community continues V2Ray's maintenance and development. Xray grew from related code and continues to evolve its own features. They share some technical roots, but differ in protocol extensions, configuration fields, and release schedules. VMess, VLESS, and Trojan are distinct protocol types; REALITY is a specific connection security mechanism. These names aren't interchangeable options.
When choosing a configuration, first check the required protocol, transport, and core support, then verify fields such as the TLS server name. A feature supported by one core may not work with another. Defaults in older guides may not suit current builds. If you encounter an unfamiliar parameter, keep the original configuration and consult the relevant documentation rather than rewriting it based on a similar-sounding name.
Three open-source clients, each with a different focus
v2rayN is a desktop client with GUI tools for server management, subscription groups, system proxy settings, and routing. Cross-platform builds and the classic interface may place options differently, but the workflow is the same: import a configuration, then check the core and proxy scope. On desktop, pay close attention to the local listening port and the system proxy state after closing the client. If you change the port, update any apps that use it too.
v2rayNG is an Android client that uses the Xray core. Common import options include the clipboard, QR codes, and subscription group settings. It routes traffic through Android's system VPN interface, so permission prompts, per-app proxy settings, and background activity settings can all affect results. A QR code is just one way to carry configuration data: scanning it doesn't guarantee the remote configuration is valid or that a subscription has been updated.
v2flyNG is an alternative Android client that uses the V2Fly core, for setups requiring its specific behavior or configuration compatibility. Choose it to meet your configuration requirements, not as a way to troubleshoot by running multiple clients at once. Android typically allows only one active VPN service at a time. Stop the existing connection before switching clients, then verify the imported settings and proxy scope in the new client.
Open-source licenses: Know what the code and licenses cover
All three clients are open-source projects. v2rayN is licensed under GPL-3.0; v2rayNG and v2flyNG use GPL-3.0 family licenses. The V2Fly and Xray cores use MPL-2.0. For details on use, modification, and redistribution, follow the license files and dependency notices included with the build you're using. A client, its core, and bundled components may have different licenses.
Open-source code can be read and discussed, but that doesn't mean every remote service is trustworthy. Subscription URLs may contain credentials, and logs can reveal server details. When asking for help, include only the error context needed and redact credentials, subscription URLs, and personal information. A client's open-source status and its service provider's business practices are separate matters; assess them separately.
Updates: Back up first, then check what changed
Clients, cores, routing resources, and subscription content each have their own update sources and schedules. Updating a subscription refreshes remote configuration; it doesn't update the client. Updating the client doesn't guarantee that the subscription URL still works. If a connection issue appears, identify which layer changed recently before updating anything. Before upgrading, record the current proxy mode, routing choice, and custom ports, and back up your settings. Avoid combining an upgrade with a large set of configuration changes.
Community maintenance brings feature changes and fixes, but can also change menu names or default behavior. That's why this guide focuses on what each setting does rather than requiring buttons to stay in one place. After an update, check that the client starts, then test everyday apps and destinations that should connect directly. Once the new setup is stable, remove old backups. If problems persist, use the logs to investigate configuration parsing, DNS, connection setup, and TLS errors separately.