Project V and the V2Ray Background
Project V brought together composable proxy tools, and V2Ray organized capabilities such as inbounds, outbounds, routing, and transports into a configuration model. Most users don't need to start by learning the full configuration format: graphical clients turn common tasks into settings you can select and edit. This background helps clarify that downloading a client and choosing a protocol are separate decisions. One interface can manage multiple protocols, and a given protocol may be implemented by different cores.
This page uses V2Ray as the entry point to the ecosystem; the clients covered are v2rayN, v2rayNG, and v2flyNG. Each has its own maintenance schedule and intended use, so similar names don't guarantee identical features. Menus in a tutorial may also change as the interface is updated. If a label looks different, find the equivalent setting and check that it serves the same purpose.
What V2Fly and Xray Share—and Where They Differ
The V2Fly community maintains the development of the V2Ray core, while Xray evolved as a fork based on related code. They share concepts such as inbounds, outbounds, and rule-based routing, but their added features aren't identical. When using VLESS, REALITY, or specific transport combinations, check support in the actual core. REALITY is a security-related transport mechanism; it should not be treated as a complete proxy protocol that can be swapped one-for-one with VMess.
Choose a core based on the requirements of your configuration and whether the client can represent its fields correctly. If a configuration works with one core but fails with another, compare protocol parameters, transport options, DNS, and routing behavior before blaming the client in general. Different defaults can also change how connections behave, so keep the original settings available as a fallback when migrating.
Open-Source Licenses for the Three Clients
v2rayN, v2rayNG, and v2flyNG are all open-source clients. Their interfaces and configuration management can be examined to understand how features work with the core. v2rayN and v2rayNG use the GPL-3.0 license; check the license included with the relevant v2flyNG release. The main V2Ray and Xray cores use MPL-2.0. Licenses may differ between a client, its core, and included components, so review each one's terms before modifying or redistributing it.
For everyday use, open source makes it easier to understand how software works and investigate problems, but device permissions, configuration sources, and system environments still need separate consideration. Before importing an external configuration, check for DNS, routing, or listening settings you don't need. When sharing logs, include only what is necessary for troubleshooting and hide subscription URLs, credentials, and information that could identify your device.
Treat Client and Core Updates Separately
Interface updates may improve subscription parsing, installation, or system compatibility; core updates can change protocol support and runtime behavior. A client update doesn't necessarily mean every core feature has changed. Likewise, if a configuration requires a new capability, the client looking the same isn't enough to confirm support. The download page collects installer links, while the homepage avoids fixed release numbers so static information isn't mistaken for a live release feed.
Before updating, export any configuration you need to keep and note the current operating mode, subscription groups, and custom rules. Afterward, check in this order: can the app start, read subscriptions, connect, and route traffic as expected? If only one type of access is affected, check the relevant rules and resolution path first. Testing changes separately helps distinguish interface issues from server-side or local network changes.
Evaluate Protocol Performance in Context
VMess and VLESS make different design tradeoffs, but neither protocol name guarantees higher throughput or lower power use. Real-world performance also depends on server load, transport overhead, network latency, encryption implementation, and device conditions. Mobile use adds background restrictions and network changes to the mix. Start by ensuring compatibility with your configuration, then compare under similar network, destination, and timing conditions. A single latency test doesn't characterize an entire route.
If you're new, choose the right client on the download page, then follow the guide to import a subscription and verify the connection. For protocol migrations or routing changes, continue with the protocol guide. If you can connect but access is unreliable, first determine whether all requests fail, only specific domains fail, or the connection drops when the screen locks. Then see Frequently Asked Questions for the right checks. Pinpointing the scope of a problem is usually more useful than repeatedly reinstalling.