PROJECT V ECOSYSTEM
The Project V ecosystem
How clients and cores fit together
Understand the interface, core, and protocol before comparing features. Similar client names don't mean configurations are interchangeable; choose based on the protocols, transport methods, and operating environment you actually use.
From Project V to GUI clients
Project V organizes inbound traffic, routing, and outbounds as separate components. The V2Ray core accepts local traffic, applies rules, and connects to remote servers. GUI clients make configuration editing, subscription management, logs, and system integration accessible through an interface. So v2rayN and v2rayNG are more than protocol names: they're management tools built around a core.
Troubleshooting also means separating these two layers: an interface that opens normally doesn't prove the core has started, and a running core doesn't prove the target app is sending it traffic. Check the logs for startup errors, then check proxy routing and the active configuration. That's often more useful than repeatedly switching protocols. The site's glossary explains these concepts and is useful when you encounter unfamiliar fields.
V2Fly and Xray compatibility
V2Fly and Xray share historical roots and some protocols and configuration concepts, but they're maintained independently. Protocol support, transport options, DNS behavior, and newer fields may differ. JSON syntax alone doesn't make a native configuration portable between cores; GUI clients may also have limits on how they convert imported parameters.
VMess, VLESS, Trojan, and Shadowsocks are protocol choices; TLS, REALITY, and specific transport methods belong to other layers. REALITY isn't a standalone proxy protocol that can be swapped in for VMess; it typically works with a compatible protocol and core. Match the client's capabilities to the configuration provided by the server, rather than choosing based only on which name sounds newer.
Open-source status of the three clients
v2rayN, v2rayNG, and v2flyNG are all open-source GUI clients, with source code and licenses forming the basis for collaboration and use. v2rayN is designed for desktop use, with a focus on configuration management and system integration. On Android, v2rayNG works with the Xray core and system VPN interface, while v2flyNG provides another option for users who want the V2Fly core.
Open source doesn't mean the three clients have identical features, or that one can read all of another's local data. When migrating, use share links or subscription formats supported by both, then recheck routing, DNS, per-app proxy settings, and background permissions. For redistribution or modification, read the licenses for each client and its bundled components; the entire ecosystem doesn't use a single license.
Check three types of changes separately when updating
The client interface, core, and rule data can change independently. An interface update may move menus or change import behavior; a core update may add protocol support or alter configuration requirements; changes to geosite or geoip data may affect which traffic a rule matches. If behavior changes after an update, identify which layer changed before editing the configuration.
Before updating, keep the local configurations and custom rules you need, and read release notes for system requirements and compatibility. Updating a subscription only refreshes content from its source; it doesn't update the client or core. Maintain stable configurations deliberately rather than updating the client, core, subscription, and routing all at once and then trying to track down the cause. For a more detailed comparison, see the protocol and core reference.