The client provides the interface and manages settings; the core handles connections. Understanding the difference helps you identify which component provides a feature and what to check when updating.
Project V and the origins of V2Ray
Project V is an open-source ecosystem built around proxy communication tools, with V2Ray as one of its best-known core projects. Its modular configuration combines inbound and outbound traffic, transport, and routing, allowing one GUI to manage different connection types. People often use “V2Ray client” to refer to both the graphical app and the underlying core, but they are separate software layers. The download page lists clients, while the protocol guide explains the protocols and cores behind them.
This layered design explains why two clients can import similar share links but have different menus and operating modes. The client determines the interface; whether connection fields are recognized depends on the core and importer implementation. Check the client name when looking for settings, and identify its core when checking protocol support. Don't assume instructions or screenshots for one platform apply to another app.
How V2Fly and Xray diverged
V2Fly continues community maintenance of the V2Ray core, while Xray developed along a separate core path from related code. They share concepts and configuration conventions, but ongoing development means not every new field or security-layer option is recognized by both. A client supporting VMess or VLESS doesn't necessarily support every transport combination for those protocols. Choose based on the complete configuration provided by the server, rather than the core name alone or assuming one option is best for every use case.
On mobile devices, resource use also depends on transport, connection count, network changes, and background policies. Protocol names alone don't provide a reliable battery-life ranking. If your current configuration meets your needs, keep it stable. When adding a feature, check core support, client import capabilities, and server requirements. This is easier to maintain than repeatedly switching clients.
What each of the three clients does
v2rayN, v2rayNG, and v2flyNG are open-source GUI clients designed to simplify configuration and everyday use. v2rayN is for desktop, with controls for subscription groups, system proxy, and routing. v2rayNG is for Android and uses the system VPN interface to handle app traffic. v2flyNG offers an Android option built on the V2Fly core. Similar-looking interfaces don't make every setting equivalent, so check each option before switching.
A client is not a connection service, and installing one doesn't provide a usable subscription. The subscription source supplies connection settings; the client imports and runs them. Keep these separate when troubleshooting so you can tell whether the problem is installation, import, server availability, or local routing. This site focuses on these three clients and treats subscription sources and software releases as separate topics.
Open-source licenses and update boundaries
The V2Ray and Xray cores are licensed under MPL 2.0. GUI clients have their own license notices and dependency details. Open-source licenses set the terms for using, modifying, and redistributing code; they don't mean every software layer has identical licensing requirements. For ordinary use, check the features and release notes. If you plan to modify or redistribute software, review the actual license for the client, core, and relevant dependencies separately.
Updates affect different layers: a client update may change the interface or import behavior, a core update may add support for protocol fields, a subscription update refreshes connection profiles, and a rules resource update changes category matching. A successful subscription update doesn't mean core capabilities have changed. Keep any local settings you need before upgrading. Afterward, test existing connections and commonly used apps before enabling new options; changing fewer variables at once makes troubleshooting easier.