How Project V and V2Fly are related
Project V offers modular tools for proxy communications, with V2Ray as one of its widely used core projects. The V2Fly community continues to maintain V2Ray-related implementations and documentation, so you may see Project V, V2Ray, and V2Fly in client guides, configuration references, and error logs. These aren’t three interchangeable download options. When reading the documentation, first check whether it’s discussing project background, a core implementation, or a specific graphical interface.
Graphical clients organize common settings into menus and forms; the core interprets the configuration and handles connections. Changes to entries in the server list typically affect the runtime configuration generated by the client. Core-related settings may affect protocol support, DNS resolution, or routing behavior. Understanding this distinction helps you decide whether to check a UI action or connection parameters when an error occurs.
Xray vs. V2Fly cores
Xray is an independent core project that grew out of the V2Ray technology lineage. It shares historical roots with the implementation maintained by V2Fly, but their ongoing feature development and configuration support aren’t identical. Even nodes using the same protocol, such as VLESS or VMess, may come with different transport, security, and extension parameters. To check compatibility, compare the full parameters with the core bundled in your client rather than looking at the protocol name alone.
Choosing a core is primarily about compatibility, not a simple speed ranking. Server requirements, the fields supported by the client, and network conditions can all affect the result. If a configuration works on one device but not another, compare core and parameter support first, then check whether copying or subscription conversion dropped any fields. Don’t assume the device lacks sufficient performance.
What the three open-source clients do
v2rayN is designed for desktop use, with menus for server lists, subscription groups, system proxy, and routing. Its desktop edition uses a cross-platform interface, while the classic WPF edition is for users familiar with the original UI. v2rayNG is designed for mobile devices and uses the Xray core, making it a good first choice on phones. v2flyNG offers an alternative based on the V2Fly core for configurations that require its capabilities.
All three clients are open source. Check each project’s license for terms on redistribution and modification; client and core licenses should be considered separately. Open source helps you understand how software works and how it’s maintained, but it doesn’t replace checking your subscription source, permissions, or local settings. This site’s download links and guides are not a proxy service and don’t guarantee that a connection will work.
Before updating, identify what’s changing
A client update may change the interface, configuration generation, or bundled core. A subscription update mainly refreshes the server list and parameters; these are different operations. If a menu has moved, search for it by function rather than changing a working configuration to match an old screenshot. The download page covers installers and platform requirements; the homepage doesn’t use a specific release number as a basis for choosing a client.
Before updating, note the node group, proxy method, and custom rules you’re using. If needed, save your configuration with the client’s built-in tools. After updating, test the basic connection first, then check custom routing and LAN sharing. If an issue started after the update, use the logs and configuration changes to narrow it down. Don’t change subscriptions, switch cores, and rewrite rules at the same time, or it’ll be hard to identify the cause.