Open-Source Projects & Maintenance
Project V, V2Fly & Xray Core
Keep the project ecosystem, proxy cores, and graphical clients distinct. Downloading a client is just the first step; understanding how the components fit together helps avoid mistakes when choosing a setup or troubleshooting.
How Cores and Interfaces Work Together
Project V is an open-source ecosystem built around proxy communication tools, with V2Ray as one of its major projects. V2Fly continues development related to V2Ray, while Xray has developed into an independent core. They share some technical history, but their feature development, configuration fields, and compatibility are not always the same. When choosing a configuration, check which core is actually running instead of relying on “V2Ray” as a catch-all label.
The core handles connections, transport, resolution, and routing. A graphical client provides an interface for managing servers, updating subscriptions, and configuring system settings. v2rayN, v2rayNG, and v2flyNG are separate graphical clients, not simply the same app renamed for different operating systems. Desktop and Android platforms also differ in system capabilities, so permissions, traffic entry points, and background behavior vary.
A protocol name alone does not describe a complete configuration. A connection also depends on transport, security, authentication parameters, and server-side requirements. Seeing the same VLESS or Trojan label does not mean every core and parameter combination is interchangeable. Keep the original settings from your provider, choose a core that meets the compatibility requirements, and use the logs to identify specific fields. This is more effective than repeatedly trying options based on protocol names alone.
Choose by Client
v2rayN: Designed for desktop use, with subscription groups, active servers, local listeners, and routing managed in one place. On Windows, choose the desktop or classic WPF edition based on your interface preference and system requirements; for macOS and Linux, use the appropriate desktop download. For a framework comparison, see the Avalonia vs. WPF Edition Guide. Interface differences do not directly indicate differences in protocol support.
v2rayNG: Designed for Android and uses the Xray core, making it a good starting point for Android setup and usage guides. The first time you connect, approve the system VPN permission prompt. Long-term use may also require adjusting background activity restrictions. If problems occur only after the screen locks or you switch apps, check app permissions and battery settings before investigating network or configuration changes.
v2flyNG: Also designed for Android, it uses the V2Fly core and is an alternative when a configuration requires that core. Do not assume its fields, import results, or protocol support exactly match v2rayNG. When switching clients, test one configuration known to be compatible before moving your usual groups, so differences are easier to identify.
Understand Open-Source Licenses by Component
All three clients are maintained as open-source projects. Clients, proxy cores, and dependencies may each use different open-source licenses. Before using, modifying, or redistributing them, read the license terms and notices for each component. Open source makes code and development available for review; it does not mean every third-party subscription, server, or network environment is equally reliable.
The client being free to use is separate from the availability of server resources. Installing a client does not provide a working server or generate a valid subscription. Connection details, authentication parameters, and service availability depend on the configuration source. Keep the source information you need for your records, but never publish full subscription URLs in public pages, support screenshots, or shared documents.
Check Four Types of Updates Separately
Track changes to the client, core, subscription, and routing data separately. A client update may move menus; a core update may affect parameter compatibility; a subscription update may replace server configurations; and routing data updates may change category matches. Handle one type of change at a time to make it easier to restore the last working setup if something goes wrong.
Before updating, back up essential settings and note custom rules and local listener options. After restoring a configuration, recheck the active server, system proxy, and TUN status. Backups may contain authentication details, so store them securely. If a problem starts after an update, review the error logs and settings differences before deciding whether to roll back; reinstalling every component is rarely the first step.
Keep a short routine checklist: confirm the subscription update, check the active server, test your usual apps, then verify direct connections and local network access. When adding routing exceptions, note their purpose and match criteria, and remove rules you no longer need. For a step-by-step learning path, see the Beginner-to-Advanced Guide. If a setting is unfamiliar, check its meaning in the Concept Reference before changing it.