v2rayN vs. v2rayNG
and v2flyNG

Choose v2rayN when you need to organize subscriptions, inspect rule order, or review logs on a computer. Its desktop lists show more configuration details at once, while subscription groups and routing settings are easier to adjust repeatedly. The benefit isn't inherently faster connections; it's greater visibility into what affects them: which core is active, whether an app uses the local listener, and which outbound a rule sends requests to.

For basic use, start with the system proxy. Import a subscription, select a working profile, and enable automatic system proxy configuration. Then test with an app that respects the system proxy. If an app isn't covered, check its own network settings first. Consider TUN only if you need broader traffic handling. TUN adds a virtual network adapter, permissions, and a DNS path, so don't enable it just because there's a switch in the interface.

The Windows download page offers a desktop edition and a classic WPF edition. The former uses a newer cross-platform interface; the latter retains the classic workflow. Choose based on your system and preferences—different interfaces don't necessarily mean different protocol support. On macOS, check the chip architecture; on Linux, check the package format and processor architecture. After installation, verify system proxy settings and TUN permissions separately.

If you don't have an existing core requirement, start with v2rayNG on Android. Import subscriptions, choose a profile, and connect from one mobile interface—handy for everyday network and profile switching. It uses the Xray core, but support for a given protocol combination depends on whether the included core supports the required transport, security settings, and extended fields. A protocol name such as VLESS or VMess alone doesn't guarantee that a configuration will work.

On Android, the key difference is how traffic enters the client. The VPN permission prompt during connection sets up a local traffic-handling tunnel; it isn't a step for buying a service or importing a subscription. Actual traffic coverage still depends on routing rules, per-app settings, and system restrictions. If another app is already using Android's VPN service, resolve that conflict first—don't assume both VPN connections can run as expected at the same time.

If the connection drops when the screen turns off or takes a while to recover after a network switch, check battery optimization, background activity, and the current network before blaming the configuration. You can work out complex routing logic on desktop first, but don't copy the entire v2rayN configuration directory to your phone. Subscription data and client preferences are separate; sharing a connection doesn't sync all DNS or per-app rules.

v2flyNG is best for users with a specific requirement: an existing configuration written for v2fly, or a need to reproduce that core's behavior on a phone. A similar name doesn't make it a drop-in replacement for v2rayNG. Protocol extensions, transport implementations, and configuration fields may differ. Choose based on server requirements, not merely whether the import button recognizes a share link.

For example, seeing a subscription in the list only means the client recognized some of its contents. A successful connection also depends on correctly preserved transport settings and encryption or security parameters. Don't expect features supported only by a specific Xray implementation to keep working with the v2fly core. Conversely, after migrating a configuration designed around v2fly behavior, verify routing and DNS results again.

If you have no specific compatibility reason, v2rayNG is still the better starting point for Android beginners because it means fewer variables to learn at once. If you do need v2flyNG, back up your settings, test a known configuration first, then restore subscriptions and routing gradually. Change one thing at a time when troubleshooting to identify whether the difference comes from import conversion, core support, or system-level traffic handling.