SFAxtnd

🛰️ SFAxtnd — Extended Sing-box Client for Android

SFAxtnd is a modified Android client based on SFA (sing-box-for-Android), bringing additional subscription-management capabilities, persistent HWID handling and flexible node processing to the Sing-box experience.

Built for users who work with subscription panels and multiple proxy configurations, SFAxtnd focuses on making profile management and node importing more convenient.

⚡ Sing-box Powered

SFAxtnd uses the Sing-box Android architecture as its foundation, providing a modern networking core for managing supported proxy configurations.

🔑 Smart Subscription HWID

One of the project's key additions is its subscription HWID system. SFAxtnd generates a unique 16-digit device identifier for each subscription link and stores it persistently.

When the same subscription is updated again, the corresponding HWID is reused instead of generating a new identifier.

📦 Flexible Node Parsing

SFAxtnd can process different subscription and configuration formats, including:

• Raw JSON node arrays • Happ-style data • Sing-box configurations • VLESS links • VMess links • Trojan links • Shadowsocks links

This makes it easier to work with different subscription sources without manually converting every node.

🔄 Subscription Management

The extended node-processing system is designed for subscription-based setups, helping users maintain profiles and update their configurations while preserving the associated HWID.

📱 Android Optimized

SFAxtnd is designed specifically for Android and provides architecture-specific releases for different devices:

• ARM64-v8a • ARMv7 • Universal

This allows users to select an appropriate package for their device or use the universal build when preferred.

🧩 Independent Fork

SFAxtnd is an independent fork of SFA (sing-box-for-Android) by Nekohasekai. It has been renamed and modified to distinguish it from the official Sing-box client.

🛡️ Open Source

The project is distributed under the GNU GPL-3.0 license, with its source code publicly available for inspection and further development.

✨ Key Features

• Sing-box based Android client • Persistent per-subscription HWID • Automatic 16-digit HWID generation • Flexible node parsing • JSON node support • VLESS / VMess / Trojan / Shadowsocks links • Subscription-focused workflow • ARM64, ARMv7 & Universal builds • Open-source GPL-3.0

🚀 SFAxtnd extends the familiar Sing-box Android experience with smarter subscription identification and flexible node processing for users who manage multiple proxy sources.