Implementations

Official Shadowsocks implementations under active maintenance:

Servers

• shadowsocks: The original Python implementation.
• shadowsocks-libev: Lightweight C implementation for embedded devices and low end boxes. Very small footprint (several megabytes) for thousands of connections.
• shadowsocks-go: Go implementation with multi-port, multi-password, user management and traffic statistics support for commercial deployments.
• go-shadowsocks2: Another Go implementation focusing on core features and code reusability.

Feature comparison

	ss	ss-libev	ss-go	go-ss2
TCP Fast Open	✓	✓	✗	✗
Multiuser	✓	✓	✓	✗
Management API	✓	✓	✗	✗
Redirect mode	✗	✓	✗	✓
Tunnel mode	✓	✓	✗	✓
UDP Relay	✓	✓	✓	✓
AEAD ciphers	✓	✓	✗	✓
Plugin	✗	✓	✗	✗

Clients

• shadowsocks-android: Android client.
• shadowsocks-windows: Windows client.
• shadowsocksX-NG: MacOS client.
• shadowsocks-qt5: Cross-platform client for Windows/MacOS/Linux.

Feature comparison

	ss-win	ssx-ng	ss-qt5	ss-android
System Proxy	✓	✓	✗	✓
CHNRoutes	✓	✓	✗	✓
PAC Configuration	✓	✓	✗	✗
Profile Switching	✓	✓	✓	✓
QR Code Scan	✓	✓	✓	✓
QR Code Generation	✓	✓	✓	✓