Hiddify is a cross-platform proxy/VPN client built with Flutter and a Go core (Sing-box). It supports multiple proxy protocols (Vless, Vmess, Reality, TUIC, Hysteria, WireGuard, SSH, etc.), subscription management, per-app proxy, routing rules, chain configuration, and advanced features like Warp, Psiphon, and TLS tricks. The architecture is a Flutter frontend communicating with a Go backend via gRPC/protobuf over a local socket. The app uses Riverpod for state management, drift for local SQLite storage, freezed for immutable models, and go_router for navigation. It has platform-specific native code for Android (Kotlin), iOS/macOS (Swift), Windows (C++), and Linux (C). The codebase is well-organized into feature modules, core infrastructure, and generated protobuf bindings. It is actively maintained with CI/CD pipelines and multi-platform releases, though it contains some commented-out code and generated file churn.

Hiddify-Manager is a comprehensive anti-censorship proxy/VPN management system designed for multi-user environments. It orchestrates a suite of proxy cores (Xray, Sing-Box, HAProxy, Nginx, WireGuard, etc.) via systemd services, a Flask-based web panel, and a CLI tool. The system supports over 20 protocols (VLESS, VMess, Trojan, Shadowsocks, Reality, Telegram proxies, DNS tunnels) and is optimized for regions with heavy internet censorship (Iran, China, Russia). It provides automated installation, configuration generation via Jinja2 templates, multi-node support, Docker deployment, and cloud-init/Terraform scripts for cloud provisioning. The codebase is actively maintained with frequent updates, but contains deprecated services and a large shell script surface that introduces maintenance complexity.