A cross-platform VPN client built on sing-box.
Desktop first — Windows is user-ready; macOS ships but is for advanced users (see below). A shared Go core is meant to extend to Linux, Android and iOS.

Project status — early development. The desktop client is the current focus. The core, the control protocol and the UI are in good shape and well tested, but the real tunnel path (wintun + sing-box, which needs an elevated live run) is still being validated end to end. Treat this as pre-release: not yet "production-ready", and expect things to move around. See Project status for the honest breakdown.

Why another client

Most clients either lock you into a single protocol or are vague about what they do with your traffic. Tenebra:

• speaks the protocols sing-box supports — VLESS/REALITY, Hysteria2, AmneziaWG, Shadowsocks, Trojan, VMess;
• routes Russian destinations directly and sends everything else through the tunnel, so latency-sensitive local traffic stays local;
• falls back between protocols when one gets throttled or blocked, and remembers what worked;
• ships no telemetry, no accounts and no bundled servers — you import your own subscription.

What it does

Everything below is implemented in this repo today (the UI features are desktop):

• Many protocols, one model. Import VLESS (incl. REALITY), Hysteria2, AmneziaWG, Shadowsocks, Trojan and VMess. A single normalized node model feeds a from-scratch sing-box config generator. (AmneziaWG links import and connect, but the bundled stock sing-box applies none of the AWG obfuscation parameters — the tunnel runs as plain WireGuard; full AmneziaWG obfuscation is on the roadmap.)
• Import the way you have it. Subscription URL, a raw share link, a .txt file of links, clipboard paste, or a QR code (image file or pasted image). Subscription bodies handle a Clash/Mihomo YAML config, base64, or plaintext link lists and read the Subscription-Userinfo header for traffic used / total and expiry.
• Smart RU routing. Smart keeps Russian domains and IPs (and your LAN) direct and tunnels the rest; Global tunnels everything; Direct is the proxy off. Geodata is pulled from the official public sing-geoip / sing-geosite rule-sets at runtime — the client ships none of its own.
• Protocol fallback. A pure state machine walks the last known-good node first, then by protocol preference (REALITY → Hysteria2 → AmneziaWG), so a blocked or throttled protocol is retried as another. The last good node leads the next launch.
• Per-app split tunnelling. Exclude sends chosen apps around the tunnel; Include sends only chosen apps through it. Matched by executable name and persisted across restarts.
• Honest leak check. Observes the machine's public IP from redundant echo services and runs a best-effort DNS probe, then reports a verdict that never fakes a pass — it tells you what it could not measure rather than claiming "safe". See docs/control-protocol.md.
• Desktop niceties. System tray that reflects the connection state (with quick connect/disconnect), desktop notifications on state changes, tenebra:// deep links (import a subscription or connect a profile), launch at login (optionally minimized to the tray), single-instance, live traffic graphs, light/dark themes, and English / Russian UI.

The kill-switch (drop proxied traffic instead of leaking when the tunnel drops) is a UI toggle — best-effort by design, with the exact guarantee described in the changelog; LAN bypass is a core routing option.

Getting a server

Tenebra is a client — it ships no servers and hard-codes nothing. You bring your own endpoint and import it as a subscription or a share link. Two ways to get one:

• Run your own. Any sing-box or Xray server works; point Tenebra at its subscription URL.
• Use a provider. Any service that hands you a subscription or a share link will do. I run one at vpsxd.pro.

Project status

Area	State
Go core (parsing, profiles, routing, config gen, fallback, leak logic)	Implemented, unit-tested, no third-party deps
Control protocol (core ↔ UI)	Implemented; covered by Go tests and a real-binary e2e
Desktop UI (Tauri 2 + React)	Implemented: all screens, reactive tray, notifications, deep links, autostart, i18n, themes
Windows tunnel (wintun + sing-box)	Implemented — a background service runs the tunnel, so the app connects without an elevated GUI; installer sets it up, the in-app updater refreshes both app and service
macOS tunnel (utun + sing-box)	Builds and runs — universal .app/DMG — but see the macOS note below: it needs a hand-installed root daemon and is not yet a click-to-run product
Linux / Android / iOS	Planned — the core is shared and platform-agnostic
Release pipeline	Tag-triggered release workflow builds the Windows and macOS bundles, minisign-signs the in-app updater artifacts, and publishes a GitHub release
Code-signing	Not set up — the Windows installer is Authenticode-unsigned (SmartScreen warns) and the macOS build is unsigned/un-notarized (Gatekeeper needs a manual "Open Anyway")

macOS note — read before downloading the DMG

The macOS build is for advanced users right now, not a finished product. Two things are not yet in place, so a plain "download the DMG and drag to Applications" will not give you a working tunnel:

• The tunnel needs a privileged helper. macOS only lets root open the utun device, so the app talks to a small root LaunchDaemon that owns the tunnel. That daemon is currently installed by hand with a sudo script (scripts/macos/install-daemon.sh) — there is no in-app installer for it yet. Without it, the app runs but cannot connect.
• The build is unsigned and un-notarized. First launch needs System Settings → Privacy & Security → Open Anyway, and updates to the daemon are a manual step (the in-app updater refreshes only the app, not the root daemon). Since 0.4.4 the app warns with a banner when the daemon has fallen behind it; re-run the install script from your checkout to update: sudo bash scripts/macos/install-daemon.sh --from-app /Applications/Tenebra.app --allow-unsigned.

The click-to-run macOS path — a signed, notarized build with an SMAppService daemon bundled inside the app (so it installs and updates like the Windows service) — needs an Apple Developer ID and is planned, not done. Until then, use the DMG only if you're comfortable running the install script yourself. Windows users are unaffected — the Windows installer sets up the service and the updater keeps everything current automatically.

If you want to help close the gap, the macOS SMAppService path and the non-desktop adapters are the highest-leverage places — see CONTRIBUTING.md.

Repository layout

tenebra/
├── core/                 Go. Platform-agnostic, stdlib-only, fully unit-tested.
│   ├── model/            Normalized proxy node + config types.
│   ├── subscription/     Parse vless/hysteria2/ss/trojan/vmess links + sub bodies.
│   ├── profile/          Named profiles and their atomic on-disk store.
│   ├── routing/          smart/global/direct + per-app split -> sing-box route/dns.
│   ├── singbox/          Build a full sing-box config as plain JSON (no sing-box dep).
│   ├── fallback/         Pure REALITY->Hysteria2->AmneziaWG fallback state machine.
│   └── control/          The line-delimited JSON protocol + the daemon.
├── adapters/
│   └── windows/          Spawn & supervise sing-box; traffic via its clash API.
├── cmd/
│   └── tenebra-core/     The sidecar entry point (talks the protocol on stdin/stdout).
├── ui-desktop/           Tauri 2 app: Rust shell (src-tauri) + React/TS front end (src).
├── scripts/
│   └── fetch-resources.ps1   Download pinned sing-box + wintun for bundling.
└── docs/                 Architecture, control protocol, and the dev guide.

Building

Requirements: Go 1.24+, Node 22+, and the Rust toolchain (for the desktop UI). Full walkthrough and troubleshooting in docs/development.md.

Core tests:

go test ./...

Desktop app (Windows):

# fetch the sing-box binary and wintun.dll into src-tauri/resources
powershell -File scripts/fetch-resources.ps1

# build the core sidecar where Tauri bundles it
go build -o ui-desktop/src-tauri/binaries/tenebra-core-x86_64-pc-windows-msvc.exe ./cmd/tenebra-core

# build the bundle
cd ui-desktop
npm install
npm run tauri build

Documentation

• docs/ — documentation index.
• docs/architecture.md — the layers and how they connect.
• docs/control-protocol.md — the core ↔ UI wire format.
• docs/development.md — set up, build, run and test.
• CONTRIBUTING.md — how to contribute.
• SECURITY.md — reporting a vulnerability and our trust stance.
• CHANGELOG.md — what's changed.
• ROADMAP.md — where the project is headed.

Support

Tenebra is maintained by one person in their spare time, so please keep support low-friction:

• Questions or help — start a thread in Discussions.
• Bugs — file a report through the issue form; it asks for your version, Windows build and logs.
• Security problems — follow SECURITY.md; please don't open a public issue.

Response times vary — this is a side project, not a supported product. Thanks for your patience.

License

GPLv3 — see LICENSE. sing-box is GPLv3, so Tenebra is too. Bundled third-party components and their licenses are listed in THIRD-PARTY-NOTICES.md.