A lightweight Windows desktop VPN client built with Flutter and powered by sing-box.
Input VPN is a free, open-source VPN client for Windows 10/11. It connects using the modern sing-box core and supports the most popular proxy protocols out of the box. No extra software required — just add your config and connect.
- Protocols — VLESS, VMess, Trojan, Shadowsocks (incl. REALITY).
- System VPN (TUN) — full-system tunnel; UAC is requested once on first launch and never again.
- SOCKS5 Proxy mode — local proxy on
127.0.0.1:11080, no admin rights needed. - Subscriptions — add a single link or an entire subscription URL (Base64 / plain text).
- Server management — latency display, selection, rename, edit, delete.
- Live stats — real-time upload / download speed, total traffic, and ping on the main screen.
- Crash watchdog — auto-reconnects if the VPN core exits unexpectedly.
- Event log — timestamped connection history and error log.
- Split tunneling — choose which apps bypass the VPN (Windows settings).
- DNS presets — switch between Cloudflare, Google, Quad9, or custom DNS.
- Tray mode — minimize to system tray instead of closing.
- Themes & language — dark / light mode, Russian / English interface.
- Auto update check — built-in check for new releases via GitHub.
- Go to Releases.
- Download
InputVPN-Setup.exe. - Run the installer and follow the prompts.
- Launch Input VPN from the Start Menu or Desktop.
- Add a server
- Open the Servers tab.
- Paste a single link (
vless://...,vmess://...,ss://...,trojan://...) or a subscription URL.
- Select & connect
- Tap the server you want to use.
- Press the big power button on the home screen.
- On the very first launch the app registers a background task — you will see one UAC prompt. After that, connects are silent.
- Done!
- Your public IP, ping, and live traffic stats appear on the main screen.
| Setting | What it does |
|---|---|
| SOCKS Debug Mode | Runs sing-box as a local SOCKS5 proxy instead of system TUN. No UAC needed. |
| Minimize to Tray | Closing the window hides the app to the system tray instead of quitting. |
| Split Tunneling | Pick apps that should bypass the VPN tunnel. |
| DNS | Choose a preset (Cloudflare, Google, Quad9) or enter custom DNS servers. |
| Auto-Update Subscription | Periodically refreshes your subscription URL in the background. |
| Dark Mode | Toggle between light and dark themes. |
| Language | Switch between English and Русский. |
| Symptom | Fix |
|---|---|
| "VPN engine failed to start" | Make sure sing-box.exe is bundled with the app (it ships inside the installer). |
| UAC prompt on every connect | Should only happen on the very first launch. If it repeats, delete %APPDATA%\inputvpn\Input VPN\ to reset app state. |
| No traffic / 0 KB/s | The server may be offline or the config has an invalid UUID/SNI. Test the same config in another client. |
| App won't start / crashes on launch | Delete %APPDATA%\inputvpn\Input VPN\singbox\ to clear corrupted config and logs. |
| Latency shows "—" | The server is unreachable or the ICMP ping is blocked by the remote host. |
- Windows 10 version 1809+ or Windows 11
- 64-bit (x64) architecture
- Administrator rights (once, on first launch only)
- Flutter stable with Windows desktop support enabled
- Visual Studio 2022 — "Desktop development with C++" workload required
sing-box.exe(v1.13.x, Win64) +wintun.dllplaced inwindows/runner/resources/- Inno Setup 6 — only needed to build the installer
flutter pub get
flutter build windows --release
# Portable build: build\windows\x64\runner\Release\iscc installer.iss
# Output: Output\InputVPN-Setup.exeSee CLAUDE.md for architecture overview, coding conventions, and engineering rules.
MIT