Use whatever already connects the two: your Wi-Fi, the phone's hotspot, or a USB cable. With a cable plugged in, Relay offers to turn USB tethering on. No camera on the laptop is fine; no list means you can scan the QR instead.

Watch it work

Sixty seconds, no narration: the two digits, the PC coming online, and a download that keeps running while the phone moves from Wi-Fi to LTE underneath it.

https://github.com/user-attachments/assets/fcfbc7ec-e61f-48c0-96b8-cd4713abb49b

_{The loop is drawn; the video above has sound. For the unedited real thing, KASRA MAX's four-minute walkthrough goes from install to browsing (Persian narration, English subtitles) — thank you, Kasra, for that and for the bugs you found.}

Download

	File	For
Windows	Relay-Setup-x64.exe	Windows 10/11 · installs for you alone, no admin
Android	Relay-android-arm64-v8a	Android 8+ · almost every phone since 2017
Android, any CPU	Relay-android-universal	If the one above says App not installed
Windows 32-bit	Relay-Setup-x86.exe	Only if you know you need it

• Windows warns on first run — the installer isn't code-signed yet: More info → Run anyway. Every release carries SHA256SUMS.txt to check it.
• "App not installed" on Android? Here is every cause seen so far.
• Updates: Windows updates itself when you're not connected. Android offers each update (the platform never allows a silent one), or use Obtainium to install them automatically.

With a VPN on the phone

Relay shares whatever the phone is connected to — including its VPN — and picks the route by itself, re-checking every ten seconds:

Your VPN app…	What to do
Lets local traffic through (most do)	Nothing. It just works.
Has "local network access" / "LAN access"	Turn it on.
Has a per-app list or a proxy-only mode	Exclude Relay, or switch to proxy-only, then turn the VPN off and on. Relay finds the VPN's local proxy and the PC still gets the VPN.

The honest limit: a VPN with none of those three options can't be shared — Android gives other apps no way around it. If one VPN doesn't work, its proxy-only mode or another VPN app usually will. The full story.

What you get

• Every app on the PC — one WireGuard tunnel carrying TCP and UDP, so games, calls and installers work, not just the browser.
• Honest status — "Connected" means a real handshake happened. The phone shows live speed; the PC shows speed, totals and latency.
• Keeps going — follows the phone to a new address and rides out packet loss and a switch from Wi-Fi to LTE.
• Leak protection — DNS and IPv6 can't slip around the tunnel, at 22 µs per connection. An optional kill switch blocks the internet if the phone stops answering.
• One tap away — Quick Settings tile, home-screen widget with the code, launcher shortcut; on Windows a tray app that can start with the system.
• English and فارسی throughout, right-to-left done properly, with screen-reader support on both platforms.

Privacy

• No accounts, no servers, no telemetry, no analytics. There is nowhere for your data to go.
• Keys are made per pairing and destroyed when sharing stops. They are never broadcast. A computer pairing by code gets nothing until you tap Allow on the phone, which shows its name.
• Nothing outlives the app. Relay changes no system-wide setting, so a crash cannot leave your PC broken.

Adding any network call beyond your own phone needs a written decision record — see CLAUDE.md and the ADRs.

Known limits

• One PC per sharing session, by design.
• IPv4 inside the tunnel; IPv6 is later.
• The Windows installer is unsigned for now; signing is next on the roadmap.
• What real hardware hasn't proved yet is listed in docs/testing.md, not hidden.

For developers

android/   Kotlin + Compose            windows/   .NET 8 + WinUI 3
wg/        WireGuard endpoint (Go)     shared/    the contract both apps are tested against

There is no local build step — CI is the build system (ADR-0004). Push a branch and it is built, tested on real Android images and a real Windows runner, and can be released. Before your first PR: change /shared first, write every string in English and Persian, and read docs/architecture.md and CONTRIBUTING.md.