01 / SHARE
Photos, videos, files.
Send files between phones, or move them between Android and Windows. They travel over the local network, without an internet upload. A 100 MiB limit per file applies in the current release.
BUILT FOR YOUR LOCAL NETWORK
Your devices.
In touch.
The photos on your phone. A file on your PC. A screen you need to see. Bring them together, right where they are.
ALTEK Link connects Android and Windows over your local network for messaging, file sharing, calls and remote screens. No account or internet connection required for local use.
YOUR DEVICES, ONE NETWORK LOCAL CONNECTION
WINDOWS01
ANDROID02
Interface previews · Names and profile images changed for privacy
01
THE IDEA
KEEP IT CLOSE
A good connection
doesn’t need to go far.
When two devices are already on the same network, sharing between them should be straightforward. ALTEK Link gives you a familiar chat window for the things you want to send—and a few useful ways to stay connected beyond that.
EVERYDAY TOOLS
One connection.
Plenty of uses.
From a quick photo to a remote screen, the same simple idea runs through the whole app: communicate directly on your local network.
02 / CHAT
Words are files too.
Send a link, a snippet of code or a message to the device beside you. The messenger-style interface feels familiar, even when there’s no internet.
03 / SCREEN
See the other screen.
Share a Windows or Android screen with a compatible PC or phone. Remote controls are available where the platform and its permissions allow them.
04 / CAMERA
Put a spare phone to work.
Make a video call to see a difficult-to-reach spot. Or arm an Android camera and let an approved contact view it on demand from another device.
Wi-Fi, or a phone hotspot. Internet access isn’t needed for ordinary local use. Devices do need to reach each other; hotspot isolation, firewall rules and hardware can affect discovery and performance.
A SMALL FOOTPRINT
Small enough to keep.
Useful enough to open.
The app is designed for devices old and new. These are the approximate sizes of the released files, before compression.
146 KiBAndroid APK
232–239 KiBWindows executable
795–952 KiBOpenH264 DLL · included with Windows
02
UNDER THE HOOD
A CLOSER LOOK
Simple to use.
Thoughtful underneath.
Android and Windows have separate implementations, connected by the same documented protocol. Here’s what happens behind the conversation.
Discovery stays local
Peers announce themselves using UDP broadcasts on the network. You can also probe a device by IPv4 address when automatic discovery isn’t available.
UDP / 45872Identity belongs to the device
Each installation has a self-signed certificate; connections use mutual TLS 1.2. Compare certificate fingerprints through a trusted channel to verify a contact—names and avatars alone don’t prove identity.
TLS / 1.2Transfers are checked
Messages are queued until acknowledged. Files are accepted by the receiver and verified with SHA-256 after transfer. An interrupted download starts again from the beginning.
SHA-256Media, without a middleman
Video uses H.264: MediaCodec on Android and OpenH264 on Windows. Audio is PCM. Calls and screen streams use separate encrypted TCP connections; actual quality depends on the devices and network.
H.264 / TLSBEFORE YOU START
A little about permissions.
Android 5 and newer use the system screen-capture permission. On Android 4.1–4.4, screen capture requires root. Remote touch control can use Accessibility on Android 7 and newer; older versions require root. Features and performance vary by device, and not every hardware and OS combination has been tested.
For on-demand camera viewing, the Android camera endpoint must be armed and the contact explicitly permitted. Windows can view an armed Android camera; it does not currently act as that camera endpoint.
GET ALTEK LINK
Ready when you are.
Choose a version for each device. The Windows packages include the matching OpenH264 video codec.
01 / ANDROIDAPK
Android
Android 4.1 and later
Version 0.1.16 · ~146 KiB
02 / WINDOWS64-BIT
Windows x64
Windows 7 and later
Version 0.1.7 · Build 14
03 / WINDOWS32-BIT
Windows x86
Windows 7 and later
Version 0.1.7 · Build 14
Windows executables are not Authenticode-signed and may trigger a SmartScreen warning. These are early releases; check the release notes for details.