QuickSend

QuickSend is a cross-platform desktop app for sending files and text between computers on your local network. Pick a contact, attach one or more files, add an optional message, and send—received items show up in a dedicated inbox on the other machine.

Built with .NET and Avalonia UI.

Features

• Send panel — Choose an online receiver, write an optional message, and attach multiple files before sending.
• Receive panel — View incoming packages with sender info, timestamps, and file metadata; open messages or download attachments.
• Contacts — Add peers by ID, search your list, and see who is online or offline.
• Notifications — Bell icon in the sidebar for recent activity and unread counts.
• Profile — Account avatar and settings from the sidebar.
• First-run setup — Choose a username (no spaces) on the welcome screen before you start sharing.

Platforms

Windows, macOS, and Linux (x64). The project targets .NET 7 and is packaged as a desktop executable via Avalonia.

Getting started

Prerequisites

• .NET 7 SDK (or a newer SDK with roll-forward support)
• An IP lookup API key used to resolve your public IP for contact discovery (see below)

API key (IPKey.txt)

On startup the app needs a key for the whatismyip.com API. Either:

1. Place a file named IPKey.txt next to the built executable (digits in the file may be obfuscated—the app deciphers numeric characters automatically), or
2. Pass the key as the first command-line argument when launching.

Without a valid key, the app will not start.

Build and run

git clone <repository-url>
cd QuickSend
dotnet build
dotnet run --project QuickSend.csproj

For a release build:

dotnet build -c Release

The executable is produced under bin/Release/net7.0/ (or bin/Debug/net7.0/ for debug builds).

Using QuickSend

1. Launch the app and set your username on the welcome screen.
2. Add contacts from the contacts button in the right sidebar (peer IDs are exchanged out of band).
3. When a contact is online, select them under Receiver on the Send side, add files and/or a message, and click Send.
4. Incoming transfers appear under Receive; use the message actions to view text, download files, or save a ZIP.

Note: Transfers are intended for machines that can reach each other on the network (same LAN or routable peers). File size per attachment is limited to 2 GB.

Project layout

Path	Description
src/	Application code (views, view models, networking, utilities)
Assets/	Icons and UI images
docs/screenshots/	README and documentation images
QuickSend.csproj	Project file (assembly name may still read QuickSend until a full rename)

Tech stack

• UI: Avalonia 0.10, ReactiveUI
• Networking: TCP sockets for file and message transfer between peers
• Data: Local JSON metadata (contacts, user profile) under the app data folder

License

See the repository license file if one is provided; otherwise contact the maintainer for terms of use.