Download

Bring your station.
Make your first contact.

OpenJSQ 1.1.0 is free to download for Windows, Linux and Raspberry Pi. There is no licence key to request and no expiry date. Released 2 November 2026.

Choose your download → First-contact checklist →

OpenJSQ asks you once whether to check for a newer version, and makes no connection until you answer. If you say yes, it asks www.openjsq.com which version is newest when it starts, at most once a day. The request reveals your IP address and app version, but sends no callsign or messages. We count these existing checks by app version to understand release adoption, without storing IP addresses or installation identifiers in our statistics database. It downloads and installs nothing. Change your answer in Settings › About & storage › Updates. Privacy details →

Pick your computer.

Check a download against its SHA-256 before you run it. In Windows PowerShell: Get-FileHash .\file. On Linux: sha256sum file. The two should match exactly. Each file’s line is also in SHA256SUMS.txt, kept beside the files. What changed in 1.1.0 →

What you need.

Windows
Windows 10 or 11, 64-bit.
Linux
Ubuntu 24.04 or newer, 64-bit x86 (the AppImage needs glibc 2.39 or newer). Two system packages may need installing; see Troubleshooting.
Raspberry Pi
A Raspberry Pi 4 or 5 running 64-bit Raspberry Pi OS (arm64), Bookworm or Trixie. The package is experimental.
Where your data lives
Settings, profiles, history and mail: %LOCALAPPDATA%\OpenJSQ\OpenJSQ on Windows, ~/.local/share/OpenJSQ/OpenJSQ on Linux and Raspberry Pi. Your files folder is Documents\OpenJSQ (~/Documents/OpenJSQ on Linux) by default. Neither is inside the program, so an upgrade or a moved AppImage leaves them alone.
Your station
A radio and an audio interface (a DigiRig, a SignaLink, or a USB radio’s own sound device), or an external KISS TNC for AX1200. See the first-contact checklist and the operator guide.

Windows says it doesn’t know this app.

Neither the Windows Installer nor the Windows Standalone ZIP is code-signed, so Windows SmartScreen may show a blue “Windows protected your PC” box the first time. Choose More info, then Run anyway. Check the file’s SHA-256 against the one above (or SHA256SUMS.txt) first: that is how you know it is the file we published. More about SmartScreen →

Free, with no strings.

Cost and expiry
Free. No callsign licence from us, no account, no expiry date. The program does not stop working on a date.
Sharing
The licence agreement lets you give an unmodified copy of the official installer or ZIP to another operator.
How a new install behaves
A new installation starts on the Community station style. It answers questions, carries and repeats for other stations, and holds mail for stations that are off the air, within an airtime budget (2 minutes in 10 for automatic answers, 3 in 10 for forwarding). The setup wizard offers Careful, which answers questions but carries, repeats and holds nothing for others, and Performance, with larger allowances. Settings changes the style at any time. No style turns on unlimited airtime or removes the HF limits.
Experimental limits
JG25 remains experimental, and legacy FSQ or AX.25 compatibility does not provide every JSQ service. The site’s file times are modeled, and its app images show examples. Read the evidence and limits.
What “Open” means here
The on-air protocols are publicly documented for implementation. The OpenJSQ application is separately licensed software, free for personal and nonprofit use; the published protocols do not grant rights to modify or redistribute the app.
Support
Support is by the community. See Support, Known issues and Privacy.

This summary follows the licence agreement and the operator guide.

Public protocols.
A separate application licence.

The JSQ specifications are public so other applications can implement compatible services. OpenJSQ is free for personal and nonprofit use under its application licence; that is separate from an open-source software licence. The operator guide covers setup and daily operation.