jLog is a modern Logging program for Hams. It can run on all major platforms, e.g. macOS, Linux, Windows, etc. It offers a nice, clean interface and allows efficient entry of QSOs.

It is available for free so you can afford to try it!

You won't get stuck with jLog. Import or Export of data using standardized ADIF 3 formats is possible to easily exchange data with any other decent logging program.

Key features

The simplicity of use, consistant across platforms is followed by many functional advantages, such as e.g

  • Real-time integrations

    Real-time integration with WSJT-X for logging and color coding entries of interest

  • Internet lookups and logging

    QRZ and HamQTH lookups. Real-time logging with eQSL and LoTW.

  • Many QTHs in a single log

    Keep track of QTHs, rigs, etc. and the TQSL Locations and eQSL Nicknames.

  • Powerful QSL tracking

    Separate tracking of Paper, eQSL and LoTW QSL status with status reporting

  • Fast searches

    Search a huge log in less than a second.

  • Updated Award Status

    Automatic Award status and Reports, e.g. "WAS"-type for 28 countries.

Key characteristics

The Main Window is always present and contains essential information in a single view, i.e, without pop-ups or page shifts. Four key components of jLog are briefly described below.

The Main Window

Available with selectable light or dark themes. May be set to change with the system theme.

A Botton Bar at the top with frequently used buttons.

Then the Main Window with the Log overview. Navigate up/down using the Up/Down-keys. Open a selected entry by pushing the Space Bar.

A continuously updated Status Window below, updated as the different rows of the Main Window are selected.

The Previous Field below is also continuously updated and is showing either previous contacts with the same station or the same country (selectable).

                Main window

Entry window

The Entry window allows entry of new QSOs and display or modification of existing QSOs. The macOS Look and Feel is shown but the look is very similar on Linux and Windows.

For new QSOs, time, frequency and mode is automatically updated from the radio.

The Profile

The Profile is where most of the settings or preferences are kept.

Configurations are typically used to reflect alternative QTHs, but can be used to reflect e.g. guest Operators or Rigs (in case multiple rigs can be used for a given frequency or mode). These parameters can be closely linked to the TQSL 'Locations' and 'eQSL 'Nicknames'.

Other settings are typical favourite settings, eQSL and LoTW setting, and DX Clusters or Spots settings.

              Entry window

The WSJT-X Tracker

The WSJT-X Tracker (or just Tracker for short) is a built-in tool that links jLog and WSJT-X to provide extended capabilities. It assists the user in keeping track of confirmed Countries, Prefixes, US States and US Counties by both color coding callsigns in WSJT-X entries and by it own list of potential stations of interest. The logic is similar to the color coding of entries in WSJT-X.

WSJT-X indicates e.g. whether or not a specific country has been worked or not. The WSJT-X Tracker on the other hand, indicates whether or not a specific country has been confirmed or not. Confirmation status can be related to both eQSL and LoTW. It will also take into account whether or not the station of interest is listed as an Authenticity Guaranteed (AG) eQSL user or as a confirmed user of LoTW.

wsjt-x example2
wsjt-x example1


Stay updated regarding new releases or other critical information by following @jlogorg on Twitter. See an example of a recent tweet below:

X/Twitter picture
El-keyer picture

Download jLog

jLog is installed and later updated by downloading a single installer file

New release jLog V6.10 made available on 18 November 2023
A non-critical update that introduces additional flexible columns, better updated serial drivers, and ability to restart radio drivers inside jLog, etc. More in the Release notes.

Prior to jLog V 6.7, a Java Runtime Environment had to be installed before installing jLog. This is no longer necessary.

Although the jLog application is the same for any platform, separate installers are available for each major platform to simplify the installation task. The optional serial port used for CAT control and keyer control may require platform specific drivers.

Please do remember to regularly check for updates. Errors are being fixed and new functionality may be added.

Go to the installer page for your platform,

Older versions of jLog

Very old versions (V 6.6 or older) are only available on the old jLog Website

Interested in propagations?: Solar Cycle 25 Sunspot Number Trend


Please feel free to contact jLog Support (mail@jlog.org) for:

  • reporting bugs or potential bugs
  • suggesting improved/new functionality
  • some assistance with application installation, Log conversion, etc.



jLog is Copyright © 2001 – 2023 LA3HM Arve Olaussen. All Rights Reserved.

jLog can be freely distributed and installed for non-commercial use by licensed Radio Amateurs. However, you must not distribute copies of your personal Registration Code.

The jLog Author takes no responsibility for possible loss of data. Make frequent backup copies of your work, preferably to another disk (or at least disk area). Report any problems to mail@jlog.org.

Java Runtime Environment (JRE) and Installers

OpenJDK 21 JRE is Copyright (c) 1995, 2012, Oracle and/or its affiliates. All rights reserved. Distribution licensed under GNU GPL V2 with the Classpath Exception.


jLog V5 and newer uses PureJavaComm. No changes has been made to the standard distribution.

Copyright (c) Facecast

Licensed under Apache License 2.0

Apache Commons Logging and Commons Net

Copyright 2003-2007 The Apache Software Foundation 

Licensed under Apache License 2.0

The Java™ Architecture for XML Binding (JAXB)

2013 Oracle Corporation and/or its affiliates. All rights reserved.

JAXB is licensed under GNU GPL V2 with the Classpath Exception

JavaBeans Activation Framework (JAF)

Oracle Corporation and/or its affiliates. All rights reserved.

Licensed under Common Development and Distribution License (CDDL) v1.0

Java Native Access

Licensed under Apache 2.0 or LGPL 2.1

Swing Component Extensions (SwingX)

Copyright (C) 1991, 1999 Free Software Foundation, Inc

Licensed under GNU Lesser General Public License Version 2.1


Licensed under the GNU Lesser General Public License (LGPL)


Licensed under Apache License 2.0

iStack Common Utility Code

Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.

Licensed under EDL 1.0

Simple Logging Facade for Java (SLF4J)

Copyright Ceki Gulcu

Licensed under Apache License 2.0


Copyright JetBrains

Licensed under Apache License 2.0

Java Native Access Platform

Copyright Timothy Wall

Licensed under Apache License 2.0

Version Compare

Copyright Thomas Wirth

Licensed under Apache License 2.0

Java Foundation Access

Copyright Jan Gassen

Licensed under Apache License 2.0

Operating System Hardware Information (Java)

Licensed under the MIT License

FlatLAF - Flat Look and Feel

Copyright © 2019-2022 FormDev Software GmbH. All rights reserved.

Licensed under the Apache License 2.0

One Dark theme

Copyright 2022 Mark Skelton

Licensed under the ISC License

Darcula Darker theme

Copyright (c) Vecheslav Druzhbin

Licensed under the MIT License

Light Flat theme

Copyright (c) 2019 Artem Bukhonov

Licensed under the MIT License

Hiberbee Dark theme

Copyright (c) 2019 Vlad Volkov

Licensed under the MIT License

jGoodies Forms

Copyright (c) JGoodies Software GmbH

Licensed under Simplified BSD License


Licensed under Apache License 2.0



Policy statement

The purpose of this web-site is solely to provide information about jLog and to allow potential users to download the jLog application. No user information is collected and such information can therefore not be stored nor transferred to any third parties.


Any changes to this policy will be posted as updates to this statement.


Please contact the author by e-mail to mail@jlog.org if you have any questions.