OLL is a simple application for keeping a One Line Log.

One line logs can be useful for many things. I have used them to track how much time I am spending on projects at work - after logging activities for a while I could see how much time I had spent on different tasks. I have also used a one line log for tracking runs; using the log I could see more clearly where I first noticed an injury and how long I had it.

You can also use one line logs for various other tasks including recording notes on phone conversations or meetings, capturing ideas, recording reminders for a todo list, etc.

The idea behind OLL is that it has a small desktop footprint so that it can be run continuously. When you need to log something you type it into the edit box and press return or click on Log. A date time stamp and the log entry are appended to a plain text file that you can easily edit later.

I want to keep OLL very simple in terms of user interface and code. It will never be completely minimal because I am using Qt as I do with most of my projects.


OLL Linux




OLL Windows

Windows 10

Example Log

2017.02.05T22:22 OLL new icon finished
2017.02.05T22:23 Todo: build on Mac and Windows
2017.02.07T20:10 Built and deployed Windows version
2017.02.08T23:43 Added more details to OLL web page

In this excerpt you can see the kind of output that OLL produces. The middle line is a rule.

Special Commands

There are a few special log commands, entered as a single word into OLL. They are:

Add a plain text ruler line to the log file
Open the settings window
Open a window listing the last entries of the log
About OLL. Lists the available commands. You can also use help to get here

Preemptive FAQ

What is the length of a line ?
The default maximum is 32k characters but for formatting purposes you should probably keep it less than 80 characters.

Do you support my language ?
Yes, logs are stored in UTF-8 text. The Windows version outputs a BOM at the start of the log so Windows can properly identify the text coding.

How do you specify the date time stamp ?
See the documentation for QDateTime::toString().


File Platform Size MD5
OLL-1.1-x86_64.AppImage Linux 28 MB fab66271fdd908ffdcb4d2e29ac9c47b
OLL-1.1.dmg MacOS X 27 MB 7e97e5574171166ff843b71dbfd267af
OLL-1.1-win.zip Windows 8 MB f589049efc20e1704be70b0f069b7bb7


The Linux version is packaged using AppImage to make a distribution agnostic executable. Download the file, rename it to OLL, make it executable using chmod a+x OLL and run.

For the Mac version, download the DMG, double click to mount it and copy the OLL application to your Applications folder. You may need to change your Security and Privacy preferences to allow you to run applications from "identified developers".

The Windows version is not digitally signed and therefore you may have to deal with annoying warnings claiming that this application is dangerous. Unzip the download and copy the OLL-X.Y directory to somewhere on your PC. You can then make a shortcut to OLL and place it on your desktop, copy it to your startup directory, etc. Open the log file in Notepad for editing.


This software is licensed under the GNU GPL (version 3).