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Windows Meeting Timer using C#, WPF and custom analogue clock control. Designed for use in Kingdom Halls where the meeting format is predefined, but has a "manual" and "file-based" mode that can be used to configure the timers as required (and so can be used in other settings too).

Main Window

Timer Display

System Requirements

  • Windows 7, 8 or 10
  • .NET Framework 4.7 or later
  • 2GB RAM
  • 20MB Hard disk space
  • Internet connection (for "Automatic" Operating Mode only)


If you just want to install the application, please download the OnlyTSetup.exe file.


See the wiki for basic instructions and for information on where to get further help.

See the FAQ for frequently asked questions.

License, etc

OnlyT is Copyright © 2018 Antony Corbett and other contributors under the MIT license.

NAudio (Mark Heath) is used under the Microsoft Public License (Ms-PL). GalaSoft MVVM Light (Laurent Bugnion et al). MaterialDesign themes (James Willock, Mulholland Software and Contributors) is used under the MIT license. NUglify, Copyright (c) 2016, Alexandre Mutel. QRCode (Raffael Herrmann) is used under MIT. Serilog is used under the Apache License Version 2.0, January 2004. LiteDB (Mauricio David) is used under the MIT License. PDFSharp is used under the MIT License.

With thanks to:

  • for localisation tools
  • GitHub for project management tools
  • A team of over 20 translators who have helped localise OnlyT
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