a free and powerful circuit simulator

Latest News

Version 4.3.1 released

26th September 2022

QucsStudio Version 4.3.1 is now available. Besides several bugfixes, the new version exhibits the following new features:
  • Analyse antennas with the EM simulator
  • Calculate slotlines with the tool Line Calculation
  • Calculate arbitrary transmission lines with the tool Line Calculation
Again, the biggest thanks to all who donate to this project. You made the new release become reality!

Illegal Usage of QucsStudio

1st November 2021

The company muRata uses parts of QucsTransline illegally, i.e. without mentioning the origin. (e.g. here) No reaction followed the request to change this.

Version 4.2.2 released

26th June 2021

QucsStudio Version 4.2.2 is available now. Besides many bugfixes, the new version exhibits the following new features:
  • Create user library from SPICE and SnP files
  • Markers in Smith charts can display impedance etc.
  • Font size independent from screen density
  • Ruler in layout editor with right mouse button
  • Drag'n'drop component into symbol editor
Once more, the biggest thanks to all who donate to this project. You made this release become reality!

New Forum

11th August 2020

A new forum as well as a new homepage with own domain is now available. Thanks a lot for this to Daniel Dieterle!
Please register and publish all new posts there. The old forum will still be reachable for some time.

Version 3.3.2 released

15th July 2020

QucsStudio version 3.3.2 is now available. Besides many new features (e.g. electromagnetic field simulator), many historical flaws were fixed. For example a single m as unit has not the meaning of milli anymore, i.e. now 3m = 3 and 3mm = 3e-3. Future versions will not be able to load old schematic files. Therefore, it's recommended to open all existing schematic and data display files with version 3.3.2 and save them afterwards. So within a project, select the files with mouse button and shift key, drag'n'drop them into the editor und press the Save all button.
The biggest thanks go to all who donate to this project, as you are the ones that made this version happen!

Forum online

5th September 2019

A forum for discussing QucsStudio topics is now available on the internet. Users can now register and talk about their problems, experiences and wishes.

New optimization examples uploaded

13th April 2019

The optimization package now contains many new example, available in the section examples.

New tutorials available

6th October 2018

Two new tutorials by Jose Manuel Campelo available in the section publications.

Version 2.5.7 released

14th July 2018

In order to celebrate the anniversary, QucsStudio version 2.5.7 is now available. Users can look forward to many new features. Furthermore, the examples were updated and new video links are located in the section screenshots.

15th anniversary

May 2018

15 years ago the Qucs project started. Congratulations on the birthday!

Support section added

1st August 2016

This homepage now contains a list with tasks that are needed for the development of this project. Everybody who wants to help is called to have a look into the support section.

Result of feature survey published

1st March 2016

The feature survey has just been closed. The result can be seen here.

New tutorials available

16th February 2016

A tutorial by Jose Manuel Campelo is now ready to download. Gunthard Kraus also upgraded his tutorial on his homepage.

Tutorial V1.6 available

14th December 2015

version 1.6 of the german tutorial by Gunthard Kraus available. It now contains a chapter about Harmonic Balance simulations.

Feature survey started

7th December 2015

A survey has just started to find new features for the future development of QucsStudio. Please click here and take part!

New homepage

30th November 2015

A completely new design for this homepage has been released. Hopefully you like it.

Tutorial V1.5 available

6th November 2015

version 1.5 of the tutorial by Gunthard Kraus available

Russian tutorial available

2nd November 2015

Russian version of Gunthard Kraus tutorial available. Many thanks to Vladimir Gololobov.


Tutorial available

25th February 2015

first version of the german tutorial by Gunthard Kraus available


10th anniversary

May 2013

10 years of Qucs development. Happy birthday!


First QucsStudio version released

1st February 2011

QucsStudio version 1.0.0 released

First Qucs version released

8th December 2003

Qucs version 0.0.1 released

Qucs development started

May 2003

The original Qucs project was born.