Latest News

Latest stable release: 0.0.19
Windows Ubuntu OS X
Official SourceForge repository
GitHub Mirror
Qucs Wiki

22 January 2017 Released Qucs 0.0.19, News
18 September 2015 Publication "Qucs: An introduction to the new simulation and compact device modelling features implemented in release 0.0.19/0.0.19Src2 of the popular GPL circuit simulator.", 13th MOS-AK Workshop, Graz (A).
The presentation slides by Mike Brinson are available online.
19 January 2015 Enabled automatic generation and deployment of Doxygen source code documentation.
Latest documentation for "master" branch available for Qucs GUI and Qucs Core
07 January 2015 Enabled Linux and OSX builds on Travis CI, enabled code coverage with Coveralls
17 September 2014 Released installer fo Mac OSX 10.6 (Intel 64 bit) (ASCO included).
02 September 2014 Updated package for Ubuntu 14.04 (Trusty) and 14.10 (Utopic), Ubuntu PPA
01 September 2014 Updated Doxygen code documentation
01 September 2014 Released Mac OSX installer (10.7 to 10.9), ASCO included.
For FreeHDL, Verilog-A, users are better served using a package manager for Mac OSX
31 August 2014 Released Qucs 0.0.18, News
04 April 2014 Updated build instruction for Darwin (Mac OSX), Linux , Windows
16 March 2014 Updated manuals, developers and FAQ webpages
28 November 2013 Created GitHub repository for the Qucs website.
03 July 2013 New implementation of matrix calculations using Libeigen3. Files are in branch local_complex_20130624
03 July 2013 Added option for changing the home directory and other paths using QSettings (~/.qucs/qucsrc is now obsolete)
23 June 2013 Released Qucs 0.0.17
14 June 2013 Added BSIM 4.30 nMOS and pMOS models
20 May 2013 Added BSIM 3.34 nMOS and pMOS models
26 April 2013 Added beginnings of m-code transient solver interface.

Previous news items

What's Qucs?

Qucs stands for Quite Universal Circuit Simulator. So far Qucs is not yet finished, but it is already packed with features. Take a look at the screenshots to get a feel for what it can do.

Qucs is an integrated circuit simulator which means you are able to setup a circuit with a graphical user interface (GUI) and simulate the large-signal, small-signal and noise behaviour of the circuit. After that simulation has finished you can view the simulation results on a presentation page or window.

The Qucs GUI is well advanced and allows setting up schematics and presenting simulation results in various types of diagrams. DC, AC, S-parameter, noise and transient analysis is possible, mathematical equations and use of a subcircuit hierarchy (with parameterised subcircuits) are available. Qucs can also import existing SPICE models for use in your simulations.

While Qucs is well developed, we still strive to improve the project, and will always welcome offers of help. Qucs doesn't just need help with programming, it also needs graphics, high quality example schematics, tutorials for the website and lots more.

Qucs comes with an array of components and models. Third party models including HICUM, BSIM2, BSIM3 and BSIM6 can be compiled and loaded into the simulator. It also provides many semiconductor based components and models such as OpAmps, Diodes, MOSFETs, PMOSFETs and many more. Some example schematics can be found here which demonstrate some of the abilities of Qucs, and many more examples are provided with the program.

Operating Systems

Qucs is currently developed under the GNU/Linux OS using the standard autotools with no special effort to support other operating systems. However Qucs is said to be successfully compiled and run on Windows, Solaris, NetBSD, FreeBSD, macOS, Cygwin... help is needed!


Qucs is released under the GPL license and so it is free for free programmers and users!


Qt® is a registered trademark of Digia.

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