Software · 3D, CAD & electronics

Qucs-S

Quite universal circuit simulator with SPICE.

Completely free
Windows and Linux
Open source
No account

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Geographic availability: No geographic restriction found in our sources; availability is not checked country by country.

Technical details

Pricing: Completely freeconfirmed by Flathub, Winget (Windows Package Manager)
License: GPL-2.0+ — Open source (copyleft)confirmed by Flathub, Winget (Windows Package Manager)
Open source: Yes
Commercial use: Yesconfirmed by Flathub, Official plan pages (pricing, licence, terms), Winget (Windows Package Manager)
Account required: Noconfirmed by Winget (Windows Package Manager)
Credit card required: Noconfirmed by Flathub, Winget (Windows Package Manager)
Watermark: not documented
Ads: not documented
Platforms: Windows and LinuxEstablished by Linux: Flathub · Windows: Winget
Publisher: Vadim Kuznetsov
Latest version: 26.1.1 (26 April 2026)
Latest activity: 28 August 2026
Source code: github.com/ra3xdh/qucs_s

Overview

Qucs-S is an electronics design program, available on Windows and Linux.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“Quite universal circuit simulator with SPICE” — Flathub, 10 November 2026

At a glance

All of Qucs-S is free: no feature is locked behind a paid plan, and its code is open.

Its licence (GPL-2.0+) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
Commercial use allowed

About

Qucs-S provides a fancy graphical user interface for a number of popular circuit simulation engines. Qucs-S contains instruments for schematic capture, visualization and provides differents passive and active components including device library.

Description from Flathub — AppStream (Flathub)

Sources and checks

Facts collected from Flathub (credit card, source code, publisher, licence, free status, platforms, commercial use, version) — 9 November 2026
Facts collected from Official plan pages (pricing, licence, terms) (commercial use) — 8 November 2026
Facts collected from Winget (Windows Package Manager) (credit card, account, source code, publisher, licence, free status, platforms, commercial use, version) — 7 November 2026
Last technical check: 6 November 2026
Description from Flathub — AppStream (Flathub)

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