# Qucs/qucs

Qucs Project official mirror

Repository: https://github.com/Qucs/qucs
Canonical: https://ross.abutalabs.com/products/qucs
Homepage: http://qucs.sourceforge.net/
Language: C++
License Family: other
Last push: 2026-03-25T09:10:21+00:00

## Health v2 (maintenance only)
Score: 66/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 74, release rhythm 35, longevity 100
- inputs: {"age_days": 4604, "days_push": 161, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1312, forks 225 (observed 2026-08-28T04:04:20.251061+00:00)

## What it is
Qucs (Quite Universal Circuit Simulator) is a GPL-licensed graphical circuit simulator with a Qt-based schematic capture GUI for simulating analog, RF, and digital circuits. This is the community-maintained mirror of the official project, now working toward interoperability with other simulators like Gnucap and NGSPICE.

## Use cases
- simulate analog circuits before building them
- design and verify RF and microwave circuits
- draw schematics and run AC/DC/S-parameter simulations
- teach electronics with a free circuit simulator
- simulate VHDL or Verilog digital designs alongside analog circuits
- synthesize filters and matching networks
- export netlists to SPICE simulators like NGSPICE

## When to choose
- you need a free, open-source alternative to commercial SPICE tools with a GUI
- you work with RF/microwave circuits needing S-parameter analysis
- you want schematic capture and simulation in one cross-platform tool
- you're teaching or learning circuit design on Linux, Windows, or macOS

## When to avoid
- you need industrial-grade, vendor-supported EDA with guaranteed model accuracy
- you only want a scriptable command-line simulator without a GUI
- you need PCB layout capabilities - Qucs is simulation only
- you require cutting-edge device models with commercial support contracts

## Facets
- artifact type: application
- maturity: active
- function: simulation, gui, graphics
- domain: simulation, hardware, education, cross-platform
- platform: windows, cpp, cross-platform
- tags: circuit-simulator, electronics, eda, spice, qt, schematic-capture, rf-design, linux, macos, desktop

## Member repositories
- Qucs/qucs (main) score 66

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:20.251061+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T04:48:56.953510+00:00, confidence not recorded.
  - readme: https://github.com/Qucs/qucs (fetched 2026-08-28T04:04:20.251061+00:00, sha 90d83f9cd393)
  - homepage: http://qucs.sourceforge.net/ (fetched 2026-08-29T12:07:38.126847+00:00, sha c116ba5fa662)
  - site_page: https://qucs.sourceforge.net/install.html (fetched 2026-08-29T12:07:38.136345+00:00, sha 79d6f6ad914c)
  - site_page: https://qucs.sourceforge.net/devs.html (fetched 2026-08-29T12:07:38.138091+00:00, sha 5bd4c7ce1c92)
- Data as of 2026-08-30T08:39:29.467469+00:00.