# ra3xdh/qucs_s

Qucs-S is a circuit simulation program with Qt-based GUI

Repository: https://github.com/ra3xdh/qucs_s
Canonical: https://ross.abutalabs.com/products/qucs_s
Homepage: https://ra3xdh.github.io/
Language: C++
License: GPL-2.0
License Family: copyleft
Topics: electronics, circuit, simulation, modelling, ngspice, xyce, qt, qt5, qt6
Last push: 2026-08-18T06:20:06+00:00

## Health v2 (maintenance only)
Score: 92/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 98, release rhythm 81, longevity 100
- inputs: {"age_days": 3349, "days_push": 15, "days_rel": 129, "gap_med": 24, "n_releases_24m": 10}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1356, forks 166 (observed 2026-08-28T04:04:29.365622+00:00)

## What it is
Qucs-S is an open-source circuit simulation program with a Qt-based graphical user interface for schematic capture and visualization. It acts as a frontend for multiple SPICE simulation kernels including Ngspice, Xyce, SpiceOpus, and Qucsator.

## Use cases
- simulate electronic circuits with a GUI
- draw schematics and run SPICE simulations
- simulate circuits using ngspice or Xyce
- free alternative to commercial circuit simulators
- teach electronics circuit analysis
- model analog and RF circuits

## When to choose
- you want a graphical schematic capture tool backed by real SPICE kernels
- you need cross-platform circuit simulation on Linux, Windows, or macOS
- you prefer open-source EDA tooling with active development

## When to avoid
- you need automated batch simulation without a GUI
- you require PCB layout or full EDA suite features
- you need vendor-accurate models for specific commercial ICs

## Facets
- artifact type: application
- maturity: active
- function: simulation, gui, graphics
- domain: simulation, hardware, education, cross-platform
- platform: windows, cpp
- tags: circuit-simulator, spice, ngspice, xyce, schematic-capture, electronics, eda, qt6, linux, macos, desktop, qt

## Member repositories
- ra3xdh/qucs_s (main) score 92

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:04:29.365622+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 2026-08-30T04:41:55.862579+00:00, confidence not recorded.
  - readme: https://github.com/ra3xdh/qucs_s (fetched 2026-08-28T04:04:29.365622+00:00, sha 1c70166ea6cc)
  - homepage: https://ra3xdh.github.io/ (fetched 2026-08-29T12:00:10.362311+00:00, sha e4a06e619151)
- Data as of 2026-08-30T08:39:29.467469+00:00.