# KLayout/klayout

KLayout Main Sources

Repository: https://github.com/KLayout/klayout
Canonical: https://ross.abutalabs.com/products/klayout
Homepage: http://www.klayout.org
Language: C++
License: GPL-3.0
License Family: copyleft
Topics: klayout, qt, eda, gds2
Last push: 2026-08-26T17:09:27+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 87, longevity 100
- inputs: {"age_days": 3489, "days_push": 7, "days_rel": 7, "gap_med": 36, "n_releases_24m": 20}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1182, forks 297 (observed 2026-08-28T04:03:54.334246+00:00)

## What it is
KLayout is an open-source Qt-based viewer and editor for IC mask layouts, supporting formats like GDS2 and OASIS. It includes Ruby and Python scripting with optional Qt bindings for automation and custom UIs.

## Use cases
- view gds2 layout files
- edit ic mask layouts
- convert gds2 to oasis
- automate layout processing with python scripts
- inspect chip design geometry
- drc and layout verification workflows

## When to choose
- you need a free cross-platform GDS2/OASIS viewer and editor
- you want scriptable layout processing via Ruby or Python
- you work in EDA/IC design without commercial tool licenses

## When to avoid
- you need a full commercial EDA flow with signoff DRC/LVS
- you only need lightweight command-line format conversion without a GUI
- you require non-GPL licensing for redistribution

## Facets
- artifact type: application
- maturity: active
- function: gui, image-processing, developer-tools, plugin-system, parser
- domain: hardware, developer-tools, cross-platform
- platform: windows, cpp, python
- tags: eda, gds2, layout-viewer, ic-design, qt, mask-layout, oasis, linux, macos, desktop

## Member repositories
- KLayout/klayout (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:54.334246+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 2026-08-30T06:24:46.020588+00:00, confidence not recorded.
  - readme: https://github.com/KLayout/klayout (fetched 2026-08-28T04:03:54.334246+00:00, sha 0c245054d145)
  - homepage: http://www.klayout.org (fetched 2026-08-29T12:31:37.528774+00:00, sha 26f3ebe11453)
- Data as of 2026-08-30T08:39:29.467469+00:00.