# JFormDesigner/FlatLaf

FlatLaf - Swing Look and Feel (with Darcula/IntelliJ themes support)

Repository: https://github.com/JFormDesigner/FlatLaf
Canonical: https://ross.abutalabs.com/products/flatlaf
Homepage: https://www.formdev.com/flatlaf/
Language: Java
License: Apache-2.0
License Family: permissive
Topics: look-and-feel, swing, java-swing, flatlaf
Last push: 2026-08-25T17:43:16+00:00

## Health v2 (maintenance only)
Score: 88/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 68, longevity 100
- inputs: {"age_days": 2571, "days_push": 8, "days_rel": 55, "gap_med": 90.5, "n_releases_24m": 9}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4262, forks 329 (observed 2026-08-28T04:08:40.630481+00:00)

## What it is
FlatLaf is a modern, open-source, cross-platform Look and Feel library for Java Swing desktop applications with a clean, flat design. It ships Light, Dark, IntelliJ, and Darcula themes, supports IntelliJ Platform third-party themes, HiDPI scaling, and runs on Java 8 or newer.

## Use cases
- give my Java Swing app a modern flat dark theme
- make a Swing UI look like IntelliJ IDEA Darcula
- use IntelliJ Platform themes in a desktop Java application
- fix blurry Swing UI on HiDPI displays
- add macOS-style light and dark themes to a Java desktop app
- customize fonts and colors of a Swing look and feel

## When to choose
- building or modernizing a Java Swing desktop application
- you want IntelliJ/Darcula-like appearance in Swing
- you need HiDPI scaling and cross-platform consistency on Java 8+

## When to avoid
- building JavaFX, web, or non-Java applications
- you need a native OS widget look rather than a flat custom theme

## Facets
- artifact type: library
- maturity: stable
- function: ui-components, theme
- domain: desktop-applications, cross-platform, web-design
- platform: cross-platform, jvm, windows
- tags: swing, look-and-feel, java, flat-design, darcula, intellij-themes, hidpi, desktop, macos, linux

## Member repositories
- JFormDesigner/FlatLaf (main) score 88

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:40.630481+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 2026-08-29T18:22:04.725488+00:00, confidence not recorded.
  - readme: https://github.com/JFormDesigner/FlatLaf (fetched 2026-08-28T04:08:40.630481+00:00, sha 613ff95d4d91)
  - homepage: https://www.formdev.com/flatlaf/ (fetched 2026-08-29T09:11:50.457879+00:00, sha b596629c63bc)
- Data as of 2026-08-30T08:39:29.467469+00:00.