# lapce/floem

A native Rust UI library with fine-grained reactivity

Repository: https://github.com/lapce/floem
Canonical: https://ross.abutalabs.com/products/floem
Homepage: https://lap.dev/floem/
Language: Rust
License: MIT
License Family: permissive
Topics: native, rust, ui
Last push: 2026-06-21T21:54:13+00:00

## Health v2 (maintenance only)
Score: 61/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 88, release rhythm 8, longevity 93
- inputs: {"age_days": 1310, "days_push": 73, "days_rel": 657, "gap_med": null, "n_releases_24m": 1}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4249, forks 214 (observed 2026-08-28T04:08:40.397910+00:00)

## What it is
Floem is a native Rust UI library with fine-grained reactivity, inspired by Xilem, Leptos, and rui. It provides a declarative, ergonomic API for building high-performance cross-platform desktop applications with GPU or CPU rendering.

## Use cases
- build a native desktop app in Rust
- create a reactive GUI with fine-grained signals
- build a cross-platform UI toolkit application
- write a performant declarative UI in Rust
- build custom widgets with flexbox and grid layout
- create animated UI transitions in a Rust app

## When to choose
- you want a native Rust GUI with reactive signals and high performance
- you need cross-platform desktop support (Windows, macOS, Linux) with GPU or CPU rendering
- you prefer a declarative, ergonomic API inspired by Leptos-style reactivity
- you need Flexbox/Grid layout and customizable, themeable widgets

## When to avoid
- you need a fully stable, v1-guaranteed API — the project is still maturing with occasional breaking changes
- you want to target mobile or web platforms
- you need a large ecosystem of third-party widgets and mature tooling
- you prefer an immediate-mode or imperative UI model

## Facets
- artifact type: library
- maturity: active
- function: ui-components, frontend-framework, graphics, animation, state-management
- domain: cross-platform, desktop-applications, web-development, developer-tools
- platform: rust, windows, cross-platform
- tags: gui, reactive-signals, declarative-ui, wgpu, taffy, flexbox, native-ui, rust-ui, macos, linux, desktop

## Member repositories
- lapce/floem (main) score 61

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:40.397910+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 2026-08-29T18:22:11.574939+00:00, confidence not recorded.
  - readme: https://github.com/lapce/floem (fetched 2026-08-28T04:08:40.397910+00:00, sha 56d21bbe0b8f)
  - homepage: https://lap.dev/floem/ (fetched 2026-08-29T09:11:53.361930+00:00, sha bb68dab95983)
  - site_page: https://lap.dev/about (fetched 2026-08-29T09:11:53.371331+00:00, sha 5498b0a50418)
  - site_page: https://docs.lap.dev/ (fetched 2026-08-29T09:11:53.375866+00:00, sha 8e566dc6021f)
  - registry_crates: https://crates.io/api/v1/crates/floem (fetched 2026-08-29T09:11:53.377754+00:00, sha ac5ac8b2dae0)
  - site_page: https://lap.dev/pricing (fetched 2026-08-29T09:11:53.374030+00:00, sha a6c0e550bf44)
- Data as of 2026-08-30T08:39:29.467469+00:00.