# pydantic/FastUI

Build better UIs faster.

Repository: https://github.com/pydantic/FastUI
Canonical: https://ross.abutalabs.com/products/fastui
Homepage: https://fastui-demo.onrender.com
Language: Python
License: MIT
License Family: permissive
Topics: fastapi, pydantic, python, react
Archived: true
Last push: 2026-04-01T04:52:34+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 75, release rhythm 42, longevity 77
- inputs: {"age_days": 1080, "days_push": 154, "days_rel": 309, "gap_med": 55, "n_releases_24m": 2}
- flags: archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 8956, forks 338 (observed 2026-08-28T04:10:26.480608+00:00)

## What it is
FastUI is a framework for building web application UIs with declarative Python code, backed by matching Pydantic models and TypeScript interfaces rendered by a React frontend. It lets Python developers build responsive React-based apps without writing JavaScript, with optional prebuilt components served via CDN.

## Use cases
- build a web UI from Python without writing JavaScript
- create admin dashboards with FastAPI and React
- define frontend components declaratively with Pydantic models
- serve a React app from a Python backend without npm
- build CRUD interfaces quickly for Python web apps

## When to choose
- you are a Python developer who wants a React UI without touching JavaScript or npm
- you use FastAPI or Pydantic and want tight backend-driven UI definitions
- you want a prebuilt React frontend served straight from a Python package

## When to avoid
- you need an actively maintained project - it is marked inactive by its maintainers
- you need highly custom frontend behavior beyond the provided component model
- your team prefers owning the full frontend codebase in TypeScript

## Facets
- artifact type: framework
- maturity: abandoned
- function: frontend-framework, ui-components, web-framework, templating
- domain: web-development, frontend, developer-tools
- platform: python, cross-platform
- tags: react, pydantic, fastapi, declarative-ui, no-javascript, bootstrap, nodejs, web-server

## Member repositories
- pydantic/FastUI (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:26.480608+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 2026-08-29T17:24:28.140815+00:00, confidence not recorded.
  - readme: https://github.com/pydantic/FastUI (fetched 2026-08-28T04:10:26.480608+00:00, sha f39004791bb1)
  - registry_pypi: https://pypi.org/pypi/fastui/json (fetched 2026-08-29T08:24:37.128402+00:00, sha ef0311d6c0d0)
- Data as of 2026-08-30T08:39:29.467469+00:00.