# Kludex/uvicorn

An ASGI web server, for Python. 🦄

Repository: https://github.com/Kludex/uvicorn
Canonical: https://ross.abutalabs.com/products/uvicorn
Homepage: https://uvicorn.dev
Language: Python
License: BSD-3-Clause
License Family: permissive
Topics: python, asyncio, asgi, http, http-server
Last push: 2026-08-24T13:03:17+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 99, release rhythm 98, longevity 100
- inputs: {"age_days": 3381, "days_push": 9, "days_rel": 14, "gap_med": 11, "n_releases_24m": 34}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 10927, forks 1021 (observed 2026-08-28T04:10:44.727052+00:00)

## What it is
Uvicorn is a lightning-fast ASGI web server implementation for Python, supporting HTTP/1.1 and WebSockets. It serves async Python frameworks via the ASGI specification and can be run from the command line or programmatically.

## Use cases
- serve an async Python web app
- run a FastAPI application in production
- host websockets connections in Python
- ASGI server for Starlette apps
- run python async http server with hot reload during development
- deploy python api behind nginx

## When to choose
- you need to serve an ASGI-compatible async Python framework like FastAPI or Starlette
- you need WebSocket or long-lived connection support in Python
- you want a fast, lightweight server with optional uvloop/httptools performance extras
- you need both CLI and programmatic server control

## When to avoid
- you are serving a traditional synchronous WSGI app like Flask or Django without ASGI
- you need a full-featured web server with built-in static file serving, auth, or reverse proxying
- you want a batteries-included framework rather than a server

## Facets
- artifact type: library
- maturity: stable
- function: http-server, websocket, cli, concurrency
- domain: web-development, backend, apis, developer-tools
- platform: python, cross-platform, cli
- tags: asgi, asyncio, uvloop, fastapi-server, production-server

## Member repositories
- Kludex/uvicorn (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:10:44.727052+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 2026-08-29T17:17:20.150661+00:00, confidence not recorded.
  - readme: https://github.com/Kludex/uvicorn (fetched 2026-08-28T04:10:44.727052+00:00, sha 177411fd26fd)
  - homepage: https://uvicorn.dev (fetched 2026-08-29T08:16:12.759592+00:00, sha 754b5c6e3588)
  - site_page: https://uvicorn.dev/installation (fetched 2026-08-29T08:16:12.768697+00:00, sha bd6ec805baeb)
  - registry_pypi: https://pypi.org/pypi/uvicorn/json (fetched 2026-08-29T08:16:12.774688+00:00, sha 57d08da8e3a2)
  - site_page: https://uvicorn.dev/settings (fetched 2026-08-29T08:16:12.770702+00:00, sha ab481e8e6ae9)
  - site_page: https://uvicorn.dev/deployment (fetched 2026-08-29T08:16:12.772570+00:00, sha eeb6ac4ee1c3)
- Data as of 2026-08-30T08:39:29.467469+00:00.