Comparing
Async http client/server framework (asyncio)
Lightning-fast ASGI server for running async Python web apps (FastAPI, Starlette).
| Metric | aiohttp | uvicorn |
|---|---|---|
| Ecosystem | Python | Python |
| Difficulty | Beginner | Beginner |
| Weekly downloads | 0 | 7.2M↑ |
| Latest version | v3.13.5 | v0.30.6 |
| Recipes | 1 | 2↑ |
aiohttp only
Shared
uvicorn only
Use aiohttp when you need a battle-tested async HTTP client or server, especially in applications that make many concurrent HTTP calls (scrapers, API aggregators) or build lightweight async web services. It has a mature ecosystem and is widely used in production.
Running any ASGI framework: FastAPI, Starlette, Django Channels, Litestar. Development server with hot reload. Production with Gunicorn+uvicorn workers.
For new async API projects, FastAPI (built on Starlette/uvicorn) has better developer ergonomics, automatic validation, and docs. For synchronous scripts, requests is simpler. httpx offers a compatible API with both sync and async modes if you want flexibility.
WSGI apps (Flask, Django without Channels) — use gunicorn with sync workers instead.
aiohttp
uvicorn