Heaven ⚡ :

Heaven is the absolute minimal, insanely fast ASGI web framework for Python purists. It doesn't just get out of your way; it vanishes, leaving you with raw performance and total control.

"Mastery in 30 minutes or less. No grey spots, just pure Python."

Why Heaven?

Feature	Heaven	FastAPI	Flask	Django
Learning Curve	30 Mins	High	Low	Extreme
Throughput (measured)	12,517 req/s	6,223 req/s	1,190 req/s	1,784 req/s
Boilerplate	Zero	Medium	Low	Massive
Mastery	Complete	Partial	High	Low
Background Jobs	Native (Daemons)	External	External	External

Stupid Simple: Built for engineers who hate bloat. If you know Python, you already know Heaven.
Blazing Fast: A thin layer over ASGI, optimized for high-concurrency and low-latency.
Batteries Included (The right ones): Native support for application mounting, centralized hooks (.BEFORE/.AFTER), and powerful background Daemons.
Transparent: No magic decorators that hide logic. Just clear, explicit routing.

Performance

Hello-world JSON throughput, one worker process each, default out-of-the-box configuration, generated by the script checked in at benchmarks/compare.py:

Framework	Served by	Requests/sec	Relative
Heaven 2.0.0	uvicorn	12,517	1.00x
FastAPI 0.141.1	uvicorn	6,223	0.50x
Django 6.0.7 (ASGI)	uvicorn	1,784	0.14x
Flask 3.1.3	gunicorn	1,190	0.10x

Roughly 2x FastAPI, 7x Django and 10x Flask, measured on the same box: an Intel i5-8350U laptop, Python 3.12, 48 keep-alive connections, median of three 5 second rounds. ASGI apps run under uvicorn[standard], Flask runs under gunicorn's default sync worker. Absolute numbers are hardware-dependent, so reproduce them on yours before quoting:

pip install heaven fastapi flask django 'uvicorn[standard]' gunicorn
python benchmarks/compare.py

Quickstart in 60 Seconds

Install

$ pip install heaven

Code

from heaven import App, Request, Response, Context

app = App()

# Centralized Auth / Pre-processing
async def auth(req, res, ctx):
    if not req.headers.get('Authorization'):
        res.status = 401
        res.abort('Unauthorized')

app.BEFORE('/api/*', auth)

# Simple Handler
async def welcome(req, res, ctx):
    res.body = {"message": "Welcome to Heaven"}

app.GET('/api/v1/welcome', welcome)

Prefer grouping routes by subject? Register a method with Class#method:

# controllers/orders.py
from heaven import Handler

class Orders(Handler):
    async def index(self):
        self.res.body = await self.req.app.peek('db').orders()

app.GET('/orders', 'controllers.orders.Orders#index')

self.req, self.res and self.ctx are the same three objects, and Heaven builds one instance per request so self is never shared.

Protect (Automatic OpenAPI)

from typing import Annotated, TypedDict

class User(TypedDict):
    name: Annotated[str, 'min_len=2']

app.schema.POST('/user', expects=User, summary="Create User")
app.DOCS('/docs')

Fly (CLI) Heaven comes with a beautiful, zero-config CLI.

pip install heaven

# Auto-discovery & run with reload
heaven fly

# Visualize your API structure
heaven routes

Daemon (Background)

async def pulse(app):
    print("Heartbeat...")
    return 5 # Run every 5 seconds

app.daemons = pulse

Run (Standard)

$ uvicorn app:app --reload

Full Documentation: https://rayattack.github.io/heaven
PyPi: https://pypi.org/project/heaven
Source: Github

Contributing

We love builders. See the Contribution Guidelines.

Metadata

Release files for heaven 2.1.0

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for heaven 2.1.0
File	Size	Uploaded
heaven-2.1.0.tar.gz	63.9 kB	Aug 14, 2026	Details

Built distribution (wheel)

Table of built distributions (wheels) for heaven 2.1.0
File	Interpreter	ABI	Platform	Reset
heaven-2.1.0-py3-none-any.whl 70.5 kB Aug 14, 2026	Python 3	none	any	Details

Total release size: 134.4 kB

Release files / heaven-2.1.0.tar.gz

Download URL	heaven-2.1.0.tar.gz
Size	63.9 kB
Tags	Source
SHA-256 checksum How to use checksums	`3faaf781708faa0493b3c48c4cb24a0bfd071fd3cc5110d47d5dd7f21b3e3279`
BLAKE2b-256 checksum How to use checksums	`626901ea1cb9e74df5049695215b63248bb481380eedfc1d27be4b8b56c0d61b`
Upload date	Aug 14, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`poetry/2.1.3 CPython/3.12.3 Linux/7.0.0-28-generic`

Release files / heaven-2.1.0-py3-none-any.whl

Download URL	heaven-2.1.0-py3-none-any.whl
Size	70.5 kB
Tags	Python 3
SHA-256 checksum How to use checksums	`cc3a47418e3ec2da09a5a398f66145f62770d7be43c5063b7b83446170762a57`
BLAKE2b-256 checksum How to use checksums	`54ca8f2df05ca9b078a78a8409dcb9c934b3e624d98320ae43632baa5dfd84d5`
Upload date	Aug 14, 2026
Uploaded using Trusted Publishing? What is trusted publishing?	No
Uploaded via	`poetry/2.1.3 CPython/3.12.3 Linux/7.0.0-28-generic`