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Modern Workflow Orchestration

Prefect is the modern Airflow replacement for building,
observing, and reacting to your workflows.

Read the docs
See the code
Open Source

Host your own server, or pair OSS workflows with Prefect Cloud

Dynamic Workflows

Discover workflows at runtime, no DAGs required

Build Resilient Pipelines

Scheduling, retries, scaling, concurrency, and more

Lightweight

Start a local development server with a single command

Pure Python

You bring raw Python functions, Prefect handles the rest

Take a Tour of How Prefect Visualizes Python Workflows

No DAG Required

Dynamic workflows

Prefect discovers your workflows at runtime so you can write the code you want, without conforming to a constrictive domain-specific language.

alt
main.py
1from prefect import flow, task
2
3@task
4def add_one(x: int):
5    return x + 1
6
7@flow
8def main():
9    for x in [1, 2, 3]:
10        first = add_one(x)
11        second = add_one(first)
Apache v2.0 License

Open-source flexibility

Host your own open-source Prefect server, or take advantage of high availability, security, advanced features, and better performance with Prefect Cloud.

prefect server start

Lightweight

Spin up your own orchestration server for development with one command.

This makes local development a breeze, with seamless deployment to production.

alt
$ prefect server start
 ___ ___ ___ ___ ___ ___ _____ 
| _ \ _ \ __| __| __/ __|_   _| 
|  _/   / _|| _|| _| (__  | |  
|_| |_|_\___|_| |___\___| |_|  

Configure Prefect to communicate with the server with:

    prefect config set PREFECT_API_URL=http://127.0.0.1:4200/api

View the API reference documentation at http://127.0.0.1:4200/docs

Check out the dashboard at http://127.0.0.1:4200
Code as workflows

Pure Python

Start orchestrating with a single decorator, and take your workflow to production without building unnecessary abstractions.

alt
1from prefect import flow
2
3@flow
4def my_favorite_function():
5    print("What is your favorite number?")
6    return 42
7
8print(my_favorite_function())
$ python hello_prefect.py
15:27:42.543 | INFO    | prefect.engine - Created flow run 
   for flow 'my-favorite-function'
What is your favorite number?
15:27:42.652 | INFO    | Finished in state Completed()
42
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