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Prefect UI & Prefect Cloud

The Prefect UI provides an overview of all of your flows. It was designed around a simple question: what's the health of my system?

Prefect UI

There are two ways to access the UI:

  • Prefect Cloud is a hosted service that gives you observability over your flows, flow runs, and deployments, plus the ability to configure personal accounts, workspaces, and collaborators.
  • The Prefect UI is also available as an open source, locally hosted orchestration engine, API server, and UI, giving you insight into the flows running with any local Prefect server instance.

The Prefect UI displays many useful insights about your flow runs, including:

  • Flow run summaries
  • Deployed flow details
  • Scheduled flow runs
  • Warnings for late or failed runs
  • Task run details
  • Radar flow and task dependency visualizer
  • Logs

You can filter the information displayed in the UI by time, flow state, and tags.

Using the Prefect UI

The Prefect UI is available via Prefect Cloud by logging into your account at

The Prefect UI is also available in any environment where a Prefect server is running with prefect server start.

$ prefect server start

 ___ ___ ___ ___ ___ ___ _____ 
| _ \ _ \ __| __| __/ __|_   _|
|  _/   / _|| _|| _| (__  | |
|_| |_|_\___|_| |___\___| |_|

Configure Prefect to communicate with the server with:

    prefect config set PREFECT_API_URL=

Check out the dashboard at

When the Prefect server is running, you can access the Prefect UI at

Prefect UI

The following sections provide details about Prefect UI pages and visualizations:

  • Flow Runs page provides a high-level overview of your flow runs.
  • Flows provides an overview of specific flows tracked by by the API.
  • Deployments provides an overview of flow deployments that you've created on the API.
  • Work Pools enable you to create and manage work pools that distribute flow runs to agents.
  • Blocks enable you to create and manage configuration for blocks such as storage.
  • Notifications enable you to create and manage alerts based on flow run states and tags.
  • Task Run Concurrency Limits enable you to restrict the number of certain tasks that can run simultaneously.

Use the left side of the Prefect UI to navigate between pages.

Page Description
Flow Runs Displays the Flow Runs dashboard displaying flow run status for the current API server or Prefect Cloud workspace. From this dashboard you can create filters to display only certain flow runs, or click into details about specific flows or flow runs.
Flows Displays a searchable list of flows tracked by the API.
Deployments Displays flow deployments created on the API.
Work Pools Displays configured work pools and enables creating new work pools.
Blocks Displays a list of blocks configured on the API and enables configuring new blocks.
Notifications Displays a list of configured notifications and enables configuring new notifications.
Task Run Concurrency Displays a list of configured task run concurrency limits and enables configuring new limits.

In Prefect Cloud, the Prefect icon returns you to the workspaces list. Currently, you can create only one workspace per personal account, but you may have access to other workspaces as a collaborator. See the Prefect Cloud Workspaces documentation for details.

Prefect Cloud

Prefect Cloud provides a hosted server and UI instance for running and monitoring deployed flows. Prefect Cloud includes:

  • All of the features of the local Prefect UI.
  • A personal account and workspace.
  • API keys to sync deployments and flow runs with the Prefect Cloud API.
  • A hosted Prefect database that stores flow and task run history.

See the Prefect Cloud documentation for details about setting up accounts, workspaces, and API keys.

Prefect REST API

The Prefect REST API is used for communicating data from Prefect clients to Prefect Cloud or a local Prefect server so that orchestration can be performed. This API is mainly consumed by clients like the Prefect Python Client or the Prefect UI.

Prefect REST API interactive documentation

Prefect Cloud REST API documentation is available at

The Prefect REST API documentation for a local instance run with with prefect server start is available at http://localhost:4200/docs or the /docs endpoint of the PREFECT_API_URL you have configured to access the server.

The Prefect REST API documentation for locally run open-source Prefect servers is also available in the Prefect REST API Reference.