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Prefect vs Windmill

A side-by-side comparison of Prefect and Windmill across 26 workflow orchestration capabilities. Prefect fully supports 12 of them and Windmill fully supports 21; of the 12 mandatory features, Prefect covers 8 and Windmill covers 11.

Prefect

Prefect is a Python-native open-source workflow orchestration and automation tool, enabling you to author, schedule, and monitor data pipelines as code.

Features fully supported12 / 26
Mandatory features: 8 / 12View profile

Windmill

Windmill is an open-source developer platform and workflow engine that turns scripts in Python, TypeScript, Go, Bash, SQL and more into workflows, scheduled jobs, webhooks and internal apps.

Features fully supported21 / 26
Mandatory features: 11 / 12View profile

Feature comparison

13 of 26 capabilities differ between Prefect and Windmill.

Change tools
CapabilityPrefectWindmill
DAG-based workflow definition
Define dependencies and execution order
Mandatory		YesYes
Code-first workflows
Versionable, testable workflows
Mandatory		YesYes
Declarative workflow model
Predictability, reproducibility
Mandatory		PartialYes
Task dependency resolution
Correct execution order
Mandatory		YesYes
Persistent workflow state
Crash recovery, observability
Mandatory		YesYes
Task retries
Handle transient failures
Mandatory		YesYes
Retry policies (backoff, limits)
Avoid cascading failures
Recommended		PartialYes
Scheduling (cron / time-based)
Automated recurring workflows
Depends		YesYes
Event-driven execution
React to external systems
Depends		YesYes
Backfills / replays
Reprocess historical data
Depends		PartialNo
Idempotency support
Safe retries & replays
Mandatory		NoPartial
Exactly-once semantics
Correctness for business workflows
Optional		NoNo
Long-running workflows (days/months)
Business processes, approvals
Depends		PartialYes
Human-in-the-loop steps
Approvals, manual actions
Optional		PartialYes
Dynamic workflows at runtime
Conditional execution
Depends		YesYes
Workflow versioning
Safe evolution over time
Recommended		PartialYes
Distributed execution
Scalability
Mandatory		YesYes
High availability scheduler
Production reliability
Recommended		PartialYes
Fault-tolerant execution
Crash safety
Mandatory		PartialYes
Observability (logs, states, UI)
Debugging & ops
Mandatory		YesYes
Workflow-level visibility
Understand end-to-end runs
Mandatory		PartialYes
Task isolation
Failure containment
Mandatory		YesYes
Native Kubernetes support
Modern infra compatibility
Depends		PartialYes
Multi-language SDKs
Polyglot systems
Optional		NoYes
Deterministic replay
Safe recovery & correctness
Optional		NoNo
Pluggable execution backends
Flexibility
Recommended		YesPartial

* To be considered a complete workflow orchestration tool, a tool must implement the features marked as mandatory according to our assessment.

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Learn more

Read the full profiles, including pros and cons, installation and alternatives.

PrefectWindmill

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