Act vs Apache Airflow

act is an open-source command-line tool that runs GitHub Actions workflows locally using Docker containers. It reads workflow files from .github/workflows/ and executes them with environment variables and filesystem configurations matching GitHub's hosted runners. The tool enables fast local feedback on workflow changes without requiring commits and pushes to a remote repository.

Apache Airflow is an open-source workflow orchestration platform for programmatically authoring, scheduling, and monitoring data pipelines. Workflows are defined as directed acyclic graphs (DAGs) in Python, with a web-based UI for monitoring and management. Airflow is widely used for ETL/ELT workflows, ML pipelines, and data engineering tasks.