Act vs Ansible

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.

Ansible is an open-source IT automation platform developed by Red Hat for configuration management, application deployment, and infrastructure orchestration. It uses agentless architecture connecting over SSH and describes automation in YAML-based playbooks. Ansible is available as a free community project or as the commercial Ansible Automation Platform from Red Hat.