Windmill

Windmill is an open-source developer platform for building internal tools, APIs, background jobs, and workflows by turning scripts into reusable building blocks. It provides auto-generated UIs, webhooks, and scheduling so teams can ship operational automation and apps quickly while keeping execution and access control on their own infrastructure.

Key Features

• Turn scripts into APIs, webhooks, scheduled jobs, and shareable auto-generated UIs
• Low-code workflow editor to compose scripts into multi-step flows
• App builder for creating richer internal UIs on top of scripts and workflows
• Multi-language script support (notably Python, TypeScript, Go, Bash, SQL, and GraphQL)
• Built-in secrets/variables management with workspace-level encryption for stored credentials
• Sandboxed execution using nsjail for stronger isolation in multi-tenant deployments
• Git-based development workflows via CLI and repository synchronization
• PostgreSQL-backed job orchestration with stateless API and scalable workers

Use Cases

• Building internal tools (admin panels, ops dashboards, backoffice utilities)
• Automating operational workflows (scheduled maintenance tasks, data syncs, incident runbooks)
• Exposing controlled internal APIs and webhooks backed by scripts

Limitations and Considerations

• Some distribution binaries/images may include non-open components; fully open-source builds come from compiling the repository sources
• Community Edition includes limits on certain enterprise features (for example, SSO user limits)

Windmill fits teams that want a script-first approach to internal tooling and automation with a fast workflow engine and a built-in UI layer. It combines developer-friendly coding with low-code composition to scale from quick scripts to production-grade orchestrated workflows.