Windmill review

Windmill is an open-source, code-first platform for building and running scripts, workflows, apps, data pipelines and AI agents. You can use its cloud service or self-host it, with Git-based collaboration and deployment controls. The pitch is to keep custom code and operational automation in one place rather than assemble them from separate tools.

Scripts written in 20+ languages can become API endpoints and forms. Workflows can be built visually or in Python and TypeScript, with retries, approvals and parallel branches. Windmill also supports custom React or Svelte apps backed by scripts and workflows, plus agents that run on 12 providers or on a model behind an OpenAI-compatible endpoint.

For deployment, the product description lists review, staging-to-production promotion and rollback. Run details include inputs, results, logs, traces, metrics and audit records. That makes Windmill a better fit for teams comfortable owning code and execution infrastructure than for buyers looking for a no-code automation tool.

Windmill’s main advantage is that it connects code, workflow orchestration and internal app-building without limiting scripts to one language. Teams can turn existing scripts into APIs and forms, then arrange them into workflows with retries, approvals and parallel branches. The editor supports visual workflows as well as Python and TypeScript, so a team can choose between a diagram and code for the same general job.

Its deployment controls are useful for teams that need changes reviewed before they reach production. The product description lists Git-based collaboration, staging-to-production deployment and rollback. Run observability covers inputs, results, logs, traces, metrics and audit records, giving operators more to inspect when a run fails than a simple success-or-failure status.

The free and open-source plan is a practical way to evaluate or self-host the platform: the pricing page lists unlimited executions, three workspaces, a maximum of 50 users and 10 GiB of object storage at $0 per month. It also includes 100 guest users per 30 days. For teams willing to operate the stack themselves, those published limits make the starting cost clear.

The biggest pricing problem is that the bill above the free tier is hard to estimate from the published details. The pricing page lists Enterprise starting at $120 per month, but does not publish prices for Pro or Nonprofit, and annual billing is offered without an annual price or equivalent shown. Teams is billed on actual usage, but the published pricing details do not give a rate.

Seat and worker charges can add up: builders are listed at $20 per month each, non-builders and external JWT users at $10 each, and workers at $50 per worker per month in the listed configuration. Eight native subworkers are listed at $50 per month in that configuration. The first 100 guests per 30 days are free; above that, four guests count as one seat. Check which categories apply to your setup before comparing Windmill with a fixed-price alternative.

The free plan’s 50-user maximum and three-workspace limit may also constrain a growing team. Enterprise adds audit logs, SAML with group synchronization, a distributed dependency cache backed by S3, and 24/7 priority support with a three-hour response. The pricing page lists a one-month free trial, but does not publish the missing plan prices.

Windmill’s Free and Open-source plan is $0/month. It includes unlimited executions, 3 workspaces, up to 50 users, 100 guest users per 30 days and 10 GiB of object storage. The pricing page lists Enterprise from $120/month, so the gap from free is substantial—but Pro, Nonprofit and Teams prices are not published on the vendor's site. Don’t treat $120 as a full team quote: add-ons include Builders at $20/month each, non-builders and external JWT users at $10/month each, and workers at $50 per worker/month in the listed configuration. Eight native subworkers are listed at $50/month in that configuration. The first 100 guests per 30 days are free; above that, every 4 guests count as 1 seat. A one-month free trial is offered. Monthly and annual billing are available, but annual prices or savings are not published. Price the seats and worker setup before upgrading.

Windmill is a better fit for teams willing to work in code than for buyers looking to move a no-code automation setup unchanged. The product supports scripts in 20+ languages, workflows built visually or in Python and TypeScript, and custom React or Svelte apps. That gives technical teams several ways to rebuild existing automation, but the published material does not quantify migration effort or document a data-export process. Check how your scripts, workflow definitions and run records can be exported before you commit; run inputs, results, logs, traces, metrics and audit records are inspectable, but export options are not specified here. Git-based review, staging, production deployment and rollback may suit teams already using Git workflows. Self-hosting is an option, but it does not by itself establish portability. The published published material includes no Reddit posts, so we can’t attribute common reasons for leaving to Reddit users.