Google Opal is free, with no paid plan attached. Windmill is free, with no paid plan attached. Both are listed under Workflow Automation, so this is a like-for-like comparison. Neither is ranked above the other — Flocci carries no sponsored placement.
Google Opal is free, with no paid plan attached and is listed for describe an app in plain language and Opal builds a shareable multi-step AI workflow. Windmill is free, with no paid plan attached and is listed for open-source, self-hostable with unlimited executions on the free tier. Both sit in Workflow Automation.
Neither — Google Opal and Windmill are both free, so the choice comes down to capability rather than cost. Both entries list what they uniquely do above.
Choose Google Opal if you need describe an app in plain language and Opal builds a shareable multi-step AI workflow; choose Windmill if you need open-source, self-hostable with unlimited executions on the free tier. Flocci AI Tools does not rank one above the other — it shows both feature sets side by side and lets the requirement decide.
| Google Opal | Windmill | |
|---|---|---|
| Pricing tier | Free | Free |
| Free to start | Yes | Yes |
| Category | AI Agents & Automation | AI Agents & Automation |
| Type | Workflow Automation | Workflow Automation |
| Listed capabilities |
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| Tags | google opal, no code ai mini apps, free ai workflow builder, opal agent step, vibe code workflows | open source workflow engine, internal tools builder, scripts to apps, self hosted automation, developer workflow platform, free |
| Website | opal.google | windmill.dev |
| Full page | Google Opal details → | Windmill details → |
| Alternatives | Google Opal alternatives → | Windmill alternatives → |