Heym vs Windmill
Compare Heym and Windmill for code-first workflows, agents, and internal operations.
Last reviewed August 7, 2026
Where Windmill can fit well
Windmill can be a strong fit for developer-led teams that want scripts, internal apps, and workflow orchestration in a code-first platform.
When to evaluate Heym
Evaluate Heym when teams want a visual AI-first builder for agents, RAG, human checkpoints, evals, dashboards, MCP, and workflow inspection without centering the implementation on scripts.
Product context
What Windmill documents
Windmill documents AI agent steps that can call scripts as tools, plus script- and code-oriented workflows with job logs and checkpoint-based orchestration.
Decision table
Deployment, pricing, and AI workflow controls
The first three rows are a snapshot of publicly documented deployment and pricing information. The remaining rows show the Heym controls worth testing in any real evaluation; they are trial questions, not claims that Windmill lacks a capability.
| Decision point | Heym | Windmill |
|---|---|---|
| Open-source / source model | Source-available | Open source (AGPLv3) Windmill identifies its open-source edition as AGPLv3 and offers a commercial Enterprise license. Windmill licensing |
| Self-hosted deployment | Yes — deploy on infrastructure you control | Yes Windmill lists self-hosted deployment on Fargate, Docker, and Kubernetes. Windmill pricing |
| Published entry price | Contact Heym for current commercial terms | Free OSS; Enterprise from $120/month Enterprise pricing is configured by seats and compute units, so the published total varies by setup. Windmill pricing |
| Agent orchestration | Visual tool-calling agents, named sub-agents, and composable sub-workflows. | Can agents delegate to specialist agents and workflow tools with clear execution boundaries? |
| RAG and retrieval | Built-in document ingestion, vector retrieval, metadata filters, and reranking. | What is native, what depends on an external vector store, and how are data access controls enforced? |
| MCP connectivity | Use MCP tool servers from agents or expose Heym workflows as an MCP server. | Does the product support the required MCP client, server, authentication, and audit patterns? |
| Human review and guardrails | Approval checkpoints with shareable review links, configurable guardrails, and editable reviewer input. | Can a workflow pause for an accountable reviewer and record its approval, edit, or refusal? |
| Evaluation suites | Test cases, model comparisons, pass/fail tracking, and LLM-as-judge scoring for AI workflows. | Can teams regression-test an AI workflow before changing a model, prompt, tool, or knowledge base? |
| LLM traces and telemetry | Full invocation context, tool calls, timing, skills, OpenTelemetry export, and token-cost visibility. | Can operators inspect the necessary request, response, tool, latency, and cost evidence for a production run? |
| Workflow analysis and dashboards | Run-aware workflow analysis plus customizable dashboard widgets powered by hidden workflows. | Are analysis reports and operational dashboards native, configurable, and connected to the workflow data you need? |
| Reusable agent skills | Portable SKILL.md capability bundles with optional tools that can be attached to agents. | Can teams package, govern, and reuse agent instructions and tools across workflows? |
| Runtime execution | Parallel DAG execution runs independent workflow nodes concurrently when their dependencies are ready. | How does the runtime schedule parallel branches, retries, long-running work, and failure handling? |
Prices, licensing, and availability can vary by region, billing interval, usage, edition, and negotiated terms. Check the linked vendor source before a purchase or deployment decision.
See the full Heym capability comparisonResearch and fair-use note
This Heym comparison is based on publicly available vendor material reviewed on August 7, 2026. It is not an endorsement or a claim of affiliation. Product names are used only to identify the products discussed, and all third-party trademarks belong to their respective owners. Capabilities, plans, pricing, and deployment options can change; verify them directly with the vendor.
Frequently asked questions
Can Windmill agents call scripts as tools?
Windmill documents AI agent steps with script tools. The linked documentation explains the supported tool sources and configuration model.
How should teams use this comparison?
Use it as a starting point for a product evaluation, then validate the workflow, deployment, security, integration, and pricing requirements that apply to your own environment.
How current is the research?
This page was last reviewed on August 7, 2026. Product capabilities, plans, and deployment options can change, so the linked official documentation is the source of record.
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