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Automation Integration · head to head

Inngest vs Windmill

Inngest logo

Inngest

Automation Integration

Unbreakable Agents. Invisible Infra.

From
Free
Rated
-
Full reviewWebsite
Windmill logo

Windmill

Automation Integration

Open-source developer platform for building scripts, workflows, and internal apps

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Inngest hobby plans pause execution once free quota exhausted; upgrade required to continue; Windmill free self-hosted tier caps SSO users at 10 and workspaces at 3, requiring Enterprise for larger teams.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which Inngest and Windmill actually diverge.

Attributes where Inngest and Windmill differ
AttributeInngestWindmill
Pricing modelfreemiumopen-source
PlatformsWebweb, api, linux, windows, mac

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Automation Integration).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in Inngest

Nothing recorded that Windmill does not also cover.

Only in Windmill

  • Script-to-workflow engine
  • Auto-generated UIs
  • Self-hosted deployment
  • Git sync
  • SSO support
  • Audit logs

What people use each for

The jobs each tool is most often brought in to do.

Inngest

  • Handling unpredictable LLM behavior with fine-grained error controlnot Windmill
  • Retrying failed workflow steps independently without restartingnot Windmill
  • Rate limiting per-tenant usage on shared infrastructurenot Windmill
  • Processing thousands of webhooks per event with replay capabilitynot Windmill
  • Persisting state across serverless function invocationsnot Windmill

Windmill

  • Turning ad-hoc scripts into scheduled jobs and APIsnot Inngest
  • Building internal tools from existing Python/TypeScript codenot Inngest
  • Self-hosted automation for engineering teamsnot Inngest
  • Orchestrating multi-language workflowsnot Inngest

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

Inngest

  • Hobby plans pause execution once free quota exhausted; upgrade required to continue
  • Pro plan overages carry tiered metering: additional concurrent steps at $25 per 25, span data at $3/GB, scores at $1.50 per 1K, events at $0.50 per 1M

Windmill

  • Free self-hosted tier caps SSO users at 10 and workspaces at 3, requiring Enterprise for larger teams.
  • Compute unit and seat-based pricing (developer vs. operator seats, worker compute units) adds pricing complexity beyond a flat monthly fee.
  • Email triggers are capped at 100/day on the free tier, limiting event-driven use cases without upgrading.
  • Smaller ecosystem of pre-built integrations compared to more established automation tools like n8n.

Pricing, plan by plan

Inngest

Free
  • HobbyFree
    • 50k executions/month
    • 5 concurrent steps
    • 500 MB span data
  • Pro$99/month starting
    • 1M executions included, pay-as-you-go up to 20M
    • 100+ concurrent steps
    • 5 GB span data ingested
  • Enterprise$null/custom
    • customizable metrics
    • 90-day trace retention
    • SAML, RBAC, audit trails

Windmill

Free
  • Free / Open-sourceFree
    • Unlimited executions
    • Self-hosted deployment
    • Max 10 users with SSO
  • Enterprise$120/month
    • Unlimited executions and workspaces
    • Uncapped SSO seats
    • 24/7 priority support (3-hour response)

Which should you pick?

Choose Inngest if

  • You want to start without paying.
Inngest review

Choose Windmill if

  • You need script-to-workflow engine.
  • You want to start without paying.
  • You work on web, api, linux, windows, mac.
  • You also want auto-generated uis.
Windmill review

Questions people ask

Is Inngest or Windmill better?
Neither clearly leads. Inngest starts at Free and Windmill at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Inngest or Windmill?
Inngest starts at Free and Windmill at Free.
Does Inngest or Windmill run on more platforms?
Inngest runs on Web. Windmill runs on web, api, linux, windows, mac.
Can I use Inngest for free?
Both have a free tier, so you can try either at no cost before committing.
What is Inngest best used for?
Inngest is most often used for handling unpredictable llm behavior with fine-grained error control, retrying failed workflow steps independently without restarting, rate limiting per-tenant usage on shared infrastructure, processing thousands of webhooks per event with replay capability. Of those, handling unpredictable llm behavior with fine-grained error control and retrying failed workflow steps independently without restarting are not what Windmill is typically brought in for.
What can Inngest do that Windmill cannot?
Windmill covers Script-to-workflow engine, Auto-generated UIs, Self-hosted deployment, Git sync.

Answered from the vendors’ own pages

Inngest: How much does Inngest cost?

Inngest offers a free Hobby plan with 50k executions per month and up to 3 users. Pro plans start at $99 per month with 1M executions included and support for up to 15 users. Additional Pro users cost $10 each. Enterprise plans require custom pricing.

Source
Windmill: What does Windmill cost?

Windmill's Free and Open-source edition is $0/month for self-hosted use with unlimited executions, while Enterprise starts at $120/month with unlimited workspaces and uncapped SSO seats, priced further by developer/operator seats and compute units.

Source
Inngest: Is there a free version of Inngest?

Yes, the Hobby plan is completely free and includes 50k executions per month, 5 concurrent steps, 500 MB span data ingested, 10K scores, 500k events ingested, and support for up to 3 users. Plan changes pause execution once the free quota is exhausted.

Source
Windmill: Is there a free plan and what are its limits?

The free self-hosted plan supports unlimited executions but caps SSO at 10 users, workspaces at 3, groups/permissions at 4, and email triggers at 100 per day.

Source
Inngest: What are the overage costs on Inngest Pro?

Inngest Pro includes 1M executions with additional executions at $0.50 per 1M up to 20M. Span data overages cost $3 per GB, scores at $1.50 per 1K, and events at $0.50 per 1M. Additional concurrent steps cost $25 per 25 steps beyond the included 100+.

Source
Windmill: How is usage metered on Windmill Enterprise?

Enterprise usage is metered through seats (developer seats at $20/month, operator seats at $10/month) and compute units, e.g. $100/month for 2 standard-worker compute units.

Source
Windmill: What happens to a self-hosted Windmill deployment if the company shuts down?

The pricing page addresses this directly as an FAQ topic, noting that self-hosted applications built on the open-source edition can continue running independently of Windmill the company.

Source
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