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Surveys · head to head

Retool vs Windmill

Retool logo

Retool

Surveys

The rapid internal tool platform

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: Retool builders and internal users are billed as separate seat types, so the true cost depends on the mix rather than the headcount; Windmill free self-hosted tier caps SSO users at 10 and workspaces at 3, requiring Enterprise for larger teams.
  • They diverge on capability: Retool covers Drag-and-drop builder, Windmill covers Script-to-workflow engine.
  • Prices and features above were last checked on 30 August 2026.

Where they differ

Only the attributes on which Retool and Windmill actually diverge.

Attributes where Retool and Windmill differ
AttributeRetoolWindmill
Pricing modelsubscriptionopen-source
PlatformsWeb, Self-hostedweb, api, linux, windows, mac
CategorySurveysAutomation Integration
Founded2017Unknown

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

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 Retool

  • Drag-and-drop builder
  • Database integration
  • REST API
  • Real-time data binding
  • Workflow automation
  • Custom code
  • Version control
  • 200+ integrations

Only in Windmill

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

Both cover

  • Self-hosted deployment

What people use each for

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

Retool

  • Building internal admin tools and dashboards over existing databases and APIsnot Windmill
  • Giving operations teams a UI for data they would otherwise query by handnot Windmill

Windmill

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

Where each one falls short

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

Retool

  • Builders and internal users are billed as separate seat types, so the true cost depends on the mix rather than the headcount
  • The free plan is capped at 5 users, 500 workflow runs a month and 5 GB of database capacity
  • Audit logging, permission controls, portals and custom branding all require the Business plan at $50 per builder per month billed annually
  • External user access is Business only, and is charged in bands above 50 users
  • Self hosted deployments mirror the cloud tiers but need Enterprise for unlimited users and SSO

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

Retool

Free
  • FreeFree
    • Unlimited web and mobile apps
    • 500 workflow runs monthly
    • 5GB database capacity
  • Team$10/month
    • Builders: $10/month (annual) or $12/month (monthly)
    • Internal users: $5/month (annual) or $7/month (monthly)
    • 5,000 workflow runs monthly
  • Business$50/month
    • Builders: $50/month (annual) or $65/month (monthly)
    • Internal users: $15/month (annual) or $18/month (monthly)
    • Audit logging
  • Enterprise$null/contact sales
    • Custom pricing
    • SSO integration
    • Unlimited users

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 Retool if

  • You need drag-and-drop builder.
  • You want to start without paying.
  • You work on Web, Self-hosted.
  • You also want database integration.
Retool 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 Retool or Windmill better?
Neither clearly leads. Retool 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, Retool or Windmill?
Retool starts at Free and Windmill at Free.
Does Retool or Windmill run on more platforms?
Retool runs on Web, Self-hosted. Windmill runs on web, api, linux, windows, mac.
Can I use Retool for free?
Both have a free tier, so you can try either at no cost before committing.
What is Retool best used for?
Retool is most often used for building internal admin tools and dashboards over existing databases and apis, giving operations teams a ui for data they would otherwise query by hand. Of those, building internal admin tools and dashboards over existing databases and apis and giving operations teams a ui for data they would otherwise query by hand are not what Windmill is typically brought in for.
What can Retool do that Windmill cannot?
Retool covers Drag-and-drop builder, Database integration, REST API, Real-time data binding. Windmill covers Script-to-workflow engine, Auto-generated UIs, Git sync, SSO support. Both handle Self-hosted deployment.

Answered from the vendors’ own pages

Retool: How much does Retool cost?

Retool offers a free tier. Paid cloud plans start at $10/month (Team - builders) or $5/month (Team - internal users), $50/month (Business - builders) or $15/month (Business - internal users). Enterprise pricing is custom. Annual billing provides 20% savings.

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
Retool: What is the difference between builders and internal users?

Builders are users who create applications in Retool, while internal users are those who only access and use the applications. Internal users cost significantly less than builders on all paid tiers.

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
Retool: Can I self-host Retool?

Yes, Free, Team, and Business tiers support self-hosting with comparable features to cloud versions. Enterprise is required for unlimited users, SSO, and advanced self-host features.

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
Retool: What are AI credits and how do they work?

AI credits are used for app building and AI actions. Free tier includes 250 monthly credits, Team includes 1,000, and Business includes 3,000. Credits renew monthly without carryover and are pooled at the organization level.

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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