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Automation Integration · head to head

Merge vs Windmill

Merge logo

Merge

Automation Integration

One API for all your integrations

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: Merge cannot access data outside Merge's universal schema; no support for custom objects or deep field mappings; Windmill free self-hosted tier caps SSO users at 10 and workspaces at 3, requiring Enterprise for larger teams.
  • They diverge on capability: Merge covers Unified API, 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 Merge and Windmill actually diverge.

Attributes where Merge and Windmill differ
AttributeMergeWindmill
Pricing modelusage-basedopen-source
PlatformsApiweb, api, linux, windows, mac
Founded2020Unknown

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 Merge

  • Unified API
  • HRIS integrations
  • Accounting integrations
  • CRM integrations
  • ATS integrations
  • Ticketing integrations
  • File storage integrations
  • Workday

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.

Merge

  • Workflow Automationnot Windmill
  • Data Integrationnot Windmill
  • Process Automationnot Windmill
  • App Integrationnot Windmill
  • API Connectivitynot Windmill

Windmill

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

Where each one falls short

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

Merge

  • Cannot access data outside Merge's universal schema; no support for custom objects or deep field mappings
  • Merge holds customer OAuth tokens, creating vendor lock-in; switching providers requires re-authentication from all customers
  • No support for legacy systems without APIs; limited to modern SaaS applications
  • Pricing complexity at scale with multiple dimensions (workflows, tasks, connectors) affecting costs

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

Merge

Free
  • FreeFree
    • 1 linked account
    • All integrations
    • Standard support
  • Launch$650/month
    • 50 linked accounts
    • All categories
    • Email support
  • Scale$2500/month
    • Unlimited accounts
    • Priority support
    • SLA
  • Enterprise$undefined/month
    • Dedicated support
    • Custom contracts
    • Advanced security

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 Merge if

  • You need unified api.
  • You want to start without paying.
  • You work on Api.
  • You also want hris integrations.
Merge 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 Merge or Windmill better?
Neither clearly leads. Merge 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, Merge or Windmill?
Merge starts at Free and Windmill at Free.
Does Merge or Windmill run on more platforms?
Merge runs on Api. Windmill runs on web, api, linux, windows, mac.
Can I use Merge for free?
Both have a free tier, so you can try either at no cost before committing.
What is Merge best used for?
Merge is most often used for workflow automation, data integration, process automation, app integration. Of those, workflow automation and data integration are not what Windmill is typically brought in for.
What can Merge do that Windmill cannot?
Merge covers Unified API, HRIS integrations, Accounting integrations, CRM integrations. Windmill covers Script-to-workflow engine, Auto-generated UIs, Self-hosted deployment, Git sync.

Answered from the vendors’ own pages

Merge: What is a Linked Account in Merge?

A Linked Account represents an end customer's authenticated connection to a third-party application (like Salesforce, HubSpot, or Zendesk). Merge pricing is based on the number of production Linked Accounts your end users activate.

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
Merge: Can I access custom data not in Merge's universal schema?

No. Merge works well for standardized integrations but hits limits with enterprise customers. You cannot access data outside Merge's universal schema, cannot customize integration behavior for specific customers, and cannot pull deeply custom data from source systems.

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
Merge: What happens if I switch away from Merge?

Merge holds your customers' OAuth tokens. Switching providers means asking every customer to re-authenticate, resulting in potential customer churn and unhappy users.

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
Merge: Does Merge work with legacy systems?

No. Merge only works if there's an API. Legacy ERPs, government portals, insurance carriers, and older enterprise systems that customers depend on often don't have APIs, making Merge unable to support these integrations.

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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