Clay
Windmill
| Feature | Clay | Windmill |
|---|---|---|
| Pricing | Free / from $149/mo | Free / from $10/mo |
| Free Plan | ✓ Yes | ✓ Yes |
| Rating | 4.6 / 5 | 4.4 / 5 |
| Best For | sales-teams, growth-teams, agencies, outbound-heavy-companies | developers, devops-teams, internal-tools, data-pipelines |
| Founded | 2017 | 2022 |
| Data Enrichment | ✓ | ✗ |
| Ai Research | ✓ | ✗ |
| Waterfall Enrichment | ✓ | ✗ |
| Outreach Personalization | ✓ | ✗ |
| Crm Integration | ✓ | ✗ |
| List Building | ✓ | ✗ |
| Ai Messaging | ✓ | ✗ |
| Workflow Editor | ✗ | ✓ |
| Script To Ui | ✗ | ✓ |
| Scheduling | ✗ | ✓ |
| Approval Flows | ✗ | ✓ |
| Multi Language | ✗ | ✓ |
| Self Hostable | ✗ | ✓ |
| Audit Logs | ✗ | ✓ |
✓ Clay Pros
- Aggregates 75+ data sources in one waterfall enrichment
- AI research agent writes personalized outreach copy
- Flexible spreadsheet-like interface for data manipulation
- Integrates with all major CRMs and sequencing tools
✗ Clay Cons
- Expensive for small teams (starter at $149/mo)
- Learning curve for advanced data workflows
- Credit system can be confusing to predict costs
✓ Windmill Pros
- Open-source and self-hostable
- Supports Python, TypeScript, Go, Bash, SQL natively
- Auto-generates UI from script parameters
- Excellent scheduling and workflow orchestration
✗ Windmill Cons
- Smaller community than Zapier/n8n
- Self-hosting requires infrastructure knowledge
- Less polished documentation for beginners
The Verdict
Clay is built for sales teams and growth teams, with a focus on data-enrichment and ai-research. Windmill targets developers and devops teams and leads with workflow-editor and script-to-ui.
On pricing, Windmill is the clear winner for budget-conscious users — starting at $10/mo compared to $149/mo for Clay. That $139/mo difference adds up quickly for growing teams.
Both offer free plans, so you can test each with your real workflow before committing to a subscription.
This is a genuinely close comparison. If you can, sign up for both free trials (where available) and run a one-week test with your actual team tasks before deciding.