Windmill vs Stack AI vs Stepper vs Appian

Which one fits you in 2026? Traffic, pricing, input → output, tasks and community side by side.

Your tool
Windmill
vs
Competitor 1
Stack AI
Competitor 2
Stepper
Competitor 3
Appian
Compare
4 tools · best value per row highlighted
Your tool Windmill
windmill.dev
Windmill is an open-source, code-first orchestration platform for internal software.
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Competitor Stack AI
stack-ai.com
Connect AI models visually
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Competitor Stepper
stepper.io
Building automated workflows traditionally requires either coding skills or wrestling with complex visual builders
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Competitor Appian
appian.com
Appian is an enterprise platform for process automation that orchestrates AI agents, existing systems and people from one place.
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Traffic estimated monthly website traffic
Monthly visits
—
6.3Kvisits/mo
49.9Kvisits/mo
—
MoM change
—
▼ 57.9%
▲ 34.2%
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6-month growth
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-93.7%
+519.2%
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Global rank web
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#1,700,092
#677,321
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Avg. last 3 months
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13.9K
38.1K
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Bounce rate lower is better
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39%
40%
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Pages / visit
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1.8
2.0
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Visit duration
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14s
47s
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Traffic sources
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—
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WindmillStack AIStepperAppian
042K84K126K167.9KStack AI · 143.4KStack AI · 153.7KStack AI · 167.9KStack AI · 160KStack AI · 99.4KStack AI · 35.9KStack AI · 17.4KStack AI · 20.6KStack AI · 14.9KStack AI · 6.3KStepper · 8.1KStepper · 15.4KStepper · 20.2KStepper · 27KStepper · 37.2KStepper · 49.9K1K10K100K1MStack AI · 143.4KStack AI · 153.7KStack AI · 167.9KStack AI · 160KStack AI · 99.4KStack AI · 35.9KStack AI · 17.4KStack AI · 20.6KStack AI · 14.9KStack AI · 6.3KStepper · 8.1KStepper · 15.4KStepper · 20.2KStepper · 27KStepper · 37.2KStepper · 49.9KNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Freemium
Freemium
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Starting price
$120per month · free tier available
Free tier
$19per month · free tier available
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Free tier
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Free trial
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API access
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Plans
Free and Open-source (self-host) FreeEnterprise $120/mo
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Free FreePro $19/moTeam Coming soon
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Capabilities input → output
Input
Code
DataDocumentsText
Text
DataDocumentsText
Output
Apps
Apps
Apps
Apps
Skill level
Advanced
Intermediate
Intermediate
Advanced
Categories
Development & CodeProductivity & OfficeAI Developer ToolsAI Workflow+1 more
Development & CodeProductivity & OfficeAI AgentAI Workflow+1 more
Productivity & OfficeAI Workflow
Development & CodeProductivity & OfficeAI AgentAI Workflow+1 more
Tasks what each tool can do · 3 shared · core   partial
Tasks covered
9
7
4
8
Workflows
Process automation
No-code
Agents
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Business automation
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Agent creation
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Finance workflow automation
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Self hosted
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APIs
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Developer tools
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Document data extraction
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Workflow deployment
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 0
▲ 0
▲ 0
Saves
0
0
0
0
Reviews
0
0
0
0
Prompts
0
0
0
0
Verified listing
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Traffic figures are third-party estimates for the tool's own domain; tools sharing a domain with a bigger product are not counted. Pricing is captured from each tool's site and may lag.