Haystack vs Stack AI vs Vapi vs Dify

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

Your tool
Haystack
vs
Competitor 1
Stack AI
Competitor 2
Vapi
Competitor 3
Dify
Compare
4 tools · best value per row highlighted
Your tool Haystack
haystack.deepset.ai
Haystack is an open-source AI orchestration framework from deepset for building production-grade LLM applications and agents.
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Competitor Stack AI
stack-ai.com
Connect AI models visually
Make main Remove
Competitor Vapi
vapi.ai
Vapi is a developer platform for building, testing and deploying voice AI agents that talk to customers on the phone.
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Competitor Dify
dify.ai
AI apps without code
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Traffic estimated monthly website traffic
Monthly visits
—
6.3Kvisits/mo
—
1Mvisits/mo
MoM change
—
▼ 57.9%
—
▼ 16.6%
6-month growth
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-93.7%
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-30.6%
Global rank web
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#1,700,092
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#39,510
Avg. last 3 months
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13.9K
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1.1M
Bounce rate lower is better
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39%
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41%
Pages / visit
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1.8
—
4.4
Visit duration
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14s
—
6m 40s
Traffic sources
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—
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● Direct 84% · ● Referral 15%
HaystackStack AIVapiDify
0368.2K736.4K1.1M1.5MStack 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 · 6.3KDify · 1.1MDify · 1.2MDify · 1.3MDify · 1.1MDify · 1.5MDify · 1.2MDify · 1.1MDify · 1.2MDify · 1.2MDify · 1M1K10K100K1M10MStack 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 · 6.3KDify · 1.1MDify · 1.2MDify · 1.3MDify · 1.1MDify · 1.5MDify · 1.2MDify · 1.1MDify · 1.2MDify · 1.2MDify · 1MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
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Freemium
Freemium
Freemium
Starting price
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Free tier
$29per month
$590per month · free tier available
Free tier
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Free trial
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API access
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Plans
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No Success Package FreeCore $29/moPro $999/moPremier Custom
Sandbox FreeProfessional $590/yrTeam $1,590/yrEnterprise Custom
Capabilities input → output
Input
CodeDocuments
DataDocumentsText
AudioText
DocumentsText
Output
Apps
Apps
AppsAudio
Apps
Skill level
Advanced
Intermediate
Advanced
Intermediate
Categories
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Development & CodeProductivity & OfficeAI AgentAI Workflow+1 more
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Chatbots & CompanionsDevelopment & CodeProductivity & OfficeAI Agent+4 more
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
7
7
11
9
Agent creation
Agents
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Developer tools
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No-code
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Workflows
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LLM development
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RAG
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Voice agents
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APIs
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Business automation
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Call agents
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Call center automation
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Chatbots
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Customer calls
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Customer support
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Process automation
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Agent memory
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Agent testing
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Call answering
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Calls
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Development
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Finance workflow automation
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Productivity
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Self hosted
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 0
▲ 0
▲ 1
Saves
0
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0
Reviews
0
0
0
0
Prompts
0
0
0
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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.