Vapi vs Dify vs Haystack vs Synthflow

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

Your tool
Vapi
vs
Competitor 1
Dify
Competitor 2
Haystack
Competitor 3
Synthflow
Compare
4 tools · best value per row highlighted
Your tool 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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Competitor 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 Synthflow
synthflow.ai
Synthflow is an enterprise voice AI platform for automating phone calls with AI agents.
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Traffic estimated monthly website traffic
Monthly visits
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1Mvisits/mo
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MoM change
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▼ 16.6%
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6-month growth
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-30.6%
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Global rank web
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#39,510
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Avg. last 3 months
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1.1M
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Bounce rate lower is better
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41%
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Pages / visit
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4.4
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Visit duration
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6m 40s
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Traffic sources
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● Direct 84% · ● Referral 15%
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VapiDifyHaystackSynthflow
0368.2K736.4K1.1M1.5MDify · 1.1MDify · 1.2MDify · 1.3MDify · 1.1MDify · 1.5MDify · 1.2MDify · 1.1MDify · 1.2MDify · 1.2MDify · 1M1M10MDify · 1.1MDify · 1.2MDify · 1.3MDify · 1.1MDify · 1.5MDify · 1.2MDify · 1.1MDify · 1.2MDify · 1.2MDify · 1MNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Freemium
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Starting price
$29per month
$590per 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
No Success Package FreeCore $29/moPro $999/moPremier Custom
Sandbox FreeProfessional $590/yrTeam $1,590/yrEnterprise Custom
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Capabilities input → output
Input
AudioText
DocumentsText
CodeDocuments
AudioText
Output
AppsAudio
Apps
Apps
AppsAudio
Skill level
Advanced
Intermediate
Advanced
Intermediate
Categories
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Chatbots & CompanionsDevelopment & CodeProductivity & OfficeAI Agent+4 more
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Business & MarketingAI Call CenterAI Customer Service
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
11
9
7
11
Agent creation
Developer tools
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Agents
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Voice agents
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Call center automation
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LLM development
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Call agents
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Customer calls
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Call answering
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Calls
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Customer support
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Agent testing
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No-code
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RAG
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Workflows
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APIs
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Chatbots
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Agent memory
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Call analysis
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Customer support automation
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Development
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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
▲ 1
▲ 0
▲ 0
Saves
0
0
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Reviews
0
0
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Prompts
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.