Semantic Kernel vs Haystack vs Vapi vs Langflow

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

Your tool
Semantic Kernel
vs
Competitor 1
Haystack
Competitor 2
Vapi
Competitor 3
Langflow
Compare
4 tools · best value per row highlighted
Your tool Semantic Kernel
learn.microsoft.com
Semantic Kernel is a lightweight, open-source development kit from Microsoft for building AI agents and adding AI models to existing C#, Python or Java codebases.
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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 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 Langflow
langflow.org
Drag and drop AI
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Traffic estimated monthly website traffic
Monthly visits
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215.3Kvisits/mo
MoM change
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▼ 0.7%
6-month growth
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-4.9%
Global rank web
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#217,191
Avg. last 3 months
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225.2K
Bounce rate lower is better
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44%
Pages / visit
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2.2
Visit duration
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1m 04s
Traffic sources
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● Direct 76% · ● Referral 24%
Semantic KernelHaystackVapiLangflow
073.8K147.7K221.5K295.3KLangflow · 295.3KLangflow · 247KLangflow · 269.8KLangflow · 226.5KLangflow · 239.5KLangflow · 229.4KLangflow · 243.6KLangflow · 216.8KLangflow · 215.3K100K1MLangflow · 295.3KLangflow · 247KLangflow · 269.8KLangflow · 226.5KLangflow · 239.5KLangflow · 229.4KLangflow · 243.6KLangflow · 216.8KLangflow · 215.3KNov '25DecJan '26FebMarAprMayJunJul
Pricing
Model
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Freemium
Free
Starting price
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$29per month
Free
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
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Capabilities input → output
Input
CodeText
CodeDocuments
AudioText
Text
Output
Apps
Apps
AppsAudio
Apps
Skill level
Advanced
Advanced
Advanced
Advanced
Categories
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Chatbots & CompanionsDevelopment & CodeProductivity & OfficeAI Agent+3 more
Tasks what each tool can do · 2 shared · core   partial
Tasks covered
5
7
11
9
Agent creation
Developer tools
Agents
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LLM development
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APIs
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No-code
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RAG
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Voice agents
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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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Development
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Workflows
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API integrations
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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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Self hosted
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
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Saves
0
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Reviews
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Prompts
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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.