Vapi vs Haystack vs Code Wiki vs LangChain

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

Your tool
Vapi
vs
Competitor 1
Haystack
Competitor 2
Code Wiki
Competitor 3
LangChain
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.
Remove
Competitor Haystack
haystack.deepset.ai
Haystack is an open-source AI orchestration framework from deepset for building production-grade LLM applications and agents.
Make main Remove
Competitor Code Wiki
codewiki.google
Your codebase documents itself—that's the core promise here
Make main Remove
Competitor LangChain
langchain.com
Framework for building with large language models
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
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152.5Kvisits/mo
3.4Mvisits/mo
MoM change
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▼ 17.8%
▲ 0.7%
6-month growth
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-70.8%
+21.0%
Global rank web
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#251,881
#13,384
Avg. last 3 months
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225.3K
3.3M
Bounce rate lower is better
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41%
42%
Pages / visit
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3.0
6.2
Visit duration
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55s
5m 29s
Traffic sources
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● Direct 76% · ● Referral 24%
● Direct 73% · ● Referral 24%
VapiHaystackCode WikiLangChain
0850.7K1.7M2.6M3.4MCode Wiki · 485KCode Wiki · 826KCode Wiki · 542.2KCode Wiki · 522.7KCode Wiki · 400.3KCode Wiki · 227.3KCode Wiki · 338.1KCode Wiki · 185.4KCode Wiki · 152.5KLangChain · 3MLangChain · 2.9MLangChain · 3.2MLangChain · 2.8MLangChain · 3.4MLangChain · 3.2MLangChain · 3.1MLangChain · 3.4MLangChain · 3.4M100K1M10MCode Wiki · 485KCode Wiki · 826KCode Wiki · 542.2KCode Wiki · 522.7KCode Wiki · 400.3KCode Wiki · 227.3KCode Wiki · 338.1KCode Wiki · 185.4KCode Wiki · 152.5KLangChain · 3MLangChain · 2.9MLangChain · 3.2MLangChain · 2.8MLangChain · 3.4MLangChain · 3.2MLangChain · 3.1MLangChain · 3.4MLangChain · 3.4MNov '25DecJan '26FebMarAprMayJunJul
Pricing
Model
Freemium
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Free
Freemium
Starting price
$29per month
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Free
$39per month · free tier available
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
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Developer FreePlus $39/moEnterprise Custom/mo
Capabilities input → output
Input
AudioText
CodeDocuments
Code
CodeText
Output
AppsAudio
Apps
ImagesText
Apps
Skill level
Advanced
Advanced
Intermediate
Advanced
Categories
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Development & CodeAI Developer Tools
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
11
7
7
6
Agent creation
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Developer tools
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Agents
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LLM development
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Agent testing
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Code documentation
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Codebase q a
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RAG
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Voice agents
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APIs
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Architecture
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Call agents
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Call center automation
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Code explanations
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Customer calls
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Customer support
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Development
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Agent memory
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Call answering
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Calls
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Code analysis
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Code summaries
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GitHub pull requests
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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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▲ 1
Saves
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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.