Langflow vs Haystack vs Vapi vs Stack AI

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

Your tool
Langflow
vs
Competitor 1
Haystack
Competitor 2
Vapi
Competitor 3
Stack AI
Compare
4 tools · best value per row highlighted
Your tool Langflow
langflow.org
Drag and drop AI
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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 Stack AI
stack-ai.com
Connect AI models visually
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Traffic estimated monthly website traffic
Monthly visits
215.3Kvisits/mo
—
—
6.3Kvisits/mo
MoM change
▼ 0.7%
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▼ 57.9%
6-month growth
-4.9%
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-93.7%
Global rank web
#217,191
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#1,700,092
Avg. last 3 months
225.2K
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—
13.9K
Bounce rate lower is better
44%
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39%
Pages / visit
2.2
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1.8
Visit duration
1m 04s
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—
14s
Traffic sources
● Direct 76% · ● Referral 24%
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LangflowHaystackVapiStack AI
073.8K147.7K221.5K295.3KLangflow · 295.3KLangflow · 247KLangflow · 269.8KLangflow · 226.5KLangflow · 239.5KLangflow · 229.4KLangflow · 243.6KLangflow · 216.8KLangflow · 215.3KStack 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 · 6.3K1K10K100K1MLangflow · 295.3KLangflow · 247KLangflow · 269.8KLangflow · 226.5KLangflow · 239.5KLangflow · 229.4KLangflow · 243.6KLangflow · 216.8KLangflow · 215.3KStack 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 · 6.3KNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Free
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Freemium
Freemium
Starting price
Free
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$29per month
Free tier
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
Text
CodeDocuments
AudioText
DataDocumentsText
Output
Apps
Apps
AppsAudio
Apps
Skill level
Advanced
Advanced
Advanced
Intermediate
Categories
Chatbots & CompanionsDevelopment & CodeProductivity & OfficeAI Agent+3 more
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Business & MarketingVoice & SpeechAI Call CenterAI Customer Service+1 more
Development & CodeProductivity & OfficeAI AgentAI Workflow+1 more
Tasks what each tool can do · 0 shared · core   partial
Tasks covered
9
5
7
5
Agents
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Agent creation
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No-code
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LLM development
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Workflows
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Developer tools
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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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APIs
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Agent memory
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Call answering
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Calls
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Finance workflow automation
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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.