Langflow vs Haystack vs Stack AI vs Semantic Kernel

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
Stack AI
Competitor 3
Semantic Kernel
Compare
4 tools · best value per row highlighted
Your tool Langflow
langflow.org
Drag and drop AI
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 Stack AI
stack-ai.com
Connect AI models visually
Make main Remove
Competitor 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.
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
215.3Kvisits/mo
—
6.3Kvisits/mo
—
MoM change
▼ 0.7%
—
▼ 57.9%
—
6-month growth
-4.9%
—
-93.7%
—
Global rank web
#217,191
—
#1,700,092
—
Avg. last 3 months
225.2K
—
13.9K
—
Bounce rate lower is better
44%
—
39%
—
Pages / visit
2.2
—
1.8
—
Visit duration
1m 04s
—
14s
—
Traffic sources
● Direct 76% · ● Referral 24%
—
—
—
LangflowHaystackStack AISemantic Kernel
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
—
Freemium
—
Starting price
Free
—
Free tier
—
Free tier
–
–
Free trial
–
–
–
API access
–
Plans
—
—
—
—
Capabilities input → output
Input
Text
CodeDocuments
DataDocumentsText
CodeText
Output
Apps
Apps
Apps
Apps
Skill level
Advanced
Advanced
Intermediate
Advanced
Categories
Chatbots & CompanionsDevelopment & CodeProductivity & OfficeAI Agent+3 more
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Development & CodeProductivity & OfficeAI AgentAI Workflow+1 more
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
9
2
3
2
Agents
Agent creation
–
No-code
–
–
Workflows
–
–
Chatbots
–
–
–
Developer tools
–
–
–
Development
–
–
–
LLM development
–
–
–
APIs
–
–
–
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
–
–
–
–

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.