LangChain vs pgvector vs Weaviate vs LlamaIndex

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

Your tool
LangChain
vs
Competitor 1
pgvector
Competitor 2
Weaviate
Competitor 3
LlamaIndex
Compare
4 tools · best value per row highlighted
Your tool LangChain
langchain.com
Framework for building with large language models
Remove
Competitor pgvector
github.com
pgvector is an open-source extension that adds vector similarity search to Postgres.
Make main Remove
Competitor Weaviate
weaviate.io
Search that understands meaning
Make main Remove
Competitor LlamaIndex
llamaindex.ai
Connect AI to your data
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
3.4Mvisits/mo
—
154.2Kvisits/mo
324Kvisits/mo
MoM change
▲ 0.7%
—
▼ 11.8%
▼ 21.0%
6-month growth
+21.0%
—
-7.0%
-29.5%
Global rank web
#13,384
—
#293,589
#118,014
Avg. last 3 months
3.3M
—
155.7K
398.3K
Bounce rate lower is better
42%
—
41%
46%
Pages / visit
6.2
—
1.9
2.8
Visit duration
5m 29s
—
50s
1m 57s
Traffic sources
● Direct 73% · ● Referral 24%
—
● Direct 82% · ● Referral 18%
● Direct 74% · ● Referral 20%
LangChainpgvectorWeaviateLlamaIndex
0850.7K1.7M2.6M3.4MLangChain · 3MLangChain · 2.9MLangChain · 3.2MLangChain · 2.8MLangChain · 3.4MLangChain · 3.2MLangChain · 3.1MLangChain · 3.4MLangChain · 3.4MWeaviate · 226KWeaviate · 193.3KWeaviate · 188.9KWeaviate · 165.9KWeaviate · 184.5KWeaviate · 169.2KWeaviate · 137.9KWeaviate · 174.8KWeaviate · 154.2KLlamaIndex · 438.2KLlamaIndex · 470.7KLlamaIndex · 444KLlamaIndex · 423.8KLlamaIndex · 459.5KLlamaIndex · 421.3KLlamaIndex · 455KLlamaIndex · 461KLlamaIndex · 410KLlamaIndex · 324K100K1M10MLangChain · 3MLangChain · 2.9MLangChain · 3.2MLangChain · 2.8MLangChain · 3.4MLangChain · 3.2MLangChain · 3.1MLangChain · 3.4MLangChain · 3.4MWeaviate · 226KWeaviate · 193.3KWeaviate · 188.9KWeaviate · 165.9KWeaviate · 184.5KWeaviate · 169.2KWeaviate · 137.9KWeaviate · 174.8KWeaviate · 154.2KLlamaIndex · 438.2KLlamaIndex · 470.7KLlamaIndex · 444KLlamaIndex · 423.8KLlamaIndex · 459.5KLlamaIndex · 421.3KLlamaIndex · 455KLlamaIndex · 461KLlamaIndex · 410KLlamaIndex · 324KNov '25DecJan '26FebMarAprMayJunJulAug
Pricing
Model
Freemium
Free
Freemium
Freemium
Starting price
$39per month · free tier available
Free
$45per month · free tier available
Free tier
Free tier
Free trial
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API access
–
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Plans
Developer FreePlus $39/moEnterprise Custom/mo
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Free FreeFlex $45/moPremium $0
Free FreeStarter Custom/moPro Custom/moEnterprise Custom/mo
Capabilities input → output
Input
CodeText
Data
DataImagesText
DocumentsImages
Output
Apps
Data
Data
DataText
Skill level
Advanced
Advanced
Advanced
Advanced
Categories
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Development & CodeAI Developer Tools
Development & CodeAI Developer Tools
Development & CodeProductivity & OfficeAI AgentAI Developer Tools+1 more
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
6
7
6
12
Developer tools
LLM development
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Vector databases
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Agents
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Development
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Information retrieval
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Agent creation
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Data extraction
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Document data extraction
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Document processing
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Vector indexes
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Databases
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OCR
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PostgreSQL assistance
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Text extraction
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APIs
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Agent testing
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Medical data extraction
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RAG
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SQL
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Self hosted
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Workflows
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 1
▲ 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.