pgvector vs Haystack vs LangChain vs Weaviate

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

Your tool
pgvector
vs
Competitor 1
Haystack
Competitor 2
LangChain
Competitor 3
Weaviate
Compare
4 tools · best value per row highlighted
Your tool pgvector
github.com
pgvector is an open-source extension that adds vector similarity search to Postgres.
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 LangChain
langchain.com
Framework for building with large language models
Make main Remove
Competitor Weaviate
weaviate.io
Search that understands meaning
Make main Remove
Traffic estimated monthly website traffic
Monthly visits
—
—
3.4Mvisits/mo
154.2Kvisits/mo
MoM change
—
—
▲ 0.7%
▼ 11.8%
6-month growth
—
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+21.0%
-7.0%
Global rank web
—
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#13,384
#293,589
Avg. last 3 months
—
—
3.3M
155.7K
Bounce rate lower is better
—
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42%
41%
Pages / visit
—
—
6.2
1.9
Visit duration
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5m 29s
50s
Traffic sources
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● Direct 73% · ● Referral 24%
● Direct 82% · ● Referral 18%
pgvectorHaystackLangChainWeaviate
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 · 154.2K100K1M10MLangChain · 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 · 154.2KNov '25DecJan '26FebMarAprMayJunJul
Pricing
Model
Free
—
Freemium
Freemium
Starting price
Free
—
$39per month · free tier available
$45per month · free tier available
Free tier
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Free trial
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–
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API access
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–
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Plans
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Developer FreePlus $39/moEnterprise Custom/mo
Free FreeFlex $45/moPremium $0
Capabilities input → output
Input
Data
CodeDocuments
CodeText
DataImagesText
Output
Data
Apps
Apps
Data
Skill level
Advanced
Advanced
Advanced
Advanced
Categories
Development & CodeAI Developer Tools
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Development & CodeProductivity & OfficeAI AgentAI Developer Tools
Development & CodeAI Developer Tools
Tasks what each tool can do · 1 shared · core   partial
Tasks covered
7
7
6
6
Developer tools
LLM development
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Agent creation
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Agents
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Vector databases
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RAG
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Self hosted
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Vector indexes
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Databases
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Development
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PostgreSQL assistance
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APIs
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Agent memory
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Agent testing
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Information retrieval
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SQL
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–
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Community on aitoolstime
Rating
no ratings yet
no ratings yet
no ratings yet
no ratings yet
Upvotes
▲ 0
▲ 0
▲ 1
▲ 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.