PostgreSQL vs Weaviate

Which one do AI engines recommend, and how do they differ on price, fit and features?

The short answer

PostgreSQL is the stronger AI pick in Vector Databases: it has a visibility score of 49 versus 45.2 for Weaviate, and ranks ahead in 39% of the answers that name both.

Choose PostgreSQL if…

You want the brand AI engines rank higher (49 vs 45.2)
Free open-source software
Adds vector search to an existing PostgreSQL database without a new database
Wide compatibility with drivers, BI tools, and language ecosystems

Choose Weaviate if…

AI answers describe it more positively (59% vs 35% positive)
You need SOC 2 Type II or HIPAA (Enterprise Cloud on AWS) coverage
Strong native hybrid search
Open-source and modular AI-native design

AI visibility side by side

Latest weekly run · Nov 2

Metric	PostgreSQL	Weaviate
Visibility score	49%	45.2%
Change vs last week	New	New
Rank in Vector Databases	#3	#4
Share of voice	12.6%	11.7%
Mentions this run	59	56
Positive in AI answers	35%	59%

The stronger value in each row is marked with a ✓.

Visibility score trend

Weekly runs over the last 60 days

PostgreSQL 0pp · Weaviate 0pp over 0 weekly runs.

Engine by engine

PostgreSQL leads on 2 of 3 engines

ChatGPT

44.3%

57.8%

AI Mode

42.8%

40%

Perplexity

59.8%

37.8%

PostgreSQLWeaviate

Head to head in AI answers

44 engine answers name both brands

17PostgreSQL ranked higher

27Weaviate ranked higher

Prompt	Engine	PostgreSQL	Weaviate
What is a vector database and when does a company need one?	ChatGPT	#2	#4
How do I choose a vector database for a mid-market team?	ChatGPT	#1	#4
How do I choose a vector database for a mid-market team?	AI Mode	#4	#3
How do I choose a vector database for a mid-market team?	Perplexity	#1	#4
What features matter most in a vector database?	ChatGPT	#4	#3
What are common mistakes when buying a vector database?	ChatGPT	#4	#3
How do companies store and search embeddings without a dedicated tool?	ChatGPT	#1	#9
What are the best Vector Databases tools in 2026?	ChatGPT	#5	#3
What are the best Vector Databases tools in 2026?	AI Mode	#6	#4
What are the best Vector Databases tools in 2026?	Perplexity	#3	#4
Best vector database for startups	ChatGPT	#1	#4
Best vector database for startups	Perplexity	#3	#5

Features, pricing & fit

Dimension	PostgreSQL	Weaviate
Pricing model	—	Usage-based
Entry price	—	Free; paid from $45 / mo
Free plan	—	Yes
Deployment	—	Serverless, Enterprise Cloud, or Bring Your Own Cloud
Compliance	—	SOC 2 Type II, HIPAA (Enterprise Cloud on AWS)
Support	Community mailing lists, Community events and local user groups	Email support on all plans, Phone and Slack support on Premium and Dedicated plans, Technical Account Team add-on on Premium and Dedicated plans
Founded	—	2019
Headquarters	United States	Amsterdam, Netherlands
Employees	51–200	51–200
Funding	—	Strategic investment (Ricoh corporate venture fund)
Best for	—	Development teams and enterprises building search, RAG and agent applications who want an open-source, production-ready vector database.