MongoDB Atlas vs Weaviate

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

The short answer

Weaviate is the stronger AI pick in Vector Databases: it has a visibility score of 45.2 versus 12.7 for MongoDB Atlas, and ranks ahead in 86% of the answers that name both.

Choose MongoDB Atlas if…

You want a lower entry price ($0.011 vs $45)
You need ISO/IEC 27001:2022 or FedRAMP Moderate (Atlas for Government) or TX-RAMP Level 2 or PCI DSS or HIPAA or GDPR or CSA STAR coverage
You prefer a larger, established vendor (5,000+ employees)
stores documents and vector embeddings together in one system

Choose Weaviate if…

You want the brand AI engines rank higher (45.2 vs 12.7)
AI answers describe it more positively (59% vs 28% positive)
You need SOC 2 Type II or HIPAA (Enterprise Cloud on AWS) coverage
Strong native hybrid search

AI visibility side by side

Latest weekly run · Nov 2

Metric	MongoDB Atlas	Weaviate
Visibility score	12.7%	45.2%
Change vs last week	New	New
Rank in Vector Databases	#8	#4
Share of voice	5.5%	11.7%
Mentions this run	26	56
Positive in AI answers	28%	59%

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

Visibility score trend

Weekly runs over the last 60 days

MongoDB Atlas 0pp · Weaviate 0pp over 0 weekly runs.

Engine by engine

Weaviate leads on 3 of 3 engines

ChatGPT

15.4%

57.8%

AI Mode

13.9%

40%

Perplexity

8.9%

37.8%

MongoDB AtlasWeaviate

Head to head in AI answers

22 engine answers name both brands

3MongoDB Atlas ranked higher

19Weaviate ranked higher

Prompt	Engine	MongoDB Atlas	Weaviate
How do I choose a vector database for a mid-market team?	ChatGPT	#6	#4
How do I choose a vector database for a mid-market team?	AI Mode	#5	#3
What features matter most in a vector database?	ChatGPT	#6	#3
How do companies store and search embeddings without a dedicated tool?	ChatGPT	#5	#9
What are the best Vector Databases tools in 2026?	ChatGPT	#10	#3
What are the best Vector Databases tools in 2026?	AI Mode	#8	#4
Top vector database options for B2B SaaS companies	AI Mode	#5	#3
Top vector database options for B2B SaaS companies	Perplexity	#8	#4
Best vector database for enterprise	AI Mode	#7	#4
Compare the leading Vector Databases platforms	ChatGPT	#8	#3
Compare the leading Vector Databases platforms	Perplexity	#9	#2
Which vector database has the best reviews?	ChatGPT	#3	#5

Features, pricing & fit

Dimension	MongoDB Atlas	Weaviate
Pricing model	Usage-based	Usage-based
Entry price	Free; paid from $0.011 / mo	Free; paid from $45 / mo
Free plan	Yes	Yes
Deployment	Fully managed cloud with Atlas Core and Atlas Infinite deployment options, or self-managed through MongoDB Enterprise Advanced	Serverless, Enterprise Cloud, or Bring Your Own Cloud
Integrations	100+	—
Compliance	ISO/IEC 27001:2022, FedRAMP Moderate (Atlas for Government), TX-RAMP Level 2, PCI DSS, HIPAA, GDPR, CSA STAR	SOC 2 Type II, HIPAA (Enterprise Cloud on AWS)
Support	Basic Support included free with Atlas, Paid plans with faster response times, Named Technical Support Engineers, Extended Lifecycle Support add-on	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	New York, NY, United States	Amsterdam, Netherlands
Employees	5,000+	51–200
Funding	IPO and stock offering · $311M raised	Strategic investment (Ricoh corporate venture fund)
Best for	Development teams building AI applications and agents that need operational data, vectors and search in one platform	Development teams and enterprises building search, RAG and agent applications who want an open-source, production-ready vector database.