Try our new research platform with insights from 80,000+ expert users

Azure Database for PostgreSQL vs Microsoft Azure Cosmos DB comparison

 

Comparison Buyer's Guide

Executive SummaryUpdated on Oct 19, 2025

Review summaries and opinions

We asked business professionals to review the solutions they use. Here are some excerpts of what they said:
 

ROI

Sentiment score
4.9
Azure Database for PostgreSQL offers cost savings, efficiency, and flexibility, reducing operational costs and management time with a pay-as-you-go model.
Sentiment score
6.2
Organizations report cost savings and efficiency with Azure Cosmos DB, but some experience complexity and difficulty achieving expected savings.
It offers at least 25 percent cost savings compared to maintaining on-premises databases.
Principle azure architect at Intercept
Now, we use embedded PostgreSQL vectors, which will undoubtedly reduce the TCO by using a much more cost-effective solution.
Head of cloud, data, and AI at BJSS
We've reduced our total ownership cost because we are not spending on expensive SQL server licenses.
Admin (hands on user) at a comms service provider with 11-50 employees
Getting an MVP of that project would have taken six to eight months, but because we had an active choice of using Azure Cosmos DB and other related cloud-native services of Azure, we were able to get to an MVP stage in a matter of weeks, which is six weeks.
Director | Data & AI at a tech services company with 11-50 employees
You can react quickly and trim down the specs, memory, RAM, storage size, etc. It can save about 20% of the costs.
Co-Founder at arpa
When I have done comparisons or cost calculations, I have sometimes personally seen as much as 25% to 30% savings.
Solutions Architect at CompuNet
 

Customer Service

Sentiment score
5.4
Azure Database for PostgreSQL support experiences vary, praised for responsiveness but criticized for inconsistency and contentious licensing issues.
Sentiment score
6.7
Microsoft Azure Cosmos DB support is generally responsive, but experiences vary, with premium users often reporting better satisfaction.
Once we open a support case, we have people engaged within about 20 minutes, especially for a Sev 1 issue.
Financial Advisor at a financial services firm with 10,001+ employees
On a scale from one to ten, I rate customer service and technical support a nine because they are quick in responding and in working with me to rectify any issues we come across.
Cloud Engineer at a financial services firm with 10,001+ employees
The documentation and training we've received through Microsoft Learn on how to migrate, deploy, and manage the solution is exceptional.
Head of cloud, data, and AI at BJSS
Premier Support has deteriorated compared to what it used to be, especially for small to medium-sized customers like ours.
Head of IT, Infrastructure, Operations & Applications Development at a manufacturing company with 201-500 employees
The response was quick.
Lead Cloud Architect at Solliance, Inc
I would rate customer service and support a nine out of ten.
Director | Data & AI at a tech services company with 11-50 employees
 

Scalability Issues

Sentiment score
5.6
Azure Database for PostgreSQL scales efficiently, supporting complex applications with features like FlexServer and recent redundancy and auto-scaling improvements.
Sentiment score
7.7
Microsoft Azure Cosmos DB offers scalable, flexible solutions with efficient cost management, ideal for large enterprises, despite partition size limits.
We do not have to buy everything and build it. It is already there.
Systems Engineer II at ICW Group
However, we can see how well it scales after we deploy it for some large enterprise customers or big government organizations.
Head of cloud, data, and AI at BJSS
The scaling options with FlexServer provide us with the flexibility we need based on application complexity.
Director, Alliances & Engineering at a computer software company with 1,001-5,000 employees
The system scales up capacity when needed and scales down when not in use, preventing unnecessary expenses.
Associate Software Architect at a tech vendor with 51-200 employees
We like that it can auto-scale to demand, ensuring we only pay for what we use.
CTO at Stellium Consulting
We have had no issues with its ability to search through large amounts of data.
Full Stack Software Developer at a tech vendor with 10,001+ employees
 

Stability Issues

Sentiment score
7.2
Azure Database for PostgreSQL is praised for stability, reliable uptime, and Microsoft’s swift resolution of occasional performance issues.
Sentiment score
7.6
Microsoft Azure Cosmos DB offers high availability and reliability, with users praising its scalability, integration, and minimal downtime.
It is the go-to database if seeking performance and capacity.
Director at a financial services firm with 10,001+ employees
I have not experienced any downtime, crashes, or performance issues; it has been very stable.
Cloud Engineer at a financial services firm with 10,001+ employees
There is a stability issue where, if the database usage peaks quickly, it may crash and require intervention to restore functionality.
Principle azure architect at Intercept
We have multiple availability zones, so nothing goes down.
Hands on user at a manufacturing company with 10,001+ employees
Azure Cosmos DB would be a good choice if you have to deploy your application in a limited time frame and you want to auto-scale the database across different applications.
Associate Data Analytics L1 at a computer software company with 10,001+ employees
I would rate it a ten out of ten in terms of availability and latency.
Azure Consultant at Deloitte
 

Room For Improvement

Azure Database for PostgreSQL needs enhancements in scalability, reliability, monitoring, integrations, user management, and disaster recovery features.
Microsoft Azure Cosmos DB needs improvements in query complexity, API integration, performance, documentation, cost management, and user-interface enhancements.
It does not presently support knowledge graph functionalities as Neo4j does.
Product manager at a financial services firm with 5,001-10,000 employees
Azure Database for PostgreSQL can be improved by allowing quicker scaling without blips.
Principle azure architect at Intercept
I believe there could be improvements in the mirroring part and Change Data Capture (CDC).
Director, Alliances & Engineering at a computer software company with 1,001-5,000 employees
We must ensure data security remains the top priority.
Cloud Solutions Architect and Microsoft Principal Consultant for EMEA at a tech vendor with 10,001+ employees
You have to monitor the Request Units.
Co-Founder at arpa
The dashboard could include more detailed RU descriptions, IOPS, and compute metrics.
Architecte Cloud at Visiativ SA
 

Setup Cost

Azure Database for PostgreSQL offers cost-effective scalability with pay-as-you-go pricing, despite higher costs than on-premises solutions.
Azure Cosmos DB pricing varies, appreciated for scalability but seen as costly with high demand and complex environments.
We've reduced costs by 60 percent compared to maintaining on-premises solutions.
Director, Alliances & Engineering at a computer software company with 1,001-5,000 employees
We chose it because it is more cost-effective than Microsoft SQL.
Cloud Solutions Architect at Measurement Incorporated
Once you are comfortable and ready to make some commitments, you get about 30 percent saving if you are going with one-year or three-year reservation cost.
Staff Data Engineer at a transportation company with 10,001+ employees
Initially, it seemed like an expensive way to manage a NoSQL data store, but so many improvements that have been made to the platform have made it cost-effective.
Lead Cloud Architect at Solliance, Inc
Cosmos DB is expensive, and the RU-based pricing model is confusing.
IT Data Architect & Manager at Ternium Mexico S.A. de C.V.
Cosmos DB is great compared to other databases because we can reduce the cost while doing the same things.
Lead Software Architect at CPower
 

Valuable Features

Azure Database for PostgreSQL offers simplicity, performance, security, scalability, and AI integration, enhancing cloud strategy through robust features.
Microsoft Azure Cosmos DB is valued for scalability, ease of integration, global distribution, security, and support for diverse applications.
My takeaway as a CTO is that they're comfortable with the security posture, the features, the observability, alerts, and now it integrates into the rest of the Azure landscape.
Head of cloud, data, and AI at BJSS
The query analyzers help me find out what's happening in each of the queries.
IT Director at Infosys
If a database has any task that has been interrupted or any connection issue, it will alert LogicMonitor, and we have a centralized panel for all the alerts.
System Engineer II at a insurance company with 501-1,000 employees
The most valuable feature of Microsoft Azure Cosmos DB is its real-time analytics capabilities, which allow for turnaround times in milliseconds.
Vice President, Machine Learning at a healthcare company with 10,001+ employees
Performance and security are valuable features, particularly when using Cosmos DB for MongoDB emulation and NoSQL.
IT Data Architect & Manager at Ternium Mexico S.A. de C.V.
The performance and scaling capabilities of Cosmos DB are excellent, allowing it to handle large workloads compared to other services such as Azure AI Search.
CTO at Stellium Consulting
 

Categories and Ranking

Azure Database for PostgreSQL
Ranking in Database as a Service (DBaaS)
5th
Average Rating
8.8
Reviews Sentiment
6.3
Number of Reviews
23
Ranking in other categories
Open Source Databases (5th)
Microsoft Azure Cosmos DB
Ranking in Database as a Service (DBaaS)
4th
Average Rating
8.2
Reviews Sentiment
6.9
Number of Reviews
109
Ranking in other categories
NoSQL Databases (2nd), Managed NoSQL Databases (1st), Vector Databases (1st)
 

Mindshare comparison

As of January 2026, in the Database as a Service (DBaaS) category, the mindshare of Azure Database for PostgreSQL is 3.3%, up from 0.3% compared to the previous year. The mindshare of Microsoft Azure Cosmos DB is 4.1%, up from 0.8% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Database as a Service (DBaaS) Market Share Distribution
ProductMarket Share (%)
Microsoft Azure Cosmos DB4.1%
Azure Database for PostgreSQL3.3%
Other92.6%
Database as a Service (DBaaS)
 

Featured Reviews

Sathish Palanisamy - PeerSpot reviewer
Staff Data Engineer at a transportation company with 10,001+ employees
Improves database performance, supports AI integration, and accelerates customer-focused innovation
Azure Database for PostgreSQL can be improved in the area of elastic capabilities. One of the things we were actively looking for is the elastic feature, which was made a GA at this Ignite event. I am really happy that finally in Azure, we have a product which we can use for elastic clusters. If you are bound with a single server, then you have a vertical limit. Now you do not have any limits. As long as your use case grows, we can grow. The only thing I would maybe be thinking about is we should also allow customers to pick different node sizes for every node inside the elastic eventually. Some nodes do not need that big capacity. So that may be a nice-to-have feature, though it is not a must-have at this point.
reviewer2724105 - PeerSpot reviewer
Senior Director of Product Management at a tech vendor with 1,001-5,000 employees
Provides super sharp latency, excellent availability, and the ability to effectively manage costs across different tenants
For integrating Microsoft Azure Cosmos DB with other Azure products or other products, there are a couple of challenges with the current system. Right now, the vectors are stored as floating-point numbers within the NoSQL document, which makes them inefficiently large. This leads to increased storage space requirements, and searching through a vast number of documents in the vector database becomes quite costly in terms of RUs. While the integration works well, the expense associated with it is relatively high. I would really like to see a reduction in costs for their vector search, as it is currently on the expensive side. The areas for improvement in Microsoft Azure Cosmos DB are vector pricing and vector indexing patterns, which are unintuitive and not well described. I would also like to see the parameters of Fleet Spaces made more powerful, as currently, it's somewhat lightweight. I believe they've made those changes intentionally to better understand the cost model. However, we would like to take a more aggressive approach in using it. One of the most frustrating aspects of Microsoft Azure Cosmos DB right now is that you can only store one vector per document. Additionally, you must specify the configuration of that vector when you create an instance of Microsoft Azure Cosmos DB. Once the database is set up, you can't change the vector configuration, which is incredibly limiting for experimentation. You want the ability to try different settings and see how they perform, as there are numerous use cases for storing more than one vector in a document. While interoperability within the vector database is acceptable—for example, I can search for vectors—I still desire a richer set of configuration options.
report
Use our free recommendation engine to learn which Database as a Service (DBaaS) solutions are best for your needs.
880,745 professionals have used our research since 2012.
 

Top Industries

By visitors reading reviews
Financial Services Firm
15%
Manufacturing Company
15%
Marketing Services Firm
13%
Educational Organization
9%
Legal Firm
13%
Financial Services Firm
11%
Comms Service Provider
9%
Manufacturing Company
8%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business3
Midsize Enterprise4
Large Enterprise16
By reviewers
Company SizeCount
Small Business33
Midsize Enterprise21
Large Enterprise58
 

Questions from the Community

What is your experience regarding pricing and costs for Azure Database for PostgreSQL?
My experience with pricing, setup costs, and licensing for Azure Database for PostgreSQL is positive; I appreciate it all. The pricing is very cost-effective and stable given that we have many data...
What needs improvement with Azure Database for PostgreSQL?
Azure Database for PostgreSQL can be improved in ways I'm very curious to explore with Horizon. I'm interested in seeing how the fully enterprise-hardened features change things and where that blur...
What is your primary use case for Azure Database for PostgreSQL?
My main use cases for Azure Database for PostgreSQL came from a personal project to scratch an itch, and it was the easiest one to go grab. I appreciate how easy PostgreSQL is to get running locall...
What do you like most about Microsoft Azure Cosmos DB?
The initial setup is simple and straightforward. You can set up a Cosmos DB in a day, even configuring things like availability zones around the world.
What is your experience regarding pricing and costs for Microsoft Azure Cosmos DB?
Microsoft Azure Cosmos DB's pricing model has aligned with my budget expectations because I can tune the RU as I need to, which helps a lot. Microsoft Azure Cosmos DB's dynamic auto-scale or server...
What needs improvement with Microsoft Azure Cosmos DB?
I have not utilized Microsoft Azure Cosmos DB multi-model support for handling diverse data types. I'm not in the position to decide if clients will use Microsoft Azure Cosmos DB or any other datab...
 

Also Known As

No data available
Microsoft Azure DocumentDB, MS Azure Cosmos DB
 

Overview

 

Sample Customers

Information Not Available
TomTom, KPMG Australia, Bosch, ASOS, Mercedes Benz, NBA, Zero Friction, Nederlandse Spoorwegen, Kinectify
Find out what your peers are saying about Azure Database for PostgreSQL vs. Microsoft Azure Cosmos DB and other solutions. Updated: December 2025.
880,745 professionals have used our research since 2012.