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Amazon RDS vs Microsoft Azure Cosmos DB comparison

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Comparison Buyer's Guide

Executive SummaryUpdated on Jun 3, 2026

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
2.2
Amazon RDS users report cost savings and scalability, benefiting from AWS management, pay-as-you-go pricing, and increased agility.
Sentiment score
6.2
Azure Cosmos DB users see cost savings and efficiency, especially larger firms, though some report higher expenses and challenges.
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
6.8
Amazon RDS support varies by tier, with premium rated higher; users value documentation but face delays with standard support.
Sentiment score
6.8
Microsoft Azure Cosmos DB support is generally praised for robustness, though response speed and expertise can vary.
The documentation is quite good.
Corporate Database Architect at a tech services company with 201-500 employees
The official AWS technical support for Amazon RDS is helpful, providing 24/7 assistance for all business support cases with tools such as the health dashboard and AWS trusted advisor.
AWS Architect at Virtual University
I would rate the support from AWS very high, maybe nine, but it also depends on what kind of support you have signed in your contract, whether the premium support or the standard support.
Director Software Engineer at a computer software company with 10,001+ employees
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
7.0
Amazon RDS is praised for its strong scalability, easy scaling, and effective cloud-based expansion, despite some data challenges.
Sentiment score
7.7
Azure Cosmos DB offers scalable, cost-efficient resource management, seamless global expansion, and flexibility for large data volumes despite needing technical expertise.
Its automated scaling, both in storage and instances, is vital as it eliminates manual interventions.
AICE Graduate at alx_africa
The installation of Amazon RDS is quite easy and quite scalable.
Director Software Engineer at a computer software company with 10,001+ employees
Despite being a strong feature, scalability could be improved due to the lack of full functionality in autoscaling.
VP 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
8.1
Amazon RDS is highly stable, praised for reliability, minimal issues, and benefits from AWS's automated backup features.
Sentiment score
7.6
Microsoft Azure Cosmos DB is praised for stability and reliability, despite rare minor downtime during peak traffic or regional issues.
Amazon RDS is very stable when deployed correctly across different zones with the right configurations.
AICE Graduate at alx_africa
It is a stable product overall, with very few issues.
VP engineering at a computer software company with 1,001-5,000 employees
So far, I have not had any outages, crashes, or downtime.
Dev Ops Engineer at MyRobin.ID
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

Amazon RDS users face challenges with configuration, scalability, support, integration, and security, needing enhancements for better management and transition.
Azure Cosmos DB's pricing model and integration challenges impact usability, requiring enhanced tools, documentation, and feature improvements.
Simplifying migration for those transitioning from on-premises to cloud environments.
AICE Graduate at alx_africa
Having native Change Data Capture (CDC) support would be beneficial, allowing for seamless integration with Kafka without relying on external technologies like Debezium.
VP engineering at a computer software company with 1,001-5,000 employees
Enabling performance insights to view query formats where the bottlenecks occur, identifying the fixes, slow queries, and missing indexes.
AWS Architect at Virtual University
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.
Cloud Architect at a computer software company with 1,001-5,000 employees
 

Setup Cost

Amazon RDS pricing offers flexibility and savings, but requires careful cost management to avoid unexpected charges and manage expenses.
Azure Cosmos DB offers scalable pricing with dynamic auto-scaling options, requiring RU understanding but offering discounts and enterprise agreements.
While Azure provides great services, long-term plans on AWS are 20% to 30% cheaper.
AWS Engineer at Neurolov.ai
I find the pricing of Amazon RDS fair, as AWS operates on a pay-for-what-you-use model.
AICE Graduate at alx_africa
I rate the price for Amazon as eight on a scale from one to ten.
Corporate Database Architect at a tech services company with 201-500 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

Amazon RDS offers scalability, security, and ease of use with features like automated backups and high availability for diverse applications.
Microsoft Azure Cosmos DB offers scalable, flexible, and secure multi-modal NoSQL services with global reach and seamless Microsoft integration.
Amazon RDS provides data encryption using services like KMS, crucial for securing high-sensitive data and meeting compliance requirements such as HIPAA or PCI DSS.
AICE Graduate at alx_africa
Database management is effective in Amazon RDS because it offers automated backups, high availability, read replicas, and support from multiple database engineers, while also providing security, monitoring and metrics, scalability.
AWS Architect at Virtual University
In some cases, we are using the read replica feature, and it does improve our application performance because we do not allow any downstream system to come to the main storage or main databases and perform a query.
Director Software Engineer at a computer software company with 10,001+ 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

Amazon RDS
Ranking in Database as a Service (DBaaS)
2nd
Average Rating
8.4
Reviews Sentiment
6.7
Number of Reviews
59
Ranking in other categories
Relational Databases Tools (10th)
Microsoft Azure Cosmos DB
Ranking in Database as a Service (DBaaS)
3rd
Average Rating
8.2
Reviews Sentiment
7.0
Number of Reviews
113
Ranking in other categories
NoSQL Databases (1st), Managed NoSQL Databases (1st), Vector Databases (1st)
 

Mindshare comparison

As of September 2026, in the Database as a Service (DBaaS) category, the mindshare of Amazon RDS is 12.8%, down from 20.1% compared to the previous year. The mindshare of Microsoft Azure Cosmos DB is 4.9%, up from 3.1% compared to the previous year. It is calculated based on PeerSpot user engagement data.
Database as a Service (DBaaS) Mindshare Distribution
ProductMindshare (%)
Amazon RDS12.8%
Microsoft Azure Cosmos DB4.9%
Other82.3%
Database as a Service (DBaaS)
 

Featured Reviews

Donny Trijatmiko - PeerSpot reviewer
Dev Ops Engineer at MyRobin.ID
Managed databases have simplified recovery and high availability for AI recruitment workloads
The features of Amazon RDS that I have found most valuable and useful so far are its fully managed service, point-in-time restore, and other serverless features such as snapshots and backups, which have eased my job to manage databases. The automated backups of Amazon RDS help in data recovery by mitigating disaster recovery. I can revert to the nearest time if there is any data corruption or other issues, and this helps tremendously. I assess Amazon RDS's read replica feature for improving application performance as good. For standby nodes in Amazon RDS, I am using them for high failover, and so far it has been performing well. I have used Amazon RDS's Multi-AZ deployments, and it helps enhance data availability by providing high failover. It enhances high availability for my application as well.
Michael Hasenfang - PeerSpot reviewer
Director, Platform Engineering - Infrastructure Systems and Automation at a computer software company with 1,001-5,000 employees
Collecting compliance data has become more efficient while managing unstructured inputs for reporting
The features that I find most valuable within Microsoft Azure Cosmos DB are probably the cost, as the cost optimization is good. The storage and queryability are good for what we're doing; it's a lot of unstructured data, so having a platform to put that in and then be able to harvest that data out for the reporting we do is essential. In terms of cost saving, it was probably easily 30 to 40% cheaper than doing a standard SQL, which is what we saw just on piloting and getting in there. We were initially thinking 20 to 25%, but we were probably more at the 35 to 40%. We are using Microsoft Azure Cosmos DB's hybrid search today. The value that it has added to my AI or search workloads is that I think it's optimized that process and made it easier. We have a lot of unstructured data coming from different dissimilar systems and different data sources, so correlating those things together and making sense of it has been very beneficial. Microsoft Azure Cosmos DB has had pretty good performance with searching through large amounts of data; it's been fast, and we haven't seen a lot of performance degradation while building larger queries and bringing in a large set of data. The dynamic auto-scale or serverless model from Microsoft Azure Cosmos DB has helped reduce costs and operational effort; however, it's hard to quantify how that plays out since you're using a shared service. It shifts my focus away from building, managing, and upgrading to adding value.
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Top Industries

By visitors reading reviews
Construction Company
10%
Outsourcing Company
9%
Financial Services Firm
8%
Computer Software Company
8%
Financial Services Firm
11%
Outsourcing Company
11%
Legal Firm
10%
Manufacturing Company
7%
 

Company Size

By reviewers
Large Enterprise
Midsize Enterprise
Small Business
By reviewers
Company SizeCount
Small Business23
Midsize Enterprise16
Large Enterprise24
By reviewers
Company SizeCount
Small Business35
Midsize Enterprise24
Large Enterprise59
 

Questions from the Community

What needs improvement with Amazon RDS?
I think Amazon RDS can be improved or enhanced if it can be implemented with other monitoring tools such as Percona. Currently, I am trying to add Percona monitoring for monitoring in addition to i...
What is your primary use case for Amazon RDS?
Amazon RDS is typically used for AI applications. I am developing it for an AI recruitment agent and for collecting data for HRIS, Software as a Service for a workforce as a service, and storing data.
What is your experience regarding pricing and costs for Microsoft Azure Cosmos DB?
I have knowledge about the pricing, setup cost, and licensing aspect of Microsoft Azure Cosmos DB.
What needs improvement with Microsoft Azure Cosmos DB?
I would see improvements in Microsoft Azure Cosmos DB, particularly concerning integration with more tiers. They should integrate products like IBM Watson for analytics and offer more options for e...
What is your primary use case for Microsoft Azure Cosmos DB?
I have worked with databases like Azure SQL Database, Cosmos DB, and PostgreSQL. We had a migration where our customer wanted solutions like Microsoft Azure Cosmos DB, where they desired high avail...
 

Also Known As

RDS
Microsoft Azure DocumentDB, MS Azure Cosmos DB
 

Overview

 

Sample Customers

Edmodo
TomTom, KPMG Australia, Bosch, ASOS, Mercedes Benz, NBA, Zero Friction, Nederlandse Spoorwegen, Kinectify
Find out what your peers are saying about Amazon RDS vs. Microsoft Azure Cosmos DB and other solutions. Updated: September 2026.
913,924 professionals have used our research since 2012.