Comparison

Microsoft SQL Server vs PostgreSQL

On the evidence we track, PostgreSQL leads this comparison with a composite score of 60/100. Scores are only directly comparable because these tools share a category; the full breakdown and every source is below.

Microsoft SQL Server full profile →PostgreSQL full profile →

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Microsoft SQL Server23

★PostgreSQL60

Attribute comparison across 2 tools
Attribute	Microsoft SQL Server	PostgreSQLLeader
Vioscale score	23 / 100low · 7%updating	60 / 100medium · 56%updating
Pricing
Free tierpricing.free_tier	-	✓
Modelpricing.model	commercial	commercial
Price levelpricing.price_level	-	free
Integrations
Countintegrations.count	3	10
Security
Disclosure policysecurity.disclosure_policy	✓	✓
Gdprsecurity.gdpr	✓	-
Scorecardsecurity.scorecard	-	6.1
Vulnerabilitiessecurity.vulnerabilities	-	Count: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=helm&package_name=openstack-helm%2Fpostgresql&per_page=100 · Last 12m: 0
Adoption
Dependent reposadoption.dependent_repos	-	0
Github starsadoption.github_stars	-	21,899
Stackoverflow questionsadoption.stackoverflow_questions	-	170,000
Activity
Commits last 30dactivity.commits_last_30d	-	100
Release
Cadence daysrelease.cadence_days	-	90
License
Spdxlicense.spdx	-	PostgreSQL
Language
Primarylanguage.primary	-	C
Market
Availabilitymarket.availability	Available worldwide · HQ US	Available worldwide
Content
Faqcontent.faq	-	8 items

Score

Vioscale score

Microsoft SQL Server23 / 100low · 7%updating

PostgreSQL60 / 100medium · 56%updating

Pricing

Free tier

Microsoft SQL Server–

PostgreSQL✓

Model

Microsoft SQL Servercommercial

PostgreSQLcommercial

Price level

Microsoft SQL Server–

PostgreSQLfree

Integrations

Count

Microsoft SQL Server3

PostgreSQL10

Security

Disclosure policy

Microsoft SQL Server✓

PostgreSQL✓

Gdpr

Microsoft SQL Server✓

PostgreSQL–

Scorecard

Microsoft SQL Server–

PostgreSQL6.1

Vulnerabilities

Microsoft SQL Server–

PostgreSQLCount: 0 · Source: https://advisories.ecosyste.ms/api/v1/advisories?ecosystem=helm&package_name=openstack-helm%2Fpostgresql&per_page=100 · Last 12m: 0

Adoption

Dependent repos

Microsoft SQL Server–

PostgreSQL0

Github stars

Microsoft SQL Server–

PostgreSQL21,899

Stackoverflow questions

Microsoft SQL Server–

PostgreSQL170,000

Activity

Commits last 30d

Microsoft SQL Server–

PostgreSQL100

Release

Cadence days

Microsoft SQL Server–

PostgreSQL90

License

Spdx

Microsoft SQL Server–

PostgreSQLPostgreSQL

Language

Primary

Microsoft SQL Server–

PostgreSQLC

Market

Availability

Microsoft SQL ServerAvailable worldwide · HQ US

PostgreSQLAvailable worldwide

Content

Faq

Microsoft SQL Server–

PostgreSQL8 items

Capabilities

Feature-by-feature on the axes that matter for relational databases. “-” means undocumented, not absent.

Capability comparison for Relational Databases
Capability	Microsoft SQL Server	PostgreSQL
Core
SQL model	Full SQL	Full SQL
Transactions
ACID transactions	Full	-
Highest isolation level	-	-
Consistency
Consistency	-	-
Scale
Horizontal scale	-	Read replicas
Replication
Replication	-	-
Availability
Automatic failover / HA	-	✓
Deployment
Deployment	-	Self-hosted
Serverless / scale-to-zero	-	✗
Compatibility
Wire compatibility	-	-
Extensibility
Extensions / plugins / UDFs	-	✓
Licensing
Licence class	Proprietary	Permissive OSS
Data types
JSON / document support	✓	✓
Geo / spatial	Native	Extension

Core

SQL model

Microsoft SQL ServerFull SQL

PostgreSQLFull SQL

Transactions

ACID transactions

Microsoft SQL ServerFull

PostgreSQL-

Highest isolation level

Microsoft SQL Server-

PostgreSQL-

Consistency

Microsoft SQL Server-

PostgreSQL-

Scale

Horizontal scale

Microsoft SQL Server-

PostgreSQLRead replicas

Replication

Microsoft SQL Server-

PostgreSQL-

Availability

Automatic failover / HA

Microsoft SQL Server-

PostgreSQL✓

Deployment

Microsoft SQL Server-

PostgreSQLSelf-hosted

Serverless / scale-to-zero

Microsoft SQL Server-

PostgreSQL✗

Compatibility

Wire compatibility

Microsoft SQL Server-

PostgreSQL-

Extensibility

Extensions / plugins / UDFs

Microsoft SQL Server-

PostgreSQL✓

Licensing

Licence class

Microsoft SQL ServerProprietary

PostgreSQLPermissive OSS

Data types

JSON / document support

Microsoft SQL Server✓

PostgreSQL✓

Geo / spatial

Microsoft SQL ServerNative

PostgreSQLExtension

What each one is

The product in its own terms, so the numbers below have context.

Microsoft SQL Server

SQL Server 2025 is a commercial database platform that enables organizations to store, query, and analyze data while incorporating built-in AI capabilities. It supports multiple programming languages and deployment options ranging from on-premises installations to cloud-based managed services.

Independently observed

PostgreSQL

Leader

PostgreSQL is a mature open-source relational database system combining strong data integrity with comprehensive features and active community maintenance.

Independently observed

Pricing

List pricing as published by each vendor, with the date we read it. Always verify at the source before you buy.

Microsoft SQL Server

Pricing not documented yet.

PostgreSQL

Leader

Open sourceFree tier

as of 2026-08-14verify ↗

Platform & deployment

Where each product runs and how it can be hosted. A dash means undocumented, not unsupported.

Platform and deployment support comparison
Supports	Microsoft SQL Server	PostgreSQL
WindowsPlatforms	-	✓
LinuxPlatforms	-	✓
CLIPlatforms	-	✓
Cloud / SaaSDeployment	✓	✓
Self-hostedDeployment	✓	✓

Platforms

Windows

Microsoft SQL Server–

PostgreSQL✓

Linux

Microsoft SQL Server–

PostgreSQL✓

CLI

Microsoft SQL Server–

PostgreSQL✓

Deployment

Cloud / SaaS

Microsoft SQL Server✓

PostgreSQL✓

Self-hosted

Microsoft SQL Server✓

PostgreSQL✓

Integrations

What each product connects to. Counts come from the vendor's own integration directory where one exists.

Microsoft SQL Server

3 total

LangChain
Semantic Kernel
Entity Framework Core

Independently observed

PostgreSQL

Leader

10 total

CloudNativePG
Kubernetes
Patroni
pgAdmin
pgVector
PostGIS
pgAudit
Spock
Cilium
Submariner

Independently observed

Comparison generated from independently-sourced facts. Every value links to its source and retrieval date. See the method.