Comparison

IBM Db2 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.

IBM Db2 full profile →PostgreSQL full profile →

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IBM Db248

★PostgreSQL60

Attribute comparison across 2 tools
Attribute	IBM Db2	PostgreSQLLeader
Vioscale score	48 / 100low · 17%	60 / 100medium · 56%
Pricing
Free tierpricing.free_tier	✓	✓
Modelpricing.model	freemium	commercial
Price levelpricing.price_level	low	free
Transparentpricing.transparent	✗	-
Integrations
Countintegrations.count	-	10
Security
Disclosure policysecurity.disclosure_policy	✓	✓
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	Available worldwide
Content
Faqcontent.faq	-	8 items

Score

Vioscale score

IBM Db248 / 100low · 17%

PostgreSQL60 / 100medium · 56%

Pricing

Free tier

IBM Db2✓

PostgreSQL✓

Model

IBM Db2freemium

PostgreSQLcommercial

Price level

IBM Db2low

PostgreSQLfree

Transparent

IBM Db2✗

PostgreSQL–

Integrations

Count

IBM Db2–

PostgreSQL10

Security

Disclosure policy

IBM Db2✓

PostgreSQL✓

Scorecard

IBM Db2–

PostgreSQL6.1

Vulnerabilities

IBM Db2–

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

IBM Db2–

PostgreSQL0

Github stars

IBM Db2–

PostgreSQL21,899

Stackoverflow questions

IBM Db2–

PostgreSQL170,000

Activity

Commits last 30d

IBM Db2–

PostgreSQL100

Release

Cadence days

IBM Db2–

PostgreSQL90

License

Spdx

IBM Db2–

PostgreSQLPostgreSQL

Language

Primary

IBM Db2–

PostgreSQLC

Market

Availability

IBM Db2Available worldwide

PostgreSQLAvailable worldwide

Content

Faq

IBM Db2–

PostgreSQL8 items

Capabilities

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

Capability comparison for Relational Databases
Capability	IBM Db2	PostgreSQL
Core
SQL model	Full SQL	Full SQL
Transactions
ACID transactions	-	-
Highest isolation level	-	-
Consistency
Consistency	-	-
Scale
Horizontal scale	Natively distributed	Read replicas
Replication
Replication	-	-
Availability
Automatic failover / HA	-	✓
Deployment
Deployment	Serverless	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	-	Extension

Core

SQL model

IBM Db2Full SQL

PostgreSQLFull SQL

Transactions

ACID transactions

IBM Db2-

PostgreSQL-

Highest isolation level

IBM Db2-

PostgreSQL-

Consistency

IBM Db2-

PostgreSQL-

Scale

Horizontal scale

IBM Db2Natively distributed

PostgreSQLRead replicas

Replication

IBM Db2-

PostgreSQL-

Availability

Automatic failover / HA

IBM Db2-

PostgreSQL✓

Deployment

IBM Db2Serverless

PostgreSQLSelf-hosted

Serverless / scale-to-zero

IBM Db2✓

PostgreSQL✗

Compatibility

Wire compatibility

IBM Db2-

PostgreSQL-

Extensibility

Extensions / plugins / UDFs

IBM Db2-

PostgreSQL✓

Licensing

Licence class

IBM Db2Proprietary

PostgreSQLPermissive OSS

Data types

JSON / document support

IBM Db2✓

PostgreSQL✓

Geo / spatial

IBM Db2-

PostgreSQLExtension

What each one is

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

IBM Db2

IBM Db2 is an AI-powered autonomous database engineered for performance and resilience, delivering near infinite scalability, real-time analytics, and multicloud support for mission-critical workloads.

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.

IBM Db2

Free tier

Free tier available

as of 2026-08-13verify ↗

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	IBM Db2	PostgreSQL
WebPlatforms	✓	✗
WindowsPlatforms	✗	✓
LinuxPlatforms	✗	✓
CLIPlatforms	✓	✓
Cloud / SaaSDeployment	✓	✓
Self-hostedDeployment	✓	✓

Platforms

Web

IBM Db2✓

PostgreSQL✗

Windows

IBM Db2✗

PostgreSQL✓

Linux

IBM Db2✗

PostgreSQL✓

CLI

IBM Db2✓

PostgreSQL✓

Deployment

Cloud / SaaS

IBM Db2✓

PostgreSQL✓

Self-hosted

IBM Db2✓

PostgreSQL✓

Integrations

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

IBM Db2

Not documented yet.

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.