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InterSystems IRIS vs PostgreSQL

InterSystems IRIS: Multi-model data platform (SQL, objects, globals, vectors) with built-in interoperability, big in healthcare. PostgreSQL: The extensible, standards-first open-source relational database.

key differences

  • Licensing: InterSystems IRIS is proprietary (Proprietary commercial license); PostgreSQL is open source (permissive) (PostgreSQL License).
  • InterSystems IRIS is built for larger datasets (≤ 1 PB) than PostgreSQL (≤ 10 TB).
  • Horizontal scaling is native in InterSystems IRIS and addon in PostgreSQL.
  • Only InterSystems IRIS has columnar storage, encryption at rest.
  • Only PostgreSQL has geospatial, change data capture, materialized views, pub/sub, compression.

choose intersystems-iris for

  • +Electronic health records and hospital information systems
  • +Health information exchanges and FHIR servers
  • +High-throughput financial transaction processing
  • +Supply-chain and logistics platforms needing integration plus analytics

best at · OLTP, HTAP, Real-time analytics

choose postgresql for

  • +General-purpose application backend
  • +SaaS multi-tenant data
  • +Geospatial applications with PostGIS
  • +Semantic search alongside relational data with pgvector

best at · OLTP, Geo, Search

InterSystems IRISMulti-model data platform (SQL, objects, globals, vectors) with built-in interoperability, big in healthcare.
PostgreSQLThe extensible, standards-first open-source relational database.
overview
Primary model
Relational
Relational
Also supports
Object, Document, Key-Value, Multivalue (Pick), Vector
Document, Spatial
Type
Database engine
Database engine
Status
Active
Active
Developer
InterSystems Corporation
PostgreSQL Global Development Group
First release
2018
1996
Latest version
2026.2 (CD) (Jul 22, 2026)
18.6 (Aug 13, 2026)
License
ProprietaryProprietary commercial license
Open source (permissive)PostgreSQL License
Free tier
✓
✓
popularity
WhichDB Score
13.3
93.2
Rank
#253
#1
GitHub stars
–
22.6K
Stack Overflow questions
42
178.8K
scale & guarantees
Comfortable data size
Large (≤ 1 PB)
Medium (≤ 10 TB)
Horizontal scaling
Native
Addon
Multi-region
Read replicas
Read replicas
ACID
Full
Full
Consistency
Strong
Strong
Schema
Flexible
Strict
Architecture
Client server, Primary replica, Distributed
Single node, Primary replica, Client server
deployment
Self-hosted
✓
✓
Vendor-managed cloud
✓
—
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
AWS, Azure, Google Cloud
AWS, Google Cloud, Azure, Oracle Cloud, IBM Cloud, Alibaba Cloud
capabilities
Transactions
✓
✓
Joins
✓
✓
Secondary indexes
✓
✓
Full-text search
✓
✓
Vector search
✓
✓
Geospatial
—
✓
JSON
✓
✓
Change data capture
—
✓
Triggers
✓
✓
Stored procedures
✓
✓
Materialized views
—
✓
TTL / expiry
—
—
Pub/Sub
—
✓
Columnar storage
✓
—
In-memory
—
—
Durable persistence
✓
✓
Compression
—
✓
Encryption at rest
✓
—
Role-based access
✓
✓
Time travel
—
—
Branching
—
—
Online schema changes
—
✓
Streaming ingest
—
—
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL, ObjectScript, Python (Embedded)
SQL, PL/pgSQL
Client languages
Java, C#, Python, JavaScript, C++
C, Java, Python, JavaScript, Go, Rust, C#, Ruby
Best for
OLTP, HTAP, Real-time analytics, Vector search
OLTP, Geo, Search, Content
Add more to this comparisonNot sure either fits? Try smart match

InterSystems IRIS vs PostgreSQL: FAQ

What is the difference between InterSystems IRIS and PostgreSQL?

InterSystems IRIS: Multi-model data platform (SQL, objects, globals, vectors) with built-in interoperability, big in healthcare. PostgreSQL: The extensible, standards-first open-source relational database. Licensing: InterSystems IRIS is proprietary (Proprietary commercial license); PostgreSQL is open source (permissive) (PostgreSQL License). InterSystems IRIS is built for larger datasets (≤ 1 PB) than PostgreSQL (≤ 10 TB). Horizontal scaling is native in InterSystems IRIS and addon in PostgreSQL.

When should I choose InterSystems IRIS over PostgreSQL?

Choose InterSystems IRIS for electronic health records and hospital information systems; health information exchanges and FHIR servers; and high-throughput financial transaction processing. Choose PostgreSQL for general-purpose application backend, SaaS multi-tenant data and geospatial applications with PostGIS.

Is InterSystems IRIS or PostgreSQL more popular?

PostgreSQL ranks #1 on the WhichDB Score (93.2/100) and InterSystems IRIS ranks #253 (13.3/100). Popularity is not fit: check the requirements that matter for your project.

Are InterSystems IRIS and PostgreSQL open source?

No. InterSystems IRIS is proprietary, closed-source software. Yes. PostgreSQL is open source. License: PostgreSQL License.