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Understand the differences before you shortlist.

Cassandra×

PostgreSQL×

Attribute	CassandraOpen source	PostgreSQLOpen source
Overview
Primary focus	Masterless, wide-column NoSQL database built for multi-datacenter availability	Open-source object-relational database with strong SQL compliance and extensibility
Deployment	Self-hosted	Self-hosted
Source model	Open source	Open source
Pricing model	open source	open source
API available	Yes	Yes
Windows desktop	Not specified	Yes
Mobile app	Not specified	Not specified
Overview	Apache Cassandra is an open-source, peer-to-peer NoSQL database that replicates data across nodes and datacenters with tunable consistency and no single point of failure.	PostgreSQL is a free, open-source relational database supporting advanced SQL, native JSON storage, and extensions such as PostGIS and pgvector, maintained by a global community rather than a single vendor.
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Vendor website	Visit vendor ↗	Visit vendor ↗
ITHub profile	View full profile →	View full profile →

Primary focus: Masterless, wide-column NoSQL database built for multi-datacenter availability
Deployment: Self-hosted
Source model: Open source
Pricing model: open source
API available: Yes
Windows desktop: Not specified
Mobile app: Not specified
Overview: Apache Cassandra is an open-source, peer-to-peer NoSQL database that replicates data across nodes and datacenters with tunable consistency and no single point of failure.

Primary focus: Open-source object-relational database with strong SQL compliance and extensibility
Deployment: Self-hosted
Source model: Open source
Pricing model: open source
API available: Yes
Windows desktop: Yes
Mobile app: Not specified
Overview: PostgreSQL is a free, open-source relational database supporting advanced SQL, native JSON storage, and extensions such as PostGIS and pgvector, maintained by a global community rather than a single vendor.

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