Cassandra vs PostgreSQL: Key Differences & When to Use Each

Comprehensive side-by-side comparison of features, pricing, and metrics

Key Differences

Compare Cassandra and PostgreSQL across features, pricing, integrations, and community metrics. Cassandra / PostgreSQL.

Feature

Cassandra

Database

PostgreSQL

Database

Side-by-side comparison of developer tools
Highly-scalable distributed database
Advanced open source relational database
GitHub Stars
⭐ 9,733
⭐ 20,800
Contributors
👥 670
👥 58
Pricing
✓ Free
Enterprise: Contact sales
✓ Free
Enterprise: Contact sales
Languages
Java
C
Features
  • • Cassandra
  • • Database
  • • Java
  • • Open Source
  • • database
Integrations
  • • prometheus
  • • postgresql
Momentum Score
89/100 (stable)
28/100 (stable)
Community Health
57/100 (moderate)
19/100 (needs-attention)
Maturity Index
50/100 (emerging)
23/100 (experimental)
Innovation Score
23/100 (traditional)
18/100 (traditional)
Risk Score (higher is safer)
53/100 (low)
14/100 (high)
Developer Experience
21/100 (poor)
13/100 (poor)
Links
🌐 Visit Website View on GitHub
🌐 Visit Website View on GitHub

Cassandra Strengths

  • ✓ Larger community (670 contributors)
  • ✓ More features (3 listed)

PostgreSQL Strengths

  • ✓ More popular (20,800 stars)

When to Use Cassandra vs PostgreSQL

Use Cassandra when its strengths align better with your stack and team needs, and choose PostgreSQL when its ecosystem, integrations, or cost profile is a better fit.

Related comparisons

Cassandra vs Elasticsearch → PostgreSQL vs Elasticsearch → Cassandra vs Redis → PostgreSQL vs Redis → Cassandra vs ClickHouse → PostgreSQL vs ClickHouse → Cassandra vs TiDB → PostgreSQL vs TiDB → Cassandra vs CockroachDB → PostgreSQL vs CockroachDB → Cassandra vs InfluxDB → PostgreSQL vs InfluxDB →

More Comparisons

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Data source: GitHub API

Last updated: 5/4/2026