PostgreSQL vs MySQL

Which Database Should You Choose in 2026?

PostgreSQL vs MySQL, the two leading open-source relational databases, compared for SaaS and data-heavy web apps in 2026: features, performance, JSON support, extensibility, and replication. We cover when PostgreSQL's advanced features win, and when MySQL's ecosystem compatibility still makes it the pragmatic pick.

Type
Object-Relational DBMS
Relational DBMS
Best For
Complex queries, analytics, GIS
Read-heavy web apps, CMS
ACID Compliance
Full
Full (InnoDB)
JSON Support
Native JSONB with indexing
Basic JSON type
Extensibility
Very High (custom types, extensions)
Moderate
Replication
Streaming & Logical
Built-in (Group Replication)
Our Pick For
SaaS, fintech, data-heavy apps
Content platforms, e-commerce

Our Verdict

PostgreSQL is our default choice for most new projects thanks to its advanced features, standards compliance, and extensibility. MySQL remains a solid pick for read-heavy workloads and when ecosystem compatibility (e.g., WordPress, legacy systems) is a priority.

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