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Head-to-head · Embedded Databases

H2 Database Engine vs HSQLDB

  • Updated Oct 2026
  • Both researched from official sources
  • 1 check side by side
Higher score H2 Database Engine #2 in Embedded Databases 9.1/10 Free plan Free plan✓ 0 of 2 features Visit site
HSQLDB #4 in Embedded Databases 8.8/10 Free plan Free plan✓ 0 of 2 features Visit HSQLDB

H2 Database Engine leads on 0 checks, HSQLDB on 0, and 1 is even. Who comes out ahead on the 1 yes/no, price and count check where we have data for both products. The editor score weighs everything else too.

Our verdict

  • Highest scoreH2 Database Engine · 9.1/10
  • Free planboth

H2 Database Engine scores higher on our rubric for embedded databases: 9.1 against 8.8 out of 10; our editors rank them #2 and #4.

H2 Database Engine is the better fit for java applications needing embedded SQL. HSQLDB is the better fit for feature-rich embedded SQL systems.

  • H2 Database Engine fits best

    Java applications needing embedded SQL

  • HSQLDB fits best

    Feature-rich embedded SQL systems

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Side by side

Feature H2 Database Engine 9.1/10 Visit ↗ HSQLDB 8.8/10 Visit ↗
At a glance
Editor score 9.1 8.8
Ranking #2 in Embedded Databases #4 in Embedded Databases
Best for Java applications needing embedded SQL Feature-rich embedded SQL systems
Pricing model Free Free plan + paid
Starting price Free plan $100/yr
Free plan ✓ ✓
Free trial — —
Deployment Self-hosted, Desktop Self-hosted
Support Community, Docs Community, Docs
Built for Solo, Small business Solo, Small business, Mid-market
Features H2 Database Engine 0/2 · HSQLDB 0/2
Encryption Not checked yet Not checked yet
Data synchronization Not checked yet Not checked yet
Specs
Supported platforms Not checked yet Not checked yet
Database model Not checked yet Not checked yet
Query interface Not checked yet Not checked yet
Maximum database size Not checked yet Not checked yet
Our review
Pros
  • Supports embedded, client/server, mixed, disk-based, and in-memory modes
  • JDBC support plus integrations with Hibernate and PostgreSQL client protocol
  • Includes encryption, clustering, transactions, and SQL-based backup commands
  • Supports embedded and client-server operating modes
  • Offers SQL:2023, MVCC, 2PL, and hybrid transaction models
  • Includes backups, versioned tables, and replication synchronization
Cons
  • ODBC support is partial rather than full
  • Self-hosted deployment requires managing the database environment
  • Its strongest fit is Java-focused rather than broad application stacks
  • Self-hosted deployment requires environment management
  • JDBC and ODBC are the listed connectivity options
  • Optional SupportWare subscriptions add a separate support cost
Our verdict

H2 Database Engine is an open-source relational SQL database written in Java. It is designed for Java applications that need embedded SQL, while also supporting client/server and mixed connection modes. Teams can run disk-based or…

Read the review →

HSQLDB, also known as HyperSQL, is an open-source relational database management system written in Java. It is aimed at Java developers building database-backed applications for development, testing, and deployment. Its embedded and…

Read the review →
  1. H2 Database EngineEmbedded Databases 9.1Free plan
  2. HSQLDBEmbedded Databases 8.8Free plan

Strengths and trade-offs

  • H2 Database Engine — where it wins

    • Supports embedded, client/server, mixed, disk-based, and in-memory modes
    • JDBC support plus integrations with Hibernate and PostgreSQL client protocol
    • Includes encryption, clustering, transactions, and SQL-based backup commands

    Where it doesn't

    • ODBC support is partial rather than full
    • Self-hosted deployment requires managing the database environment
    • Its strongest fit is Java-focused rather than broad application stacks

  • HSQLDB — where it wins

    • Supports embedded and client-server operating modes
    • Offers SQL:2023, MVCC, 2PL, and hybrid transaction models
    • Includes backups, versioned tables, and replication synchronization

    Where it doesn't

    • Self-hosted deployment requires environment management
    • JDBC and ODBC are the listed connectivity options
    • Optional SupportWare subscriptions add a separate support cost
  • H2 Database Engine9.1/10 · Free plan

    A flexible embedded SQL engine for Java applications, with self-hosted server options.

    Visit siteFull verdict →
  • HSQLDB8.8/10 · Free plan

    A feature-rich, self-hosted SQL database for Java applications.

    Visit HSQLDBFull verdict →

More comparisons

All embedded databases comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update