HSQLDB
8.1#2 in relational databasesFrom $100 a yearFree planAPILinuxmacOSSelf-hosted
VisitHSQLDB vs Microsoft SQL Server
Microsoft SQL Server
6.8#12 in relational databasesFree planFree planAPILinuxSelf-hostedWindows
VisitWhat both publish
| Fact | HSQLDB | Microsoft SQL Server |
|---|---|---|
| Free plan | Yes | Yes |
| Integrations | The project documents JDBC and ODBC connectivity and integration with OpenOffice.org and LibreOffice. | SQL Server 2025 integrates with LangChain, Semantic Kernel, Entity Framework Core, Microsoft Azure, and Microsoft Fabric. |
HSQLDB plans
- Developer subscription$100 a year
- Basic Corporate subscription—
- Premier Corporate subscription$2,500 a year
- HSQLDB softwareFree
- HSQLDBFree
- Developer SupportWare$100 a year
Microsoft SQL Server plans
- Standard per core—
- Standard per corePriced on request
- Standard server—
- Standard serverPriced on request
- Standard CALPriced on request
- Standard CAL—
Pick HSQLDB if…
HSQLDB may suit developers and organizations seeking a self-hosted Java database with embedded or server operation. Its listed tools and integrations may also be relevant to teams using the named Java and database projects.
Pick Microsoft SQL Server if…
You want what its maker publishes above — check its page for the details.