Npgsql review
A PostgreSQL-focused .NET driver that pools connections inside each application.
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Npgsql is an open-source ADO.NET data provider for applications written in .NET that connect to PostgreSQL. It suits teams building solo, small, mid-market, or enterprise applications that want connection pooling within the application process. Disposing a connection returns its underlying physical connection to an internal pool, where it can be reused. PostgreSQL commands and transactions are available through ADO.NET APIs, while Entity Framework Core integration supports applications using that ecosystem.
Pooling is enabled by default, and connection-string parameters control minimum and maximum pool sizes, idle lifetime, and total connection lifetime. The published configuration uses a default maximum pool size of 100, while the limit remains adjustable. Connection multiplexing can improve use of available connections, and multi-host connections add failover and load-balancing options. Bulk import and export APIs extend the provider beyond basic query access. As a self-hosted library, Npgsql fits deployments that keep database connectivity logic alongside application code rather than operating a separate connection service.
The main boundary is architectural: Npgsql's pool is local to each application and is not a standalone pooling server. Its documented pooling modes are session connection pooling and connection multiplexing; transaction pooling is not an Npgsql mode. PostgreSQL is the supported database, so teams needing one pooler across different database engines or a centralized pooler should consider a separate product. Community support and documentation are the listed support channels. Choose Npgsql when a .NET application needs PostgreSQL connectivity with built-in pooling and EF Core support; choose an alternative when centralized pooling or broader database coverage is required.
Npgsql pros and cons
- Where it wins
- Pooling is enabled by default with configurable pool limits and lifetimes
- Multiplexing, failover, and load balancing support multi-host PostgreSQL use
- ADO.NET transactions, bulk I/O, and Entity Framework Core integration included
- Where it doesn't
- Embedded pooling does not provide a standalone pooler service
- Supports PostgreSQL rather than multiple database engines
- Transaction pooling is not an Npgsql pooling mode
Npgsql fact sheet, pricing and score →
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