BrightstarDB
BrightstarDB is a native RDF database for the .NET platform.
What BrightstarDB is
BrightstarDB is a native RDF database for the .NET platform. It uses a schema-less RDF model and can run embedded in an application or as a server accessed through a RESTful HTTP API or .NET client API. Its core libraries have a small footprint and install with zero configuration for embedded use. BrightstarDB implements the SPARQL query and update languages and protocol, and supports formats including N-Triples, N-Quads, RDF/XML, Turtle, RDF/JSON, N3, and TriX. For strongly typed .NET applications, its RDF ORM includes a LINQ provider that maps domain-model queries to SPARQL and supports CRUD and querying. Its ORM, LINQ to SPARQL, and dynamic objects API can connect to SPARQL 1.1 endpoints. The append-only store supports queries or reversion to earlier transaction points; periodic coalescing can remove previous points to manage file growth. It uses a single-writer, concurrent-reader model, so reads are not blocked during writes. BrightstarDB is free and licensed under MIT for commercial and non-commercial use. Community support is available through GitHub issues, while commercial support is available from NetworkedPlanet.
Good
- Free, with an MIT license for commercial and non-commercial use.
- Can run embedded or as an API-accessed server.
- Includes a LINQ provider for strongly typed .NET applications.
- Readers can continue while a single writer operates.
Watch out
- Security features are described as basic and customizable.
- Service access controls are a work in progress.
- Server-side shared-secret authentication is not implemented.
Who it suits
BrightstarDB suits .NET developers who need an RDF database with embedded and server deployment options, or who work with SPARQL endpoints.
Verdict
BrightstarDB offers RDF storage, SPARQL support, and .NET-focused querying at no cost. Its documentation describes security controls as limited and still developing, so that should factor into deployment decisions.
The facts
Each one read from BrightstarDB's own pages, with the date it was checked.
What it does
- Authentication
- The documentation says authentication is handled by the host application; IIS Basic or Windows Authentication can protect an IIS-hosted service, while shared-secret authentication is described as not yet implemented on the server.checked 7 Oct 2026
- Concurrency
- BrightstarDB uses a single-writer, concurrent-reader model, and reads are not blocked while writes occur.checked 7 Oct 2026
- Data model
- It uses a schema-less RDF data model for storing and integrating data.checked 7 Oct 2026
- Deployment
- It can run embedded in an application or as a server accessed through a RESTful HTTP API or .NET client API.checked 7 Oct 2026
- Developer APIs
- Its ORM for RDF includes a LINQ provider that maps application domain model queries to SPARQL and supports CRUD and querying in strongly typed .NET applications.checked 7 Oct 2026
- Downloads
- The official site says releases are available through NuGet and GitHub.checked 7 Oct 2026
- Embedded use
- The site says its core libraries have a small footprint and install with zero configuration for embedded applications.checked 7 Oct 2026
- External stores
- Its ORM, LINQ to SPARQL, and dynamic objects API can connect to any endpoint that implements SPARQL 1.1 standards.checked 7 Oct 2026
- License
- The project is licensed under MIT for commercial and non-commercial use.checked 7 Oct 2026
- LINQ and ORM
- Its RDF ORM maps application domain model queries into SPARQL and provides CRUD and query capability for strongly typed .NET applications.checked 7 Oct 2026
- Open source license
- BrightstarDB is licensed under MIT for commercial and non-commercial use.checked 7 Oct 2026
- Other endpoints
- Its ORM, LINQ to SPARQL, and .NET dynamic objects API can connect to SPARQL endpoints implementing SPARQL 1.1 standards.checked 7 Oct 2026
- Product
- BrightstarDB is a native RDF database for the .NET platform.checked 7 Oct 2026
- Queries
- It implements the SPARQL query language, update language, and protocol.checked 7 Oct 2026
- Security
- The documentation describes security features as basic and customizable, and says service access controls are a work in progress.checked 7 Oct 2026
- SPARQL
- It implements the SPARQL query language, update language, and protocol.checked 7 Oct 2026
- Storage behavior
- The append-only store supports querying or reverting to earlier transaction points, while periodic coalescing can manage file growth by removing previous transaction points.checked 7 Oct 2026
- Support
- The official site says community support is available through the GitHub issue tracker and commercial support is available from NetworkedPlanet.checked 7 Oct 2026
Where it runs
- Platforms
- The official site lists Windows, Linux, OSX, Windows Phone, Android, and iOS; the portable library documentation lists .NET 4.5, Silverlight 5, Windows 8, Windows Phone 8.1, Android, iOS, and MonoTouch.checked 7 Oct 2026
Alternatives to BrightstarDB
- 1
Virtuoso Universal Server
Open sourceWebAPILinuxmacOS7.9From $99.99 a year - 2
RDFox
Free planWebAPILinuxmacOS7.8Free plan - 3
Stardog
Free planAndroidiOSWebAPI7.7Free plan - 4
Eclipse RDF4J
Free planOpen sourceWebAPILinuxmacOS7.6Free plan - 5
Apache Jena Fuseki
Free planOpen sourceWebAPILinuxSelf-hosted7.5Free plan - 6
GraphDB
Free planWebAPILinuxmacOS6.6Free plan