Query Streams
7.7#3 in data virtualization softwareFrom $15 a monthFree planWebAPILinuxmacOS
VisitQuery Streams vs Virtuoso Universal Server
Virtuoso Universal Server
7.9#1 in knowledge graph softwareFrom $99.99 a yearWebAPILinuxmacOS
VisitWhat both publish
| Fact | Query Streams | Virtuoso Universal Server |
|---|---|---|
| Company headquarters | LinkedIn lists the headquarters as Memphis, Tennessee, United States. | LinkedIn lists OpenLink Software headquarters in Needham, Massachusetts, with 11–50 employees and a 1992 founding year. |
| Documentation depth | The documentation includes step-by-step Windows, macOS and Linux installation, troubleshooting, connector setup and MCP connection guides. | Official documentation includes manuals and wiki material for Virtuoso, the open-source edition, the Virtuoso Authentication Layer, and Java provider APIs. |
| Federated queries | Federated SQL can join data from multiple connected databases without first exporting or copying the source data. | SQL, SPARQL, and XQuery/XPath queries can run across remote SQL, RDF, XML, and web-service sources. |
| Founded | LinkedIn lists Query Streams as founded in 2025. | 1992 |
| License | The service and Agent are proprietary commercial software licensed for internal business use; the terms prohibit copying, modification, reverse engineering and redistribution. | Virtuoso Open-Source Edition is licensed under GNU GPL version 2; commercial editions use proprietary licensing. |
| Security | The Network Agent initiates an encrypted outbound connection, requires no inbound ports or VPN, and enforces SELECT, WITH, and EXPLAIN-only queries; database credentials stay on the user's network. | The maker describes fine-grained attribute-based access controls and lists encryption at rest as a commercial feature. |
| Support | The site provides a contact form for questions and links to its documentation archive. | Commercial support can include bug fixes, feature enhancements, performance tuning, and consulting, with specifics depending on the agreement. |
Query Streams plans
- FreeFree
- Personal Core$15 a month
- Personal Plus$30 a month
- Business Core$50 a month
Virtuoso Universal Server plans
- Personal$99.99 a year
- Developer$199 a year
- Project$499 a year
- EnterprisePriced on request
Pick Query Streams if…
It suits teams that want to share governed database and API results with spreadsheet users, AI clients or scheduled integrations. The Free tier may fit limited query traffic; larger needs can use paid plans starting at $15 a month.
Pick Virtuoso Universal Server if…
You want what its maker publishes above — check its page for the details.