QLeverize Your Data

The New Era of Knowledge Graphs: Fast, Scalable, and Easy to Use

QLever is a powerful open-source graph database and RDF triplestore that allows you to load and query hundreds of billions of facts on a single commodity machine, delivering unprecedented performance. QLever’s SPARQL frontend offers intuitive autocompletion and real-time term lookup, making it easier than ever to work with knowledge graphs.

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Why Choose QLever?

QLever delivers fast query performance, handling smaller queries in milliseconds and completing complex ones on massive datasets in seconds.
Whether working with millions or billions of triples, QLever scales seamlessly, managing large datasets with ease.
Save on hardware and cloud costs with QLever’s efficient design, which performs exceptionally well without clusters or specialized setups.
Trusted by global projects like Wikidata, UniProt, PubChem, OpenStreetMap, and Dblp.
Full SPARQL 1.1 support, GeoSPARQL for spatial queries, and integrated full-text search make QLever a powerful choice.
While QLever is fully open-source, we offer commercial licenses for high availability, scaling, private issue tracking, and premium support.
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Licensing and Support Options

Free (Open Source)

Fully feature-complete and free to use. Community support available via GitHub for bug reports and general advice.

No assistance for query optimization or internal system debugging

Standard Support

Perfect for organizations starting with QLever or expanding datasets and query demands. Ideal for moderate workloads with growing scalability needs.

Basic support, private issue tracking, quality-assured binaries

Enterprise Support

Perfect for large-scale knowledge graphs requiring continuous response times and extensive query capacity.

Priority support, feature requests, private issue tracking

Other Services

Infrastructure Options

  • Single-Server Setup: Advanced cost-effective solution for small to medium datasets with optimized performance.
  • High Availability (HA): Robust continuous operation with intelligent failover and advanced redundancy protocols.
  • Large-Scale Deployments: Enterprise-grade multi-machine architecture maximizing availability and throughput.

Service Level Agreements

Precision-engineered SLAs tailored to your operational requirements:

  • Guaranteed ultra-responsive service times
  • Comprehensive 99.99% uptime commitments
  • 24/7 mission-critical enterprise support

QLever Managed Service

Seamless cloud-native deployment with comprehensive managed services. Pre-configured datasets include:

  • UniProt Biological Database
  • PubChem Chemical Information
  • Wikidata Open Knowledge Graph
  • OpenStreetMap Geospatial Data

Embedded Environments

Precision-engineered for extreme efficiency in constrained environments:

  • Ultra-low memory consumption
  • High-performance CPU optimization
  • Specialized for automotive, medical tech

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Our expert team

John Doe

Creative Designer


Jonathon

Graphic Designer


Adam Smith

Web Designer


Abraham

Product Designer


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