QLever vs RedStore

QLever is an open-source graph database for loading and querying large RDF datasets. It implements SPARQL 1.1, including federated queries, named graphs, the Graph Store HTTP Protocol, and updates. The project says it can handle more than a trillion triples on a single commodity machine. It also provides text search over knowledge bases, context-sensitive SPARQL autocompletion, live query analysis, and spatial queries with interactive maps of large sets of geometric objects. QLever can run embedded inside C++ code without a client-server setup. Example datasets include Wikidata, Wikimedia Commons, OpenStreetMap, UniProt, PubChem, and DBLP. It is self-hosted, with official packages for Debian, Ubuntu, Ubuntu-derived distributions, and macOS, plus Docker and Podman images. The official Homebrew package supports ARM64 Apple Silicon Macs, not Intel Macs. Windows use runs Docker inside a virtual machine and may incur significant performance and RAM costs; binary releases are in progress. QLever is free under the Apache 2.0 license.

RedStore is a free, self-hosted RDF triplestore written in C with the Redland library. It provides a built-in HTTP server and interface for loading and querying RDF data. Supported standards include SPARQL 1.0 Query, SPARQL 1.1 Protocol for RDF, SPARQL 1.1 Graph Store HTTP Protocol, and SPARQL 1.1 Service Description. The project describes support for a wide range of RDF formats, including Turtle. Storage modules can use hashes, MySQL, memory, PostgreSQL, SQLite, or Virtuoso when contexts are supported; hashes is the default. A URI can be loaded at startup, or RDF files can be sent with HTTP PUT. The /sparql endpoint works with the SPARQL Query Tool, and rdfproc supports offline operations. Redland is the only listed runtime dependency, with minimum versions for raptor2, rasqal, and redland. Installation uses configure, make, and make install. RedStore runs on Linux and macOS, offers API use, and has a Mac OS X app.