AllegroGraph vs RedStore

AllegroGraph is a persistent graph database for RDF triples and quads, generic graphs, and vectors, using disk-based storage and efficient memory utilization. It supports SPARQL, RDFS++ reasoning, and Prolog, plus geospatial and temporal reasoning, social network analysis, native data types, and range queries. The database is ACID-compliant and includes online backups, point-in-time recovery, replication, and warm standby. It can integrate with large language models and store embedding vectors in a vector database. Security features include role-based permissions, repository access controls, security filters, and triple-level controls using attributes. LDAP and OAuth/OIDC authentication are supported, with TLS for client connections; the security overview recommends third-party tools for encryption at rest. Clients include Java, Python, and Lisp, alongside REST and browser-based WebView access. The server runs natively on x86-64 Linux, with documented Docker, Windows Subsystem for Linux, virtual machine, and cloud options. The free edition costs nothing, has no expiration or license key requirement, and allows up to 5,000,000 triples.

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.