Search Engine databases

Lucene-based distributed search and analytics engine for text, vectors, logs and metrics.

Apache-licensed, foundation-governed fork of Elasticsearch for search, vectors and observability.

Hosted search-as-a-service with fast typo-tolerant search, merchandising and AI ranking.

Machine-data indexing and search platform with schema-on-read SPL queries, now owned by Cisco.

The original Lucene search server: battle-tested, Apache-governed, now with GPU-accelerated vectors.

The Java search library at the heart of Elasticsearch, OpenSearch and Solr, now with HNSW vectors.

Microsoft's managed search service for full-text, vector, hybrid and agentic retrieval on Azure.

Developer-friendly Rust search engine with typo tolerance and built-in hybrid semantic search.

In-memory, typo-tolerant search engine in C++ with vector, hybrid and conversational search.

Elasticsearch-quality BM25 search and fast aggregations inside Postgres via the pg_search extension.

Big-data serving engine for search, recommendation and RAG with tensors and ML ranking.

Lucene-inspired full-text search library in Rust, the engine under Quickwit and ParadeDB.

Single-binary Rust observability platform storing logs, metrics and traces as Parquet on object storage.

Tiny TypeScript full-text, vector and hybrid search engine for browsers, servers and the edge.

Log database from the VictoriaMetrics team: schemaless ingestion, LogsQL and low RAM and disk use.

Fast SQL-first search database, forked from Sphinx, with columnar storage and vector KNN.

Mature C++ probabilistic full-text search library with bindings for a dozen languages.

Pure-Go full-text, geo and vector indexing library from Couchbase.

Cloud-native search engine on object storage for logs and traces, built on Tantivy.

Faceted-search and discovery engine (MDEX) that Oracle bought in 2011; now a frozen Oracle Commerce component.

Tiny schema-less Rust search backend that returns object IDs, running in a few MB of RAM.

Veteran C++ full-text search server with SphinxQL, still shipping as Sphinx 3.

Lightweight single-binary full-text search engine in Go with Elasticsearch-compatible ingest.

AWS's original managed search service, closed to new customers since July 2024.

German error-tolerant search and matching engine, now sold for identity resolution and data matching.

Packaged enterprise search and RAG platform built on OpenSearch, with crawlers, connectors and hybrid search.

The in-memory data structure server that became the default cache, now with search, JSON and vectors built in.

The default document database: flexible BSON documents, rich queries and built-in sharding.

Serverless document database with realtime listeners, offline SDKs and a new Enterprise edition.

Open-source retrieval database for AI apps, from embedded Python to serverless Chroma Cloud.

Cloud-native, distributed open-source vector database built for billions of vectors.

Microsoft's globally distributed, multi-API NoSQL and vector database with SLA-backed latency.

HTTP/JSON document database built around multi-master replication and offline-first sync.

Native multi-model database: documents, graphs, search and vectors behind one query language.

Google's globally consistent, horizontally scaling SQL service with graph, vector and full-text built in.

Open-source AI-native vector database with hybrid search, modules for embeddings and multi-tenancy.

IBM's managed, CouchDB-compatible JSON database with built-in search and geospatial queries.

Microsoft's Kusto engine: fast KQL analytics over logs, telemetry and time series at petabyte scale.

ACID document database for .NET and beyond, with auto-indexing, Corax search and multi-master replication.

AWS's managed Valkey, Redis OSS and Memcached service, provisioned or serverless.

Distributed SQL mixing in-memory rowstore and columnstore for real-time analytics, search and vectors.

Rust multi-model database (documents, graph, vectors, live queries) that runs embedded, in WASM or clustered.

Early Java multi-model database mixing documents, graphs and objects, now in patch-only mode.

Memory-first distributed JSON database with SQL++, search, vector indexes and mobile sync.

Embedded, serverless retrieval database on the Lance columnar format for multimodal AI data.

Distributed SQL database built on Lucene for real-time analytics over machine, IoT and JSON data.

Serverless vector and full-text search on object storage, priced for billions of documents.

Reactive TypeScript backend with a transactional document database, server functions and live queries.

Enterprise multi-model database for XML, JSON and RDF with built-in search and semantic RAG.

A multi-threaded, shared-nothing in-memory store that speaks Redis and Memcached on one big box.

Open-source native XML database and XQuery application platform for documents and digital editions.

Lightweight, fast native XML database and XQuery 3.1/4.0 processor with a GUI.

Real-time MPP analytical database with MySQL compatibility, search indexes and lakehouse access.

MongoDB's own multi-cloud DBaaS, bundling search, vector search and stream processing.

Rust observability database that keeps metrics, logs and traces in one columnar engine on object storage.

End-to-end tensor search engine that embeds text and images for you, built on Vespa.

AI-native C++ database for hybrid search over dense, sparse, multi-vector (tensor) and full text.

Managed event and telemetry store with schema-on-read ingest and the piped APL query language.

Enterprise RAG and agent platform with managed hybrid retrieval, reranking and hallucination scoring.

Baidu's MySQL-compatible distributed HTAP database on RocksDB and Raft, with full-text and vector indexes.

Commercial cloud and enterprise distribution of Apache Doris from its core maintainers.

Multi-model database for IoT and observability: time series, full-text, vector and key-value on Parquet.

Redis Ltd.'s own managed Redis on AWS, Azure and GCP, with Active-Active geo-replication and tiering.

Downloadable Spanner that runs on your own servers, other clouds or a laptop, with Paxos and auto-sharding.

Microsoft's managed Redis built on Redis Enterprise, replacing the retiring Azure Cache for Redis.

Fully managed Milvus from its creators, with serverless, dedicated and BYOC deployments.

Couchbase's managed DBaaS: Couchbase Server clusters plus App Services sync and AI tooling.