The best Search Server alternative to OpenSearch is Algolia. It's not free, so if you're looking for a free alternative, you could try Algolia or Elasticsearch. If that doesn't suit you, our users have ranked more than 25 alternatives to OpenSearch and 11 are Search Servers so hopefully you can find a suitable replacement. Other interesting Search Server alternatives to OpenSearch are Sphinx (search engine), Searchcraft, Apache Lucene and RediSearch.
Algolia helps product teams connect their users with information by providing the building blocks they need to create fast, relevant, personalized search.
Unmatched relevance. Real-time insights. Anything is possible — when the precision of search meets the intelligence of AI.
Solr is an open source enterprise search server based on Lucene search library, with XML/HTTP and JSON APIs. Its major features include powerful full-text search, hit highlighting, faceted search, dynamic clustering, database integration, and rich document handling.
Sphinx is a software search engine designed with indexing database content in mind. It currently supports MySQL, PostgreSQL, and ODBC-compliant databases as data sources natively. Other data sources can be indexed via pipe in a custom XML format.
Searchcraft is a highly performant, content-optimized search engine written in Rust. It has lower resource footprint than Elasticsearch with faster response times. It aims to be faster, easier to implement, and easier to manage than Elasticsearch, OpenSearch, Agolia and Solr...
High-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform. Apache Lucene is a open source.
Redisearch implements a search engine on top of Redis, but unlike other Redis search libraries, it does not use internal data structures like sorted sets.
OpenSearchServer is an open source application server allowing development of index-based applications like search engines. Main features of OpenSearchServer are : An integrated crawler for databases, web pages and rich documents; a user friendly GUI allowing development of most...
SearchBlox is an out-of-the-box Enterprise Search Solution built on top of Apache Lucene/Solr. It is fast to deploy, easy to manage and available for both on-premise and cloud deployment.
Simplify how agents connect to enterprise data. Build high-impact AI apps with one centralized solution for agentic retrieval-augmented generation (RAG) workflows.
ParadeDB is a modern Elasticsearch alternative built on Postgres. Built for real-time, update-heavy workloads.
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