OpenSearch is a family of software consisting of a search engine (also named OpenSearch), and OpenSearch Dashboards, a data visualization dashboard for that search engine. It is an open-source project developed by the OpenSearch Software Foundation (a Linux Foundation project) written primarily in Java.
As of August 2024, AWS reported that OpenSearch had "tens of thousands" of customers, while Elastic claimed to have over 20,000 subscribers. In the preceding year, OpenSearch had about 50 monthly contributors while ElasticSearch had between 70 and 90.