OpenSearch
Top pickThe Apache-2.0 search and log-analytics platform (the Elasticsearch fork).
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sovereigntyOpenSearch is a community-driven fork of Elasticsearch and Kibana, kept under the Apache-2.0 license. It ingests, indexes, and searches logs and events at scale, with dashboards and a security-analytics plugin for SIEM use — the closest open feature parity to Splunk's core.
OPEN SOURCEApache-2.0SELF-HOSTLOCAL-FIRST
LicenseApache-2.0
PricingFree / self-host; managed options available from AWS and others
Open sourceYes
Self-hostableYes
Local-first dataYes
What it does well
- +Truly open (Apache-2.0), no source-available or field-of-use restrictions
- +Closest feature parity to Splunk — search, dashboards, and a SIEM plugin
- +Large ecosystem inherited from the Elasticsearch/Kibana lineage
Where it falls short
- −Cluster operations (sharding, JVM tuning) have a real learning curve
- −Resource-hungry at large data volumes
- −Different query language — not a drop-in for Splunk's SPL
OpenSearch as an alternative to
Where OpenSearch shows up in our comparisons, and how it ranked.
OpenSearch head-to-head
Straight comparisons against the tools people weigh it against.