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Apache Solr vs Sonic: catalog facts
Apache Solr	Sonic
Free Free and open source from the Apache Software Foundation.	Free Free and open source under the Mozilla Public License 2.0.
Windows, macOS, Linux, Self-hosted	Linux, Self-hosted
Full-text, vector and geospatial search in one server Distributed indexing, replication and failover	Very low memory use compared with Elasticsearch Schema-less, with no index mapping to define
Requires server administration and tuning Aimed at developers rather than end users	Returns identifiers, not stored documents, so a separate database is needed Uses its own protocol rather than a familiar HTTP API
Self-hosted	Self-hosted
Open source	Open source
License: Apache-2.0	License: MPL-2.0
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.