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