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Fess vs Amgix: catalog facts
Fess	Amgix
Free Free and open source under Apache-2.0; commercial support is available.	Free Free and open source under AGPL-3.0.
Windows, macOS, Linux, Web, Self-hosted	Self-hosted
Crawler, indexer, admin console and search UI included Indexes Office, PDF and archive files from many sources	Single REST API for ingestion, embedding and hybrid retrieval Server-side fusion of dense, sparse and keyword search
Non-Docker installs need a separate OpenSearch setup Requires Java 21 and server resources	Young project with a very small community Aimed at developers integrating search, not end users
Downloadable app, Self-hosted	Self-hosted
Open source	Open source
License: Apache-2.0	License: AGPL-3.0
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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