Fess
Fess: A flexible self-hosted search server for organizations that control their infrastructure and indexed data. Ranked #9 of 25 in AI Enterprise Search Software by our editors (8.5/10); pricing: Free plan; best for self-hosting teams seeking a free search platform.
At a glance
- Editor score8.5 / 10
- PricingFree plan
- Best forSelf-hosting teams seeking a free search platform
- Free planYes
- Paid fromFree
- Permission syncYes
- Facts checked21 Sep 2026
Where it wins
- Crawls websites, files, databases, and data stores
- Supports role- and label-based access controls with SSO integrations
- Optional AI answers include links to cited source documents
Where it doesn't
- Organizations must run and operate the platform on their own infrastructure
- AI search requires an enabled feature and configured LLM provider or plugin
- Broad connector coverage may require configuring multiple data sources
Our verdict on Fess
Fess is an open-source enterprise search server for organizations that want to index and search content on their own infrastructure. It supports websites, file systems, databases, cloud storage, collaboration tools, and other data stores, with a browser-based search interface and administration console. Teams can deploy it using Java or Docker, while retaining control over indexed data. It is best suited to self-hosting teams that need a free search platform with configurable crawling, indexing, permissions, and APIs.
Its platform and ecosystem fit are broad. Fess provides data-store connector plugins for sources such as Box, Dropbox, Google Drive, OneDrive, SharePoint, Confluence, Jira, Slack, Git, Salesforce, Elasticsearch, OpenSearch, MySQL, PostgreSQL, and Oracle. Full-text indexing uses OpenSearch, and REST APIs support search and system integration. Role- and label-based access controls can govern search results, while SAML, Active Directory, and other SSO integrations support identity and access workflows. This combination makes Fess suitable for organizations consolidating search across business, technical, and collaboration content.
The standout differentiator is optional conversational AI search. When enabled and configured with an LLM provider or plugin, it can generate answers from indexed content and include links to source documents. The core product remains useful without that mode through crawling, indexing, browser search, administration tools, and APIs. Fess is a strong fit for teams comfortable operating self-hosted software and configuring connectors, permissions, and identity integrations. Organizations seeking a vendor-managed search service or a deployment model that avoids infrastructure ownership should consider a different type of product.
Your product? Our editors can test Fess in depth and publish a review, labelled as paid · from $149/mo →
Fess pricing
Fess fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Source connectors | Not verified |
| Permission sync | Yes |
| Answer citations | Yes |
| Deployment options | Self-hosted |
| Indexed content limit | Not verified |
| Admin controls | Yes |
| Deployment | Cloud, Self-hosted |
| Platforms | Web, Windows, macOS, Linux |
| Compliance & security | SSO/SAML |
| Support | Community, Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Integrations | 20 integrations: Box, Dropbox, Google Drive, OneDrive, SharePoint, Confluence … See all → |
| Pricing | Free plan |
| Website | fess.codelibs.org |
| Facts checked | 21 Sep 2026 |
Fess integrations
Fess lists 20 integrations on its own site.
- Box
- Dropbox
- Google Drive
- OneDrive
- SharePoint
- Confluence
- Jira
- Slack
- Git
- Salesforce
- Elasticsearch
- OpenSearch
- MySQL
- PostgreSQL
- Oracle
- CSV
- JSON
- SAML
- Active Directory
- OpenAI
Alternatives to Fess
- SinequaA governed search platform for large enterprises with complex information estates.9.4
- Mindbreeze InSpireA broad enterprise search platform for permission-aware answers across complex data estates.9.3
- CoveoA mature enterprise search platform with deep retrieval, personalization, and integration capabilities.9.2
Also Ranked In
Fess is ranked in 2 of our directories.
Used Fess? Be the first to review it
The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Fess for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.
Write a reviewTwo minutes · verified accounts only · read by an editor before it appears
Featured on iTechGuides
Fess is listed in our AI Enterprise Search Software directory. Add the badge to your site — it links back to this page.
<a href="https://www.itechguides.com/products/fess/"><img src="https://www.itechguides.com/best/badge/fess.svg" alt="Featured on iTechGuides" width="230" height="46"></a>
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update