# YaCy

Java search engine server with a built-in web crawler and web interface, usable for a private index or in a peer-to-peer search network.


Source: https://findsoftware.frbit.cloud/yacy/
Last reviewed: 2026-10-28
Listed since: 2026-10-28

## Record

### Links

- home: https://yacy.net
- repository: https://github.com/yacy/yacy_search_server
- docs: https://yacy.net/docs/
- x: https://twitter.com/yacy_search
- mastodon: https://sigmoid.social/@orbiterlab
- forum: https://community.searchlab.eu

### Identity

- status: active
- maintainer: Michael Christen
- maintainerType: unknown
- parent: unknown
- firstRelease: 2010
- hqCountry: unknown

### Kind

- category: search
- hosting: java
- language: java
- runtime: jvm
- runtimeMin: jvm 17
- basedOn: unknown

### Content

- contentStore: not applicable
- databases: not applicable
- adminUi: not applicable
- headlessApi: not applicable
- templating: not applicable
- i18n: not applicable

### Rendering and deploy

- runsAs: always-on
- renderingModes: not applicable
- installMethod: windows installer

### License

- licenseModel: open-source
- license: GPL-2.0-or-later, LGPL

### Releases

- currentMajor: 1
- latestReleaseDate: 2026-03-29

### Adoption

- githubStargazers: 4084
- packagistDownloads: not applicable
- npmWeeklyDownloads: not applicable
- contributors: 79
- pluginCount: unknown
- packagistMonthlyDownloads: unknown
- ecosystemsMonthlyDownloads: unknown
- httpArchiveSites: unknown
- wordpressActiveInstalls: unknown
- dependentRepos: unknown
- dependentPackages: unknown

### Sources

- urls: https://yacy.net/ (read 2026-10-28)
- urls: https://api.github.com/repos/yacy/yacy_search_server (read 2026-10-28)
- urls: https://yacy.net/ (read 2026-10-28)
- maintainer: https://github.com/yacy/yacy_search_server (read 2026-10-28)
- language: https://api.github.com/repos/yacy/yacy_search_server (read 2026-10-28)
- runtime: https://github.com/yacy/yacy_search_server (read 2026-10-28)
- runtimeMin: https://github.com/yacy/yacy_search_server (read 2026-10-28)
- category: https://github.com/yacy/yacy_search_server (read 2026-10-28)
- license: https://github.com/yacy/yacy_search_server (read 2026-10-28)
- license: https://github.com/yacy/yacy_search_server (read 2026-10-28)
- runsAs: https://github.com/yacy/yacy_search_server (read 2026-10-28)
- installMethod: https://yacy.net/download_installation/ (read 2026-10-28)
- installMethod: https://yacy.net/download_installation/ (read 2026-10-28)
- installMethod: https://yacy.net/download_installation/ (read 2026-10-28)
- installMethod: https://yacy.net/download_installation/ (read 2026-10-28)
- installMethod: https://yacy.net/download_installation/ (read 2026-10-28)
- currentMajor: https://api.github.com/repos/yacy/yacy_search_server/git/refs/tags/Release_1.941 (read 2026-10-28)
- latestReleaseDate: https://api.github.com/repos/yacy/yacy_search_server/git/refs/tags/Release_1.941 (read 2026-10-28)
- firstRelease: https://api.github.com/repos/yacy/yacy_search_server/git/refs/tags/0.99 (read 2026-10-28)
- githubStargazers: https://api.github.com/repos/yacy/yacy_search_server (read 2026-10-28)
- contributors: https://api.github.com/repos/yacy/yacy_search_server/contributors?per_page=1 (read 2026-10-28)

## Notes

YaCy is a search engine server written in Java that combines a web crawler, a search index and a web interface in one application. Its [download page](https://yacy.net/download_installation/) offers packaged installers for Windows, macOS and Linux, a build from its git sources with ant, and an official Docker image.

## Worth knowing

A new installation joins a peer-to-peer search network by default, in which peers share index data. The README says the mode can be changed in the web interface, and that a search can be limited to the local index, in which case results come only from that index.

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Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Attributes are recorded, never scored; absent means unknown.
Credit, in full: FindSoftware, CC BY 4.0