Yacy Start


Yacy Start is a free search engine that anyone can use to build a search portal for their intranet or to help search the public internet. When contributing to the world-wide peer network, the scale of YaCy is limited only by the number of users in the world and can index billions of web pages. It is fully decentralized, all users of the search engine network are equal, the network does not store user search requests and it is not possible for anyone to censor the content of the shared index.

We want to achieve freedom of information through a free, distributed web search which is powered by the world’s users.



Imagine if, rather than relying on the proprietary software of a large professional search engine operator, your search engine was run by many private computers which aren’t under the control of any one company or individual. Well, that’s what Yacy Start does! The resulting decentralized web search currently has about 1.4 billion documents in its index (and growing – download and install YaCy to help out!) and more than 600 peer operators contribute each month. About 130,000 search queries are performed with this network each day.

Topic-Oriented Search and Search Engine for Projects

Yacy Start can operate as a single search appliance without networking with other peers. Such a search instance can be used for:

  • Search for projects – a combination of wikis, forums and websites

  • Topic-oriented search engine – combine a search for several web pages from different domains into a single search portal.

  • Companies can host their own search engine in order to help guard company secrets (a company may give away secrets with the search words employees submit to a search portal).

  • Yacy Start helps to preserve your anonymity when searching

Your own search portal!

If you run a Yacy Start peer, you have your own search engine. You can use it either to provide search functionality for your own search portal, or you can join a community of search engine peers to share your web index with the web index of other Yacy Start peer owners. If you search with Yacy Start your search requests are anonymous because they go to your computer and not to a central search portal server. No central server can log your searches.

Integration of a search window in your own web pages

Yacy Start provides simple code snippets to support the integration of Yacy Start search into your own web pages. There is also a search widget (pops up on your web pages if you like that) and demonstration snippets are provided by the Yacy Start administration interface. You only need to copy-paste the code into your pages.

Privacy and Security

  • Your private search requests are never stored, monitored or evaluated for commercial purposes.

  • If you are searching for terms related to product development and innovation, you can potentially give away information about your company activities. To maintain your business secrets, you need your own search engine (which can easily be created with YaCy).



cyborg@cyborg:~$ sudo yacy-start
[sudo] password for cyborg: 
****************** YaCy Web Crawler/Indexer & Search Engine *******************
**** (C) by Michael Peter Christen, usage granted under the GPL Version 2  ****
****   USE AT YOUR OWN RISK! Project home and releases: http://yacy.net/   ****
**  LOG of       YaCy: DATA/LOG/yacy00.log (and yacy<xx>.log)                **
**  STOP         YaCy: execute stopYACY.sh and wait some seconds             **
**  GET HELP for YaCy: see http://wiki.yacy.net and http://forum.yacy.de     **
 >> YaCy started as daemon process. Administration at http://localhost:8090 <<

This will start Yacy Start search

yacy Yacy Start

Searching in Yacy

yacy each Yacy Start




cyborg@cyborg:~$ sudo yacy-kill
killed pid  , YaCy terminated


cyborg@cyborg:~$ sudo yacy-stop
Please wait until the YaCy daemon process terminates [wget]
You can monitor this with 'tail -f DATA/LOG/yacy00.log' and 'fuser log/yacy00.log'


cyborg@cyborg:~$ sudo yacy-update


cyborg@cyborg:~$ sudo yacy-reconfigure 
[sudo] password for cyborg: 

*** YaCy commandline configuration tool ***

Make your choice:
[1] change memory settings
[2] change admin password
[3] change HTTP port
[4] change HTTPS port
[0] quit

Status: No actions have been performed yet.

yacy-reconfigure Yacy Start



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