YaCy P2P Own Search Engine

Communication, Network & Web

Free
Download/Install required
No registration

YaCy is a decentralized, peer-to-peer (P2P) search engine framework that operates without a central server or governing authority. Each user installs a local node that crawls and indexes web pages, contributing to a distributed global index or maintaining a private, localized index. The service provides a fully open-source (GPL) alternative to centralized search engines, offering features such as intranet indexing, customizable search portals, and a transparent ranking algorithm.

By utilizing a P2P architecture, it ensures data privacy, eliminates user tracking, and provides a search environment resistant to external censorship or commercial ranking biases.

Nota: we do not list it in the “search” category nor in “resource”, as this is a server-app to install to make your own resource searchable. But it is simple to install, great to use, unique and free.

Disciplines: Privacy, Software engineering, IT administration, Information retrieval, Open source communities.

Free alternative to Google Search, Bing, DuckDuckGo.

YaCy P2P Own Search Engine compared with Google Search, Bing and DuckDuckGo
YaCy P2P Own Search Engine	Google Search	Bing	DuckDuckGo
Deployment and scope: Runs on the own computer, in a VM, in a Docker container or on Heroku, and needs Java 1.8 or later. It can join the public peer-to-peer network, serve a personal portal, or index an intranet with a scanner for HTTP, FTP and SMB servers.
Programmatic access: Built-in APIs over HTTP with XML and JSON output, so the index of the own node can be queried from other applications.	Programmatic access: The Custom Search JSON API is closed to new customers, and existing customers have until 1 January 2027 to move. Google points to Vertex AI Search for searching up to 50 domains.	Programmatic access: The Bing Search APIs were retired on 11 August 2025. Microsoft recommends Grounding with Bing Search in Azure AI Agents, which feeds web data to LLM agents.
Privacy: Search terms are hashed before they are sent to the peer network, and the software runs on hardware controlled by the user.			Privacy: The help page states that DuckDuckGo Search never tracks you, and that the connection is encrypted so an internet provider cannot see the searches.
Licence and cost: Open source under GPL 2.0 or later, with some parts under the LGPL, and no licence fee.	Licence and cost: The Custom Search JSON API offered a free daily quota of 100 queries, with further queries billed through a billing account.	Licence and cost: The former API is retired, so there is no current Bing Search API tariff to compare.

Topics covered: P2P, decentralized, search engine, framework, local node, crawls, indexes, distributed global index, open-source, GPL, intranet indexing, customizable search portals, ranking algorithm, data privacy, user tracking, censorship resistance, commercial ranking biases, server-app ISO/IEC 27001, ISO/IEC 27018, ISO/IEC 29100, ISO/IEC 20000, and ISO 9001..