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Best Offline-First Search Engines for self-hosting

The 18 best Offline-First search engines you can self-host, ranked by community traction.

Tantivy

Full-text search engine library written in Rust

Replaces Elasticsearch

★ 15.7k Hard setup MIT

Orama

Fast full-text and vector search engine for any runtime

Replaces Algolia, Elasticsearch

★ 10.5k Easy setup Apache-2.0

Lunr.js

Small full-text search library for the browser

Replaces Algolia, Elasticsearch

★ 9.2k Easy setup MIT

Pagefind

Static-site search that runs fully in the browser

Replaces Algolia, Elasticsearch

★ 5.4k Easy setup MIT

YaCy

Decentralized peer-to-peer web search engine

Replaces Google Search, Bing

★ 4k Medium setup GPL-2.0

Apache Lucene

Foundational open-source text search engine library

Replaces proprietary search SDKs

★ 3.5k Hard setup Apache-2.0

tinysearch

Tiny WebAssembly-powered static site search

Replaces Algolia

★ 3k Medium setup MIT

Stork

Fast, accessible static site search in WebAssembly

Replaces Algolia

★ 2.8k Easy setup Apache-2.0

Pyserini Search

Reproducible information retrieval toolkit

Replaces Elasticsearch

★ 2.1k Hard setup Apache-2.0

Marginalia Search

Independent search engine focused on the non-commercial web

Replaces Google Search

★ 1.9k Hard setup AGPL-3.0

Sist2

Lightning-fast tag-based file indexing and search engine

Replaces Recoll

★ 1.3k Medium setup GPL-3.0

PISA

Performant indexes and search for large text collections

Replaces Elasticsearch

★ 1.1k Hard setup Apache-2.0

Xapian

Mature open-source probabilistic search engine library

Replaces Elasticsearch

★ 877 Medium setup GPL-2.0

Whoosh

Pure-Python full-text indexing and search library

Replaces Elasticsearch

★ 358 Easy setup BSD-2-Clause

Recoll

Full-text desktop and server search for your documents

Replaces Google Desktop

★ 300 Medium setup GPL-2.0

Summa

Full-text search server able to run in the browser via WASM

Replaces Elasticsearch

★ 291 Medium setup MIT

DocFetcher

Cross-platform desktop search for document contents

Replaces Google Desktop

★ 63 Easy setup EPL-1.0

PeARS

Lightweight distributed web search you can host yourself

Replaces Google Search

★ 38 Medium setup AGPL-3.0

Every option here is open-source and self-hostable, tagged Offline-First within the search engines category. Compare them on the individual app pages for setup difficulty and resource requirements.