Apache LuceneTM is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.
Apache Lucene is an open source project available for free download. Please use the links on the right to access Lucene.
LuceneTM Features
Lucene offers powerful features through a simple API:
Scalable, High-Performance Indexing
over 150GB/hour on modern hardware
small RAM requirements -- only 1MB heap
incremental indexing as fast as batch indexing
index size roughly 20-30% the size of text indexed
Powerful, Accurate and Efficient Search Algorithms
ranked searching -- best results returned first
many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more
fielded searching (e.g. title, author, contents)
sorting by any field
multiple-index searching with merged results
allows simultaneous update and searching
flexible faceting, highlighting, joins and result grouping
fast, memory-efficient and typo-tolerant suggesters
pluggable ranking models, including the Vector Space Model and Okapi BM25
configurable storage engine (codecs)
Cross-Platform Solution
Available as Open Source software under the Apache License which lets you use Lucene in both commercial and Open Source programs
100%-pure Java
Implementations in other programming languages available that are index-compatible
Lucene implementations in languages other than Java:
LuceneTM Tutorials
Apache Lucene is an open source project available for free download. Please use the links on the right to access Lucene.
LuceneTM Downloads
LuceneTM Features
Lucene offers powerful features through a simple API:
Scalable, High-Performance Indexing
over 150GB/hour on modern hardware
small RAM requirements -- only 1MB heap
incremental indexing as fast as batch indexing
index size roughly 20-30% the size of text indexed
Powerful, Accurate and Efficient Search Algorithms
ranked searching -- best results returned first
many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more
fielded searching (e.g. title, author, contents)
sorting by any field
multiple-index searching with merged results
allows simultaneous update and searching
flexible faceting, highlighting, joins and result grouping
fast, memory-efficient and typo-tolerant suggesters
pluggable ranking models, including the Vector Space Model and Okapi BM25
configurable storage engine (codecs)
Cross-Platform Solution
Available as Open Source software under the Apache License which lets you use Lucene in both commercial and Open Source programs
100%-pure Java
Implementations in other programming languages available that are index-compatible
Lucene implementations in languages other than Java:
- CLucene - Lucene implementation in C++
- Lucene.Net - Lucene implementation in .NET
- Lucene4c - Lucene implementation in C
- LuceneKit - Lucene implementation in Objective-C (Cocoa/GNUstep support)
- Lupy - Lucene implementation in Python (RETIRED)
- NLucene - another Lucene implementation in .NET (out of date)
- Zend Search - Lucene implementation in the Zend Framework for PHP 5
- Plucene - Lucene implementation in Perl
- KinoSearch - a new Lucene implementation in Perl
- PyLucene - GCJ-compiled version of Java Lucene integrated with Python
- MUTIS - Lucene implementation in Delphi
- Ferret - Lucene implementation in Ruby
- Montezuma - Lucene implementation in Common Lisp
LuceneTM Tutorials
