Apache Solr vs Lunr.js
A side-by-side comparison of two self-hosted search engines options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Apache Solr | Lunr.js |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 81 · Excellent | 29 · At risk |
| Category | Search Engines | Search Engines |
| License | Apache-2.0 | MIT |
| Language | Java | JavaScript |
| Setup difficulty | Hard | Easy |
| Min. RAM | 1,024 MB | 64 MB |
| Deployment | docker, kubernetes, bare-metal | source |
| GitHub stars | ★ 1,674 | ★ 9,203 |
| First released | 2006 | 2013 |
| Replaces | Elasticsearch, Algolia | Algolia, Elasticsearch |
What are Apache Solr and Lunr.js?
Apache Solr
Apache Solr is a highly reliable, scalable and fault-tolerant open-source search platform built on Apache Lucene. It powers full-text search, faceting and analytics for many large websites and applications.
- Lucene-powered full-text search
- Faceting and rich querying
- Distributed SolrCloud mode
- Extensive plugin ecosystem
Lunr.js
Lunr.js is a small, full-text search library for use in the browser that provides a simple search index without needing a backend service. It is commonly used to add offline search to static sites and documentation.
- Browser-based search
- No backend needed
- Prebuilt index support
- Tiny library size
Apache Solr vs Lunr.js: key differences
Apache Solr is written in Java, while Lunr.js is built with JavaScript. Licensing differs — Apache-2.0 for Apache Solr versus MIT for Lunr.js. Lunr.js is the lighter option, starting around 64 MB of RAM against 1,024 MB for Apache Solr. Apache Solr is the more established project (first released 2006), while Lunr.js arrived in 2013. Lunr.js has the considerably larger community, at 9,203 GitHub stars versus 1,674. Apache Solr lists first-class Docker deployment; Lunr.js does not.
Why pick each one
Choose Apache Solr if…
- Mature and battle-tested
- Powerful faceting
Watch out for
- Configuration is complex
Choose Lunr.js if…
- Released under the MIT license
- Easy to set up — beginner-friendly
- Mature project with 9.2k GitHub stars
- Written in JavaScript
Frequently asked questions
Is Apache Solr or Lunr.js better?
Lunr.js is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Apache Solr if its specific feature set fits your needs better.
Are Apache Solr and Lunr.js free and open-source?
Yes. Apache Solr is licensed under Apache-2.0 and Lunr.js under MIT. Both can be self-hosted at no software cost.
Can I run Apache Solr and Lunr.js with Docker?
Apache Solr: yes. Lunr.js: check the project docs for container support.
Which is lighter on resources, Apache Solr or Lunr.js?
Lunr.js has the smaller minimum footprint at 64 MB of RAM, compared to about 1,024 MB for Apache Solr. Real-world usage depends on library size, user count, and enabled features.