Lunr.js vs Vespa
A side-by-side comparison of two self-hosted search engines options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Lunr.js | Vespa |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 29 · At risk | 91 · Excellent |
| Category | Search Engines | Search Engines |
| License | MIT | Apache-2.0 |
| Language | JavaScript | Java |
| Setup difficulty | Easy | Hard |
| Min. RAM | 64 MB | 4,096 MB |
| Deployment | source | docker, kubernetes, bare-metal |
| GitHub stars | ★ 9,203 | ★ 7,109 |
| First released | 2013 | 2017 |
| Replaces | Algolia, Elasticsearch | Elasticsearch, Algolia |
What are Lunr.js and Vespa?
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
Vespa
Vespa is an open-source platform for low-latency computation over large data sets, powering search, recommendation and AI applications. It combines storing, searching, ranking and organizing data.
- Combined search and ML ranking
- Vector and tensor computation
- Real-time indexing at scale
- Used for large recommendation systems
Lunr.js vs Vespa: key differences
Lunr.js is written in JavaScript, while Vespa is built with Java. Licensing differs — MIT for Lunr.js versus Apache-2.0 for Vespa. Lunr.js is the lighter option, starting around 64 MB of RAM against 4,096 MB for Vespa. Lunr.js is the more established project (first released 2013), while Vespa arrived in 2017. Vespa lists first-class Docker deployment; Lunr.js does not.
Why pick each one
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
Choose Vespa if…
- Extremely powerful and scalable
- Built-in ML ranking
Watch out for
- Steep learning curve
- Heavy resource needs
Frequently asked questions
Is Lunr.js or Vespa better?
Lunr.js is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider Vespa if its specific feature set fits your needs better.
Are Lunr.js and Vespa free and open-source?
Yes. Lunr.js is licensed under MIT and Vespa under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Lunr.js and Vespa with Docker?
Lunr.js: check the project docs for container support. Vespa: yes.
Which is lighter on resources, Lunr.js or Vespa?
Lunr.js has the smaller minimum footprint at 64 MB of RAM, compared to about 4,096 MB for Vespa. Real-world usage depends on library size, user count, and enabled features.