Lunr.js vs RediSearch
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 | RediSearch |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 29 · At risk | 90 · Excellent |
| Category | Search Engines | Search Engines |
| License | MIT | RSALv2 |
| Language | JavaScript | Rust |
| Setup difficulty | Easy | Medium |
| Min. RAM | 64 MB | 512 MB |
| Deployment | source | docker, kubernetes, binary |
| GitHub stars | ★ 9,203 | ★ 6,242 |
| First released | 2013 | 2017 |
| Replaces | Algolia, Elasticsearch | Elasticsearch, Algolia |
What are Lunr.js and RediSearch?
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
RediSearch
RediSearch, part of the Redis Query Engine, adds full-text search, secondary indexing and vector search capabilities to Redis. It enables fast querying over data already stored in Redis.
- Full-text search inside Redis
- Secondary indexing of Redis data
- Vector similarity search
- Aggregations and queries
Lunr.js vs RediSearch: key differences
Lunr.js is written in JavaScript, while RediSearch is built with Rust. Licensing differs — MIT for Lunr.js versus RSALv2 for RediSearch. Lunr.js is the lighter option, starting around 64 MB of RAM against 512 MB for RediSearch. Lunr.js is the more established project (first released 2013), while RediSearch arrived in 2017. RediSearch 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 RediSearch if…
- Very fast, in-memory
- Reuses existing Redis
Watch out for
- Source-available, not OSI licensed
Frequently asked questions
Is Lunr.js or RediSearch better?
Lunr.js is the stronger all-round pick: it has both the larger community and the simpler easy setup. Consider RediSearch if its specific feature set fits your needs better.
Are Lunr.js and RediSearch free and open-source?
Yes. Lunr.js is licensed under MIT and RediSearch under RSALv2. Both can be self-hosted at no software cost.
Can I run Lunr.js and RediSearch with Docker?
Lunr.js: check the project docs for container support. RediSearch: yes.
Which is lighter on resources, Lunr.js or RediSearch?
Lunr.js has the smaller minimum footprint at 64 MB of RAM, compared to about 512 MB for RediSearch. Real-world usage depends on library size, user count, and enabled features.