Lunr.js vs Weaviate
A side-by-side comparison of two self-hosted search engines options — licensing, setup difficulty, resource needs, and what each one replaces.
Weaviate
Open-source vector database for semantic and AI search
| Feature | Lunr.js | Weaviate |
|---|---|---|
| Deploy effort | Read-the-docs project | Under-an-hour setup |
| Health score | 29 · At risk | 95 · Excellent |
| Category | Search Engines | Search Engines |
| License | MIT | BSD-3-Clause |
| Language | JavaScript | Go |
| Setup difficulty | Easy | Medium |
| Min. RAM | 64 MB | 2,048 MB |
| Deployment | source | docker, kubernetes, helm |
| GitHub stars | ★ 9,203 | ★ 16,841 |
| First released | 2013 | 2019 |
| Replaces | Algolia, Elasticsearch | Pinecone, Algolia |
What are Lunr.js and Weaviate?
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
Weaviate
Weaviate is an open-source vector database that stores objects and their vector embeddings for semantic search. It enables AI-powered similarity search, retrieval-augmented generation and hybrid queries.
- Vector and hybrid search
- Built-in vectorization modules
- GraphQL and REST APIs
- Horizontal scaling
Lunr.js vs Weaviate: key differences
Lunr.js is written in JavaScript, while Weaviate is built with Go. Licensing differs — MIT for Lunr.js versus BSD-3-Clause for Weaviate. Lunr.js is the lighter option, starting around 64 MB of RAM against 2,048 MB for Weaviate. Lunr.js is the more established project (first released 2013), while Weaviate arrived in 2019. Weaviate 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 Weaviate if…
- Great for AI semantic search
- Easy to start
Watch out for
- Memory hungry with large datasets
Frequently asked questions
Is Lunr.js or Weaviate better?
Neither is universally better. Weaviate has the larger community, while Lunr.js is simpler to set up (easy difficulty). Choose based on the comparison table above and your own setup.
Are Lunr.js and Weaviate free and open-source?
Yes. Lunr.js is licensed under MIT and Weaviate under BSD-3-Clause. Both can be self-hosted at no software cost.
Can I run Lunr.js and Weaviate with Docker?
Lunr.js: check the project docs for container support. Weaviate: yes.
Which is lighter on resources, Lunr.js or Weaviate?
Lunr.js has the smaller minimum footprint at 64 MB of RAM, compared to about 2,048 MB for Weaviate. Real-world usage depends on library size, user count, and enabled features.