RediSearch 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 | RediSearch | Vespa |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 90 · Excellent | 91 · Excellent |
| Category | Search Engines | Search Engines |
| License | RSALv2 | Apache-2.0 |
| Language | Rust | Java |
| Setup difficulty | Medium | Hard |
| Min. RAM | 512 MB | 4,096 MB |
| Deployment | docker, kubernetes, binary | docker, kubernetes, bare-metal |
| GitHub stars | ★ 6,242 | ★ 7,109 |
| First released | 2017 | 2017 |
| Replaces | Elasticsearch, Algolia | Elasticsearch, Algolia |
What are RediSearch and Vespa?
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
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
RediSearch vs Vespa: key differences
RediSearch is written in Rust, while Vespa is built with Java. Licensing differs — RSALv2 for RediSearch versus Apache-2.0 for Vespa. RediSearch is the lighter option, starting around 512 MB of RAM against 4,096 MB for Vespa.
Why pick each one
Choose RediSearch if…
- Very fast, in-memory
- Reuses existing Redis
Watch out for
- Source-available, not OSI licensed
Choose Vespa if…
- Extremely powerful and scalable
- Built-in ML ranking
Watch out for
- Steep learning curve
- Heavy resource needs
Frequently asked questions
Is RediSearch or Vespa better?
Neither is universally better. Vespa has the larger community, while RediSearch is simpler to set up (medium difficulty). Choose based on the comparison table above and your own setup.
Are RediSearch and Vespa free and open-source?
Yes. RediSearch is licensed under RSALv2 and Vespa under Apache-2.0. Both can be self-hosted at no software cost.
Can I run RediSearch and Vespa with Docker?
RediSearch: yes. Vespa: yes.
Which is lighter on resources, RediSearch or Vespa?
RediSearch has the smaller minimum footprint at 512 MB of RAM, compared to about 4,096 MB for Vespa. Real-world usage depends on library size, user count, and enabled features.