Apache Solr 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 | Apache Solr | RediSearch |
|---|---|---|
| Deploy effort | Under-an-hour setup | Under-an-hour setup |
| Health score | 81 · Excellent | 90 · Excellent |
| Category | Search Engines | Search Engines |
| License | Apache-2.0 | RSALv2 |
| Language | Java | Rust |
| Setup difficulty | Hard | Medium |
| Min. RAM | 1,024 MB | 512 MB |
| Deployment | docker, kubernetes, bare-metal | docker, kubernetes, binary |
| GitHub stars | ★ 1,674 | ★ 6,242 |
| First released | 2006 | 2017 |
| Replaces | Elasticsearch, Algolia | Elasticsearch, Algolia |
What are Apache Solr and RediSearch?
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
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
Apache Solr vs RediSearch: key differences
Apache Solr is written in Java, while RediSearch is built with Rust. Licensing differs — Apache-2.0 for Apache Solr versus RSALv2 for RediSearch. RediSearch is the lighter option, starting around 512 MB of RAM against 1,024 MB for Apache Solr. Apache Solr is the more established project (first released 2006), while RediSearch arrived in 2017. RediSearch has the considerably larger community, at 6,242 GitHub stars versus 1,674.
Why pick each one
Choose Apache Solr if…
- Mature and battle-tested
- Powerful faceting
Watch out for
- Configuration is complex
Choose RediSearch if…
- Very fast, in-memory
- Reuses existing Redis
Watch out for
- Source-available, not OSI licensed
Frequently asked questions
Is Apache Solr or RediSearch better?
RediSearch is the stronger all-round pick: it has both the larger community and the simpler medium setup. Consider Apache Solr if its specific feature set fits your needs better.
Are Apache Solr and RediSearch free and open-source?
Yes. Apache Solr is licensed under Apache-2.0 and RediSearch under RSALv2. Both can be self-hosted at no software cost.
Can I run Apache Solr and RediSearch with Docker?
Apache Solr: yes. RediSearch: yes.
Which is lighter on resources, Apache Solr or RediSearch?
RediSearch has the smaller minimum footprint at 512 MB of RAM, compared to about 1,024 MB for Apache Solr. Real-world usage depends on library size, user count, and enabled features.