Blast vs Pyserini
A side-by-side comparison of two self-hosted search engines options — licensing, setup difficulty, resource needs, and what each one replaces.
| Feature | Blast | Pyserini |
|---|---|---|
| Deploy effort | Under-an-hour setup | Read-the-docs project |
| Health score | 14 · At risk | 86 · Excellent |
| Status | Archived | Actively maintained |
| Category | Search Engines | Search Engines |
| License | Apache-2.0 | Apache-2.0 |
| Language | Go | Python |
| Setup difficulty | Hard | Hard |
| Min. RAM | 512 MB | 2,048 MB |
| Deployment | docker, binary, source | source |
| GitHub stars | ★ 1,073 | ★ 2,166 |
| First released | 2017 | 2019 |
| Replaces | Elasticsearch | Elasticsearch |
What are Blast and Pyserini?
Blast
Blast is a full-text search and indexing server written in Go and built on the Bleve library, with support for clustering through the Raft consensus algorithm. It exposes both gRPC and HTTP APIs for indexing and searching documents.
- Distributed clustering
- Bleve-based indexing
- gRPC and HTTP APIs
- Raft consensus
Pyserini
Pyserini is an open-source toolkit for reproducible information retrieval research, providing sparse and dense search over text collections. Self-hosters use it to build and query custom search indexes.
- Sparse and dense retrieval
- Reproducible pipelines
- Custom index building
- Research grade tools
Blast vs Pyserini: key differences
The biggest difference is maintenance: Blast's repository is archived and no longer developed, while Pyserini is actively maintained. Blast is written in Go, while Pyserini is built with Python. Blast is the lighter option, starting around 512 MB of RAM against 2,048 MB for Pyserini. Blast is the more established project (first released 2017), while Pyserini arrived in 2019. Pyserini has the considerably larger community, at 2,166 GitHub stars versus 1,073. Blast lists first-class Docker deployment; Pyserini does not.
Why pick each one
Choose Blast if…
- Released under the Apache-2.0 license
- First-class Docker support for quick deployment
- Active community (1.1k GitHub stars)
- Written in Go
Choose Pyserini if…
- Strong retrieval features
- Good for experimentation
Watch out for
- Research oriented
- Not a turnkey server
Frequently asked questions
Is Blast or Pyserini better?
Neither is universally better. Pyserini has the larger community; both share a hard setup difficulty, so the decision comes down to features and licensing.
Are Blast and Pyserini free and open-source?
Yes. Blast is licensed under Apache-2.0 and Pyserini under Apache-2.0. Both can be self-hosted at no software cost.
Can I run Blast and Pyserini with Docker?
Blast: yes. Pyserini: check the project docs for container support.
Which is lighter on resources, Blast or Pyserini?
Blast has the smaller minimum footprint at 512 MB of RAM, compared to about 2,048 MB for Pyserini. Real-world usage depends on library size, user count, and enabled features.