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PISA

Performant indexes and search for large text collections

Search Engines ★ 1.1k stars Hard setup Apache-2.0

PISA is an open-source search engine library and toolkit focused on efficient indexing and query processing of large document collections. It is widely used for information retrieval research and high-performance text search.

Official siteSource code

Key features

  • High-performance indexing
  • Efficient query processing
  • Research-grade retrieval
  • Large collection support

Strengths

  • Released under the Apache-2.0 license
  • Active community (1.1k GitHub stars)
  • Written in C++

Is PISA secure?

OSV.dev has no published security advisories for PISA's repository. No known vulnerabilities is not proof of security: it means none have been publicly catalogued.

Source: OSV.dev, checked 2026-10-14. How this is measured.

PISA replaces

Self-hosted Elasticsearch alternatives

Health badge

Maintain PISA? Add its health score to your README. The badge links back to this page.

SelfHostIndex: 65 · good

Markdown
[![SelfHostIndex health score for PISA](https://selfhostindex.com/badge/pisa-search.svg)](https://selfhostindex.com/app/pisa-search/)
HTML
<a href="https://selfhostindex.com/app/pisa-search/"><img src="https://selfhostindex.com/badge/pisa-search.svg" alt="SelfHostIndex health score for PISA"></a>
reStructuredText
.. image:: https://selfhostindex.com/badge/pisa-search.svg
   :alt: SelfHostIndex health score for PISA
   :target: https://selfhostindex.com/app/pisa-search/

The score is recomputed on every nightly rebuild from public repository data — see how it is calculated.

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