# PISA

> PISA is an inverted index library for semantic search, supporting sparse and dense vectors with advanced compression techniques. It offers multi-threaded querying and learned indexes, primarily oriented towards research applications in information retrieval.

- **URL:** https://github.com/pisa-engine/pisa
- **Category:** Vector Indexing Libraries
- **Tags:** inverted-index, learned-compression, research-lib
- **Updated:** 2026-04-23 13:22
- **Canonical page:** https://vectordb.ever.works/items/pisa

## Details

## Overview

PISA is a research-oriented inverted index library designed for efficient semantic search using sparse and dense vectors.

## Features

- Support for sparse/dense vectors
- Advanced compression techniques
- Multi-threaded query processing
- Learned indexes

## Pricing

Open-source under Apache 2.0 license.

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