Dev tools · alternatives · 2026

24 alternatives to Pisa – Full Text Search Engine Written in C++

PISA: Performant Indexes and Search for Academia. Contribute to pisa-engine/pisa development by creating an account on GitHub.

Pisa is a full-text search engine implemented in C++, designed for developers who need fast text indexing and retrieval capabilities. It provides core search functionality built from scratch in a performant language… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Pisa – Full Text Search Engine Written in C++ launched in 2020; newer entries below may have overtaken it.

1. 1
   Pisa – Probably the Fastest Full Text Search Engine Written in C++▲17

   PISA: Performant Indexes and Search for Academia. Contribute to pisa-engine/pisa development by creating an account on GitHub.

   2019 · github.com · its alternatives →

2. 2
   PISA – A text search engine able to run on large-scale collections▲48

   PISA: Performant Indexes and Search for Academia. Contribute to pisa-engine/pisa development by creating an account on GitHub.

   2019 · github.com · its alternatives →

3. 3
   Pisa – Probably the Fastest Full Text Search Engine Written in C++▲13

   PISA: Performant Indexes and Search for Academia. Contribute to pisa-engine/pisa development by creating an account on GitHub.

   2019 · github.com · its alternatives →

4. 4
   Pisa – Performant Indexes and Search for Academia▲17

   PISA: Performant Indexes and Search for Academia. Contribute to pisa-engine/pisa development by creating an account on GitHub.

   2019 · github.com · its alternatives →

5. 5
   Slab▲747

   Modern knowledge base & wiki for teams

   2018 · slab.com · its alternatives →

6. 6
   Tantivy▲68

   A full-text, horse-speed search engine library in Rust

   2022 · github.com · its alternatives →

7. 7FT
   Full text search Project Gutenberg (60m paragraphs)▲202

   2021 · gutensearch.com · its alternatives →

8. 8
   I wrote a full text search engine in Go▲131

   Full Text Search Engine - built for Hackers not Hyperscalers - 0xnyn/blaze

   2025 · github.com · its alternatives →

9. 9
   Meilisearch AI▲241

   Boost relevance and UX with fast hybrid and semantic search

   2025 · meilisearch.com · its alternatives →

10. 10
    Compile-time HTML parsing in C++14▲175

    A C++ HTML template engine that uses compile time HTML parsing - rep-movsd/see-phit

    2017 · github.com · its alternatives →

11. 11
    SearchGPT Prototype▲560

    A prototype of new search features from OpenAI

    2024 · chatgpt.com · its alternatives →

12. 12
    I built a small browser engine from scratch in C++▲146

    Hi HN! Korean high school senior here, about to start CS in college. I built a browser engine from scratch in C++ to understand how browsers work. First time using C++, 8 weeks of development, lots of debugging—but it works! Features: - HTML parsing with error correction - CSS cascade and inheritance - Block/inline layout engine - Async image loading + caching - Link navigation + history Hardest parts: - String parsing(html, css) - Rendering - Image Caching & Layout Reflowing What I learned (beyond code): - Systematic debugging is crucial - Ship with known bugs rather than chase…

    Jan 2026 · github.com · its alternatives →

13. 13
    SeekStorm – open-source sub-millisecond search in Rust▲245

    SeekStorm: vector & lexical search - in-process library & multi-tenancy server, in Rust. - SeekStorm/SeekStorm

    2024 · github.com · its alternatives →

14. 14AS
    A search engine that lets you 'add' words as vectors▲148

    2013 · insightdatascience.com · its alternatives →

15. 15
    Postgres extension for BM25 relevance-ranked full-text search▲203

    Last summer we faced a conundrum at my company, Tiger Data, a Postgres cloud vendor whose main business is in timeseries data. We were trying to grow our business towards emerging AI-centric workloads and wanted to provide a state-of-the-art hybrid search stack in Postgres. We'd already built pgvectorscale in house with the goal of scaling semantic search beyond pgvector's main memory limitations. We just needed a scalable ranked keyword search solution too. The problem: core Postgres doesn't provide this; the leading Postgres BM25 extension, ParadeDB, is guarded behind AGPL; developing our…

    Mar 2026 · github.com · its alternatives →

16. 16
    Crown – A flexible game engine written from scratch in C++▲193

    Crown Engine. Contribute to dbartolini/crown development by creating an account on GitHub.

    2017 · github.com · its alternatives →

17. 17
    Coros – A Modern C++ Library for Task Parallelism▲129

    Hello Hacker News. I’m Martin, a graduate student from Prague, and I’ve been working on Coros, a C++ library for task-based parallelism. After spending some time with OpenMP and oneTBB, I wanted to try building a library using modern features from the C++ standard library. I’ve used coroutines for task encapsulation and C++23 expected for exception handling, while trying to maintain good performance. Additionally, I’ve implemented monadic-like behavior to allow easy chaining of tasks, similar to the monadic operations in std::expected. You can check out the project here:…

    2024 · github.com · its alternatives →

18. 18BI
    Binarysearch.io – Learn Algorithms Together▲279

    2020 · binarysearch.io · its alternatives →

19. 19
    HelixDB – Open-source vector-graph database for AI applications (Rust)▲237

    Hey HN, we want to share HelixDB (https://github.com/HelixDB/helix-db/), a project a college friend and I are working on. It’s a new database that natively intertwines graph and vector types, without sacrificing performance. It’s written in Rust and our initial focus is on supporting RAG. Here’s a video runthrough: https://screen.studio/share/szgQu3yq. Why a hybrid? Vector databases are useful for similarity queries, while graph databases are useful for relationship queries. Each stores data in a way that’s best for its main type of query (e.g.…

    2025 · github.com · its alternatives →

20. 20
    ColBERT Build from Sentence Transformers▲66

    Neural Search. Contribute to raphaelsty/neural-cherche development by creating an account on GitHub.

    2023 · github.com · its alternatives →

21. 21MI
    Moocha.io – A search engine for MOOCs▲231

    2017 · moocha.io · its alternatives →

22. 22
    Chonkie – A Fast, Lightweight Text Chunking Library for RAG▲199

    I built Chonkie because I was tired of rewriting chunking code for RAG applications. Existing libraries were either too bloated (80MB+) or too basic, with no middle ground. Core features: - 21MB default install vs 80-171MB alternatives - 33x faster token chunking than popular alternatives - Supports multiple chunking strategies: token, word, sentence, and semantic - Works with all major tokenizers (transformers, tokenizers, tiktoken) - Zero external dependencies for basic functionality Technical optimizations: - Uses tiktoken with multi-threading for faster tokenization - Implements…

    2024 · github.com · its alternatives →

23. 23
    IResearch – C++ search that beat Lucene and Tantivy on their benchmark▲15

    The First Real-Time Search Analytics Database. Contribute to serenedb/serenedb development by creating an account on GitHub.

    May 2026 · github.com · its alternatives →

24. 24
    RaftLib – Easy, productive parallel programming in C++▲62

    Simple, easy to use stream computation library for C++.

    2016 · raftlib.io · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →