Sonic

What Sonic is

Sonic is a free, open-source search backend for applications that need to find records by their text. It indexes search text alongside identifiers, then returns matching identifiers for an application to look up in an external database; it does not keep the underlying textual data in its index. Search features include natural-language query normalization, typo correction when exact matches are lacking, and real-time word completion. Its language lexer supports over 80 languages, removing stop words after language detection; unsupported languages can be indexed without that filtering. Terms are organized in collections and buckets, including buckets for user-specific indexes. Sonic runs self-hosted on Linux and uses Sonic Channel, a TCP-based protocol for search, ingestion, and object management. It has no HTTP endpoint. Official client libraries are listed for Node.js, Rust, and PHP, alongside community libraries for other languages. Installation methods include releases, Cargo, source, Docker, and Debian-based packages; official packages target 64-bit Debian 12. The project is licensed under MPL-2.0.

Who it suits

Sonic may suit developers building self-hosted search into applications that can resolve returned identifiers in an external database. Its listed language libraries include options for several common development ecosystems.

Limits

Each bucket uses a 32-bit internal identifier, theoretically allowing about 4.2 billion indexed objects. For each word, Sonic retains only the N most recently pushed results; the sliding-window width is configurable.

Getting started

1. Open the project at https://github.com/valeriansaliou/sonic.
2. Choose a documented installation route: releases, Cargo, source, Docker, or a Debian-based package.
3. Run Sonic on a supported Linux setup; official packages target 64-bit Debian 12.
4. Connect through Sonic Channel, its TCP-based protocol, using an available client library.
5. Organize search terms into collections and buckets, then have your application resolve matching identifiers in its external database.

Verdict

Sonic provides a focused search backend with language-aware query features and multiple integration options. Its self-hosted deployment and TCP-based protocol are important considerations for teams planning how to connect it to an application.