# Hybrid search

> Lexical ranking such as BM25 combined with vector similarity in one result. The useful question is when each signal should win, and how to check that the blend did not quietly get worse.

Broader subject: [Relevance](https://oppority.com/topics/relevance.md).

## Work

- [Concept search before vectors were the default](https://oppority.com/work/concept-search.md): A books-and-journals search that let people explore by concepts, built in 2018 from phrases and similarity, not from a vector database.
- [A new engine, tried on a laptop](https://oppority.com/work/reading-luxir.md): A hands-on reading of Luxir, a new hybrid search engine, run from a Mac or Windows laptop without compiling C++.

## Notes

- [Run Luxir on a Mac or Windows laptop (no Linux, no C++)](https://oppority.com/writing/run-luxir-on-a-mac-or-windows-laptop.md)