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arXiv · 2608.05543

omni-macos: On-Device Omni-Modal Search on Apple Silicon

Han Xiao
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Abstract

A search engine that embeds text, code, documents, images, audio and video into the same representation space has to run its encoder and keep its index somewhere, and almost every component built for the purpose assumes a server. We present omni-macos, which runs its encoder, index and store on the Mac that already holds the files, so no indexed file, no typed query and no vector ever leaves the machine. It keeps a background indexer and an interactive search box inside one memory budget the user sets: it re-encodes only the chunks an edit changes, hands the GPU smaller units while the user is typing, answers queries from a one-bit replica of the index with exact rescoring, and propagates that budget to the allocators that draw on unified memory. We measure on five Macs spanning an eightfold range of accelerator width and a thirty-twofold range of memory, each indexing the files it already holds.

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Han Xiao. 2026-08-06. omni-macos: On-Device Omni-Modal Search on Apple Silicon. https://arxiv.org/abs/2608.05543

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