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This would be even great if available as a Spotlight Search replacement (with some additional features that Spotlight supports).

Should be easy to plug it in with a Raycast.app or Alfred.app plugin.

Khoj exposes a local API. Hopefully that makes it easy to integrate with Raycast, Alfred (or even Spotlight)?

Yeah, this would be ideal for Mac users. Just need to look into what is required and how much work it is