Show HN: Fixing grammar and spelling using on-device Apple Foundation Model

A developer released an open-source tool that uses Apple's on-device Foundation Model to fix grammar and spelling on Apple Silicon Macs. The tool, built with Swift and exposed via a C function, runs locally without sending data to the cloud. It demonstrates practical use of Apple's on-device language model for writing tasks.

Grammar and spelling-fixing tool using Apple's Foundation Model, run locally on any Apple Silicon Macs. Build the binary with: bash $ make You will need to have Xcode installed to compile the Swift LLM bridge. The output of the build process is a grammar-fix binary that you can run. Run the command and pass the input string: $ /grammar-fix "he eat two apple" output: He ate two apples. For a while now, Apple devices shipped with an on-device language model https://developer.apple.com/documentation/foundationmodels/systemlanguagemodel . The model can be used for some writing tasks, but it's only accessible for Swift via the Foundation Models framework. This project bridged https://github.com/huytd/afm-grammar/blob/main/LLMBridge.swift the API and expose it as a C function https://github.com/huytd/afm-grammar/blob/main/LLMBridge.h , so we can use it for simple tasks like fixing grammar.