On-device Inference of Whisper Speech Recognition Models for Apple Silicon

What's New



Early stopping now keeps track of the chunked window internally when running async transcription via the VAD chunking method. This will give further control for stopping specific windows based on your custom criteria in the TranscriptionCallback.

What's Changed

Full Changelog: v0.7.1...v0.7.2

WhisperKit WhisperKit


Tests License Supported Swift Version Supported Platforms Discord

WhisperKit is a Swift package that integrates OpenAI's popular Whisper speech recognition model with Apple's CoreML framework for efficient, local inference on Apple devices.

Check out the demo app on TestFlight.

[Blog Post] [Python Tools Repo]

Table of Contents


Swift Package Manager

WhisperKit can be integrated into your Swift project using the Swift Package Manager.


  • macOS 14.0 or later.
  • Xcode 15.0 or later.


  1. Open your Swift project in Xcode.
  2. Navigate to File > Add Package Dependencies....
  3. Enter the package repository URL: https://github.com/argmaxinc/whisperkit.
  4. Choose the version range or specific version.
  5. Click Finish to add WhisperKit to your project.


You can install WhisperKit command line app using Homebrew by running the following command:

brew install whisperkit-cli

Getting Started

To get started with WhisperKit, you need to initialize it in your project.

Quick Example

This example demonstrates how to transcribe a local audio file:

import WhisperKit

// Initialize WhisperKit with default settings
Task {
   let pipe = try? await WhisperKit()
   let transcription = try? await pipe!.transcribe(audioPath: "path/to/your/audio.{wav,mp3,m4a,flac}")?.text

Model Selection

WhisperKit automatically downloads the recommended model for the device if not specified. You can also select a specific model by passing in the model name:

let pipe = try? await WhisperKit(model: "large-v3")

This method also supports glob search, so you can use wildcards to select a model:

let pipe = try? await WhisperKit(model: "distil*large-v3")

Note that the model search must return a single model from the source repo, otherwise an error will be thrown.

For a list of available models, see our HuggingFace repo.

Generating Models

WhisperKit also comes with the supporting repo whisperkittools which lets you create and deploy your own fine tuned versions of Whisper in CoreML format to HuggingFace. Once generated, they can be loaded by simply changing the repo name to the one used to upload the model:

let pipe = try? await WhisperKit(model: "large-v3", modelRepo: "username/your-model-repo")

Swift CLI

The Swift CLI allows for quick testing and debugging outside of an Xcode project. To install it, run the following:

git clone https://github.com/argmaxinc/whisperkit.git
cd whisperkit

Then, setup the environment and download your desired model.

make setup
make download-model MODEL=large-v3


  1. This will download only the model specified by MODEL (see what's available in our HuggingFace repo, where we use the prefix openai_whisper-{MODEL})
  2. Before running download-model, make sure git-lfs is installed

If you would like download all available models to your local folder, use this command instead:

make download-models

You can then run them via the CLI with:

swift run whisperkit-cli transcribe --model-path "Models/whisperkit-coreml/openai_whisper-large-v3" --audio-path "path/to/your/audio.{wav,mp3,m4a,flac}" 

Which should print a transcription of the audio file. If you would like to stream the audio directly from a microphone, use:

swift run whisperkit-cli transcribe --model-path "Models/whisperkit-coreml/openai_whisper-large-v3" --stream

Contributing & Roadmap

Our goal is to make WhisperKit better and better over time and we'd love your help! Just search the code for "TODO" for a variety of features that are yet to be built. Please refer to our contribution guidelines for submitting issues, pull requests, and coding standards, where we also have a public roadmap of features we are looking forward to building in the future.


WhisperKit is released under the MIT License. See LICENSE for more details.


If you use WhisperKit for something cool or just find it useful, please drop us a note at info@takeargmax.com!

If you use WhisperKit for academic work, here is the BibTeX:

   title = {WhisperKit},
   author = {Argmax, Inc.},
   year = {2024},
   URL = {https://github.com/argmaxinc/WhisperKit}


  • Swift Tools 5.9.0
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Last updated: Sat Jun 15 2024 11:11:25 GMT-0900 (Hawaii-Aleutian Daylight Time)