Installation

Requirements

Tool or platform	Minimum
iOS	16.0
macOS	14.0
Swift	5.9
Xcode	15

Xcode

Choose File → Add Package Dependencies, then enter:

https://github.com/KittenML/KittenTTS-swift

Add the KittenTTS library product to the app target.

Package.swift

dependencies: [
    .package(
        url: "https://github.com/KittenML/KittenTTS-swift",
        from: "0.1.0"
    ),
],
targets: [
    .target(
        name: "YourApp",
        dependencies: [
            .product(name: "KittenTTS", package: "KittenTTS-swift")
        ]
    ),
]

The package brings ONNX Runtime through Microsoft's Swift Package Manager package and compiles the CE phonemizer bridge as C++17.

First initialization

let tts = try await KittenTTS { progress in
    print("Download: \(Int(progress * 100))%")
}

Initialization downloads phonemizer dictionaries, the ONNX model, and voices.npz if they are not cached. It then creates the inference engine off the calling actor.

Use KittenTTS.isModelCached() to choose whether the UI should present a download step.