RunAnywhere Swift SDK

A production-grade, on-device AI SDK for iOS, macOS, tvOS, and watchOS. The SDK enables low-latency, privacy-preserving inference for large language models, speech recognition, and voice synthesis with modular backend support.

Overview
Features
Requirements
Installation
Quick Start
Configuration
Usage Examples
Architecture
Logging and Observability
Error Handling
Performance Guidelines
FAQ
Contributing
License

Overview

The RunAnywhere Swift SDK enables developers to run AI models directly on Apple devices without requiring network connectivity for inference. By keeping data on-device, the SDK ensures minimal latency and maximum privacy for your users.

The SDK provides a unified interface to multiple AI capabilities, including large language models (LLMs), speech-to-text (STT), text-to-speech (TTS), voice activity detection (VAD), and speaker diarization. These capabilities are delivered through pluggable backend modules that can be included as needed.

Key Capabilities

Multi-backend architecture - Choose from LlamaCPP (GGUF models), ONNX Runtime, or Apple Foundation Models
Metal acceleration - GPU-accelerated inference on Apple Silicon
Event-driven design - Subscribe to SDK events for reactive UI updates
Production-ready - Built-in analytics, logging, device registration, and model lifecycle management

Features

Language Models (LLM)

On-device text generation with streaming support
Structured output generation with Generatable protocol
System prompts and customizable generation parameters
Support for thinking/reasoning models with token extraction
Multiple framework backends (LlamaCPP, Apple Foundation Models)

Speech-to-Text (STT)

Real-time streaming transcription
Batch audio transcription
Multi-language support
Whisper-based models via ONNX Runtime

Text-to-Speech (TTS)

Neural voice synthesis with ONNX models
System voices via AVSpeechSynthesizer
Streaming audio generation for long text
Customizable voice, pitch, rate, and volume

Voice Activity Detection (VAD)

Energy-based speech detection
Configurable sensitivity thresholds
Real-time audio stream processing

Speaker Diarization

Identify multiple speakers in audio
Speaker segmentation and labeling
Integration with FluidAudio

Voice Agent Pipeline

Full VAD to STT to LLM to TTS orchestration
Complete voice conversation flow
Streaming and batch processing modes

Model Management

Automatic model discovery and catalog sync
Download with progress tracking (download, extract, validate stages)
In-memory model storage with file system caching
Framework-specific model assignment

Observability

Comprehensive event system via EventBus
Analytics and telemetry integration
Structured logging with Pulse support
Performance metrics (tokens per second, latency, memory)

Requirements

Platform	Minimum Version
iOS	17.0+
macOS	14.0+
tvOS	17.0+
watchOS	10.0+

Swift Version: 5.9+

Xcode: 15.2+

Some optional modules have higher runtime requirements:

Apple Foundation Models (RunAnywhereAppleAI): iOS 26+ / macOS 26+ at runtime

Installation

Swift Package Manager (Recommended)

Add the RunAnywhere SDK to your project using Xcode:

Open your project in Xcode
Go to File > Add Package Dependencies...

Enter the repository URL:

https://github.com/RunanywhereAI/runanywhere-sdks

Select the version (e.g., from: "1.0.0")
Choose the products you need:
- RunAnywhere (required) - Core SDK
- RunAnywhereONNX - ONNX Runtime for STT/TTS/VAD
- RunAnywhereLlamaCPP - LLM text generation with GGUF models

Package.swift

swift

dependencies: [
    .package(url: "https://github.com/RunanywhereAI/runanywhere-sdks", from: "1.0.0")
],
targets: [
    .target(
        name: "YourApp",
        dependencies: [
            .product(name: "RunAnywhere", package: "runanywhere-sdks"),
            .product(name: "RunAnywhereLlamaCPP", package: "runanywhere-sdks"),
            .product(name: "RunAnywhereONNX", package: "runanywhere-sdks"),
        ]
    )
]

Package Structure

This repository contains two Package.swift files for different use cases:

File	Location	Purpose
Root Package.swift	`runanywhere-sdks/Package.swift`	For external SPM consumers. Downloads pre-built XCFrameworks from GitHub releases.
Local Package.swift	`runanywhere-sdks/sdk/runanywhere-swift/Package.swift`	For SDK developers. Uses local XCFrameworks from `Binaries/` directory.

For app developers: Use the root-level package via the GitHub URL (as shown above).

For SDK contributors: Use the local package with testLocal = true after running the setup script.

Quick Start

1. Initialize the SDK

swift

import RunAnywhere
import LlamaCPPRuntime

@main
struct MyApp: App {
    init() {
        Task { @MainActor in
            // Register the LlamaCPP module for LLM support
            LlamaCPP.register()

            // Initialize the SDK
            do {
                try RunAnywhere.initialize(
                    apiKey: "<YOUR_API_KEY>",
                    baseURL: "https://api.runanywhere.ai",
                    environment: .production
                )
            } catch {
                print("SDK initialization failed: \(error)")
            }
        }
    }

    var body: some Scene {
        WindowGroup {
            ContentView()
        }
    }
}

2. Generate Text

swift

// Simple chat interface
let response = try await RunAnywhere.chat("What is the capital of France?")
print(response)  // "The capital of France is Paris."

// Full generation with metrics
let result = try await RunAnywhere.generate(
    "Explain quantum computing in simple terms",
    options: LLMGenerationOptions(
        maxTokens: 200,
        temperature: 0.7
    )
)
print("Response: \(result.text)")
print("Tokens used: \(result.tokensUsed)")
print("Speed: \(result.tokensPerSecond) tok/s")

3. Load a Model

swift

// Load an LLM model by ID
try await RunAnywhere.loadModel("llama-3.2-1b-instruct-q4")

// Check if model is loaded
let isLoaded = await RunAnywhere.isModelLoaded

Configuration

SDK Initialization Parameters

swift

try RunAnywhere.initialize(
    apiKey: "<YOUR_API_KEY>",
    baseURL: "https://api.runanywhere.ai",
    environment: .production
)

Environment Modes

Environment	Description
`.development`	Verbose logging, mock services, local analytics
`.staging`	Testing with real services
`.production`	Minimal logging, full authentication, telemetry

Generation Options

swift

let options = LLMGenerationOptions(
    maxTokens: 100,
    temperature: 0.8,
    topP: 1.0,
    stopSequences: ["END"],
    streamingEnabled: false,
    preferredFramework: .llamaCpp,
    systemPrompt: "You are a helpful assistant."
)

Module Registration

swift

import RunAnywhere
import LlamaCPPRuntime
import ONNXRuntime

@MainActor
func setupSDK() {
    LlamaCPP.register()   // LLM (priority: 100)
    ONNX.register()       // STT + TTS (priority: 100)
}

Usage Examples

Streaming Text Generation

swift

let result = try await RunAnywhere.generateStream(
    "Write a short poem about AI",
    options: LLMGenerationOptions(maxTokens: 150)
)

for try await token in result.stream {
    print(token, terminator: "")
}

let metrics = try await result.result.value
print("\nSpeed: \(metrics.tokensPerSecond) tok/s")

Structured Output Generation

swift

struct QuizQuestion: Generatable {
    let question: String
    let options: [String]
    let correctAnswer: Int

    static var jsonSchema: String {
        """
        {
          "type": "object",
          "properties": {
            "question": { "type": "string" },
            "options": { "type": "array", "items": { "type": "string" } },
            "correctAnswer": { "type": "integer" }
          },
          "required": ["question", "options", "correctAnswer"]
        }
        """
    }
}

let quiz: QuizQuestion = try await RunAnywhere.generateStructured(
    QuizQuestion.self,
    prompt: "Create a quiz question about Swift programming"
)

Speech-to-Text Transcription

swift

import RunAnywhere
import ONNXRuntime

await ONNX.register()
try await RunAnywhere.loadSTTModel("whisper-base-onnx")

let audioData: Data = // your audio data (16kHz, mono, Float32)
let transcription = try await RunAnywhere.transcribe(audioData)
print("Transcribed: \(transcription)")

Text-to-Speech Synthesis

swift

try await RunAnywhere.loadTTSVoice("piper-en-us-amy")

let output = try await RunAnywhere.synthesize(
    "Hello! Welcome to RunAnywhere.",
    options: TTSOptions(
        speakingRate: 1.0,
        pitch: 1.0,
        volume: 0.8
    )
)

Voice Agent Pipeline

swift

try await RunAnywhere.initializeVoiceAgent(
    sttModelId: "whisper-base-onnx",
    llmModelId: "llama-3.2-1b-instruct-q4",
    ttsVoice: "com.apple.ttsbundle.siri_female_en-US_compact"
)

let audioData: Data = // recorded audio
let result = try await RunAnywhere.processVoiceTurn(audioData)

print("User said: \(result.transcription)")
print("AI response: \(result.response)")

await RunAnywhere.cleanupVoiceAgent()

Subscribing to Events

swift

import Combine

class ViewModel: ObservableObject {
    private var cancellables = Set<AnyCancellable>()

    init() {
        RunAnywhere.events.events
            .receive(on: DispatchQueue.main)
            .sink { event in
                print("Event: \(event.type)")
            }
            .store(in: &cancellables)

        RunAnywhere.events.events(for: .llm)
            .sink { event in
                print("LLM Event: \(event.type)")
            }
            .store(in: &cancellables)
    }
}

Model Download with Progress

swift

let models = try await RunAnywhere.availableModels()
let model = models.first { $0.id == "llama-3.2-1b-instruct-q4" }!

let task = try await Download.shared.downloadModel(model)

for await progress in task.progress {
    let percent = Int(progress.overallProgress * 100)
    print("\(progress.stage.displayName): \(percent)%")
}

Architecture

The RunAnywhere SDK follows a modular, provider-based architecture that separates core functionality from specific backend implementations:

+------------------------------------------------------------------+
|                         Public API                                |
|        RunAnywhere.generate() / transcribe() / synthesize()       |
+------------------------------------------------------------------+
                               |
+------------------------------------------------------------------+
|                      Capability Layer                             |
|     LLMCapability  |  STTCapability  |  TTSCapability  |  ...    |
+------------------------------------------------------------------+
                               |
+------------------------------------------------------------------+
|                     ServiceRegistry                               |
|          Routes requests to registered service providers          |
+------------------------------------------------------------------+
                               |
          +--------------------+--------------------+
          v                    v                    v
+------------------+  +------------------+  +------------------+
|  LlamaCPP Module |  |   ONNX Module    |  | AppleAI Module   |
|   (LLM: GGUF)    |  |  (STT + TTS)     |  |  (LLM: iOS 26+)  |
+------------------+  +------------------+  +------------------+
          |                    |                    |
          v                    v                    v
+------------------------------------------------------------------+
|               Native Runtime / XCFramework                        |
|          RunAnywhereCore (C++ with Metal acceleration)            |
+------------------------------------------------------------------+

Key Components:

ModuleRegistry - Discovers and tracks registered modules
ServiceRegistry - Routes capability requests to the appropriate provider
Capability Classes - Handle business logic, events, and analytics
EventBus - Pub/sub system for SDK-wide events
ServiceContainer - Dependency injection container

Logging and Observability

Configure Log Level

swift

RunAnywhere.setLogLevel(.debug)
RunAnywhere.configureLocalLogging(enabled: true)
RunAnywhere.setDebugMode(true)
await RunAnywhere.flushAll()

Log Levels

Level	Description
`.debug`	Detailed information for debugging
`.info`	General operational information
`.warning`	Potential issues that don't prevent operation
`.error`	Errors that affect specific operations
`.fault`	Critical errors indicating serious problems

Analytics

The SDK automatically tracks key metrics:

Generation latency and tokens per second
Model load times and memory usage
Error rates by category
User session analytics (opt-in)

Error Handling

All SDK errors are represented by SDKError, which provides:

Typed error cases for each error category
Detailed error descriptions
Recovery suggestions
Underlying error information when applicable

Error Categories

swift

case notInitialized
case invalidAPIKey(String?)
case invalidConfiguration(String)
case modelNotFound(String)
case modelLoadFailed(String, Error?)
case modelIncompatible(String, String)
case generationFailed(String)
case generationTimeout(String?)
case contextTooLong(Int, Int)
case networkUnavailable
case downloadFailed(String, Error?)
case insufficientStorage(Int64, Int64)
case storageFull

Handling Errors

swift

do {
    let result = try await RunAnywhere.generate("Hello")
} catch let error as SDKError {
    switch error.code {
    case .notInitialized:
        print("Please call RunAnywhere.initialize() first")
    case .modelNotFound:
        print("Model not found. Download it first.")
    case .generationFailed:
        print("Generation failed: \(error.message)")
    default:
        print("Error: \(error.localizedDescription)")
        if let suggestion = error.recoverySuggestion {
            print("Suggestion: \(suggestion)")
        }
    }
}

Performance Guidelines

Model Selection

Smaller models (1-3B parameters) work well for most on-device use cases
Q4/Q5 quantization provides good balance of quality and speed
Test on target devices; performance varies significantly by hardware

Memory Management

swift

// Unload models when not in use
try await RunAnywhere.unloadModel()

// Check storage before downloading
let storageInfo = await RunAnywhere.getStorageInfo()
if storageInfo.availableBytes > model.downloadSize ?? 0 {
    // Safe to download
}

// Clean up temporary files periodically
try await RunAnywhere.cleanTempFiles()

Threading

SDK methods are async and safe to call from any context
Heavy operations (model loading, generation) run on background threads
UI updates from event subscriptions should dispatch to main thread

Streaming for Responsiveness

swift

let result = try await RunAnywhere.generateStream(prompt)
for try await token in result.stream {
    await MainActor.run { self.text += token }
}

FAQ

Do I need an internet connection to use the SDK?

No, once models are downloaded, all inference happens on-device. You only need internet for:

Initial SDK authentication
Downloading models
Syncing analytics (optional)

Which models are supported?

The SDK supports:

GGUF models via LlamaCPP (Llama, Mistral, Phi, Qwen, etc.)
ONNX models for STT (Whisper variants) and TTS (Piper voices)
Apple Foundation Models on iOS 26+ (built-in, no download)

How much storage do models require?

Model sizes vary significantly:

Small LLMs (1-3B Q4): 500MB - 2GB
Medium LLMs (7B Q4): 3-5GB
STT models: 50-500MB
TTS voices: 20-100MB

Can I use multiple models simultaneously?

Currently, one LLM can be loaded at a time. STT and TTS models can be loaded alongside LLM models. Use unloadModel() before loading a different LLM.

How do I handle model updates?

Call fetchModelAssignments(forceRefresh: true) to sync the latest model catalog. New versions can be downloaded alongside existing models.

Is user data sent to the cloud?

By default, only anonymous analytics (latency, error rates) are collected. Actual prompts, responses, and audio data never leave the device.

How do I debug issues?

Enable debug mode: RunAnywhere.setDebugMode(true)
Check logs with Pulse integration
Subscribe to error events: RunAnywhere.events.on(.error) { ... }

What's the difference between chat() and generate()?

chat(_:) returns just the text string
generate(_:options:) returns LLMGenerationResult with full metrics

Local Development & Contributing

We welcome contributions to the RunAnywhere Swift SDK. This section explains how to set up your development environment to build the SDK from source and test your changes with the sample app.

Prerequisites

macOS 14.0 or later
Xcode 15.2 or later
CMake 3.21+ (for building native frameworks)

First-Time Setup (Build from Source)

The SDK depends on native C++ libraries from runanywhere-commons. The setup script builds these locally so you can develop and test the SDK end-to-end.

bash

# 1. Clone the repository
git clone https://github.com/RunanywhereAI/runanywhere-sdks.git
cd runanywhere-sdks/sdk/runanywhere-swift

# 2. Run first-time setup (~5-15 minutes)
./scripts/build-swift.sh --setup

What the setup script does:

Downloads dependencies (ONNX Runtime, Sherpa-ONNX)
Builds RACommons.xcframework (core infrastructure)
Builds RABackendLLAMACPP.xcframework (LLM backend)
Builds RABackendONNX.xcframework (STT/TTS/VAD backend)
Copies frameworks to Binaries/
Sets testLocal = true in Package.swift (enables local framework consumption)

Understanding testLocal

The SDK has two modes controlled by testLocal in Package.swift:

Mode	Setting	Description
Local	`testLocal = true`	Uses XCFrameworks from `Binaries/` (for development)
Remote	`testLocal = false`	Downloads XCFrameworks from GitHub releases (for end users)

When you run --setup, the script automatically sets testLocal = true.

Testing with the iOS Sample App

The recommended way to test SDK changes is with the sample app:

bash

# 1. Ensure SDK is set up (from previous step)

# 2. Navigate to the sample app
cd ../../examples/ios/RunAnywhereAI

# 3. Open in Xcode
open RunAnywhereAI.xcodeproj

# 4. If Xcode shows package errors, reset caches:
#    File > Packages > Reset Package Caches

# 5. Build and Run (⌘+R)

The sample app's Package.swift references the local SDK, which in turn uses the local frameworks from Binaries/. This creates a complete local development loop:

Sample App → Local Swift SDK → Local XCFrameworks (Binaries/)
                                      ↑
                         Built by build-swift.sh --setup

Development Workflow

After modifying Swift SDK code:

No rebuild needed—Xcode picks up changes automatically

After modifying runanywhere-commons (C++ code):

bash

cd sdk/runanywhere-swift
./scripts/build-swift.sh --local --build-commons

Build Script Reference

Command	Description
`--setup`	First-time setup: downloads deps, builds all frameworks, sets `testLocal = true`
`--local`	Use local frameworks from `Binaries/`
`--remote`	Use remote frameworks from GitHub releases
`--build-commons`	Rebuild runanywhere-commons from source
`--clean`	Clean build artifacts before building
`--release`	Build in release mode (default: debug)
`--skip-build`	Only setup frameworks, skip swift build
`--set-local`	Set `testLocal = true` in Package.swift
`--set-remote`	Set `testLocal = false` in Package.swift

Running Tests

bash

swift test

Code Style

The project uses SwiftLint for code style enforcement:

bash

brew install swiftlint
swiftlint

Pull Request Process

Fork the repository
Create a feature branch: git checkout -b feature/my-feature
Make your changes with tests
Ensure all tests pass: swift test
Run linter: swiftlint
Commit with a descriptive message
Push and open a Pull Request

Reporting Issues

Open an issue on GitHub with:

SDK version (check with RunAnywhere.version)
Platform and OS version
Steps to reproduce
Expected vs actual behavior
Relevant logs (with sensitive info redacted)

Contact

Discord: https://discord.gg/pxRkYmWh
Email: [email protected]
GitHub Issues: https://github.com/RunanywhereAI/runanywhere-sdks/issues

License

See the repository for license terms. For commercial licensing inquiries, contact [email protected].

RunAnywhere Swift SDK

RunAnywhere Swift SDK

Table of Contents

Overview

Key Capabilities

Features

Language Models (LLM)

Speech-to-Text (STT)

Text-to-Speech (TTS)

Voice Activity Detection (VAD)

Speaker Diarization

Voice Agent Pipeline

Model Management

Observability

Requirements

Installation

Swift Package Manager (Recommended)

Package.swift

Package Structure

Quick Start

1. Initialize the SDK

2. Generate Text

3. Load a Model

Configuration

SDK Initialization Parameters

Environment Modes

Generation Options

Module Registration

Usage Examples

Streaming Text Generation

Structured Output Generation

Speech-to-Text Transcription

Text-to-Speech Synthesis

Voice Agent Pipeline

Subscribing to Events

Model Download with Progress

Architecture

Logging and Observability

Configure Log Level

Log Levels

Analytics

Error Handling

Error Categories

Handling Errors

Performance Guidelines

Model Selection

Memory Management

Threading

Streaming for Responsiveness

FAQ

Do I need an internet connection to use the SDK?

Which models are supported?

How much storage do models require?

Can I use multiple models simultaneously?

How do I handle model updates?

Is user data sent to the cloud?

How do I debug issues?

What's the difference between chat() and generate()?

Local Development & Contributing

Prerequisites

First-Time Setup (Build from Source)

Understanding testLocal

Testing with the iOS Sample App

Development Workflow

Build Script Reference

Running Tests

Code Style

Pull Request Process

Reporting Issues

Contact

License