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An iOS client for Speechly SLU API
.package(url: "https://github.com/speechly/ios-client.git", from: "0.3.0")


Complete your touch user interface with voice

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iOS client for Speechly SLU API

Release build License

This repository contains the source code for the iOS client for Speechly SLU API. Speechly allows you to easily build applications with voice-enabled UIs.


Swift package dependency

The client is distributed using Swift Package Manager, so you can use it by adding it as a dependency to your Package.swift:

// swift-tools-version:5.3

import PackageDescription

let package = Package(
    name: "MySpeechlyApp",
    dependencies: [
        .package(name: "speechly-ios-client", url: "https://github.com/speechly/ios-client.git", from: "0.3.0"),
    targets: [
            name: "MySpeechlyApp",
            dependencies: []),
            name: "MySpeechlyAppTests",
            dependencies: ["MySpeechlyApp"]),

And then running swift package resolve.

Xcode package dependency

If you are using Xcode, check out the official tutorial for adding package dependencies to your app.

Client Usage

The client exposes methods for starting and stopping the recognition, as well as a delegate protocol to implement for receiving recognition results. The startContext() method will open the microphone device and stream audio to the API, and the stopContext() method will close the audio context and the microphone.

Note: the application's Info.plist needs to include key NSMicrophoneUsageDescription to actually enable microphone access. The value is a string that iOS presents to the user when requesting permission to access the microphone.

import Foundation
import Speechly

class SpeechlyManager {
    let client: Speechly.Client

    public init() {
        client = try! Speechly.Client(
            // Specify your Speechly application's identifier here.
            appId: UUID(uuidString: "your-speechly-app-id")!,
            // or, if you want to use the project based login, set projectId.
            //projectId: UUID(uuidString: "your-speechly-project-id")!,

        client.delegate = self

    public func start() {
        // Use this to unmute the microphone and start recognising user's voice input.
        // You can call this when e.g. a button is pressed.
        // startContext accepts an optional `appId` parameter, if you need to specify it
        // per context.

    public func stop() {
        // Use this to mute the microphone and stop recognising user's voice input.
        // You can call this when e.g. a button is depressed.

// Implement the `Speechly.SpeechlyDelegate` for reacting to recognition results.
extension SpeechlyManager: SpeechlyDelegate {
    // (Optional) Use this method for telling the user that recognition has started.
    func speechlyClientDidStartContext(_: SpeechlyProtocol) {
        print("Speechly client has started an audio stream!")

    // (Optional) Use this method for telling the user that recognition has finished.
    func speechlyClientDidStopContext(_: SpeechlyProtocol) {
        print("Speechly client has finished an audio stream!")

    // Use this method for receiving recognition results.
    func speechlyClientDidUpdateSegment(_ client: SpeechlyProtocol, segment: Segment) {
        print("Received a new recognition result from Speechly!")

        // What the user wants the app to do, (e.g. "book" a hotel).
        print("Intent:", segment.intent)

        // How the user wants the action to be taken, (e.g. "in New York", "for tomorrow").
        print("Entities:", segment.entities)

        // The text transcript of what the user has said.
        // Use this to communicate to the user that your app understands them.
        print("Transcripts:", segment.transcripts)

User Interface Components

The client library also includes a couple of ready-made UI components which can be used together with Speechly.Client.

MicrophoneButtonView presents a microphone button using build-in icons and visual effects which you can replace with your own if needed. The microphone button protocol can be forwarded to Speechly.Client instance easily.

TranscriptView visualizes the transcripts received in the speechlyClientDidUpdateSegment callback, automatically highlighting recognized entities. For other callbacks, see the protocol docs.

These can be used, for example, in the following way (UIKit):

import UIKit
import Speechly

class ViewController: UIViewController {
    private let manager = SpeechlyManager()

    override func viewDidLoad() {
        view.backgroundColor = UIColor.white
        manager.addViews(view: view)

class SpeechlyManager {
    private let client: Speechly.Client
    private let transcriptView = TranscriptView()

    private lazy var speechButton = MicrophoneButtonView(delegate: self)

    public init() {
        client = try! Speechly.Client(
            appId: UUID(uuidString: "your-speechly-app-id")!
        client.delegate = self
        speechButton.holdToTalkText = "Hold to talk"
        speechButton.pressedScale = 1.5
        transcriptView.autohideInterval = 3

    public func addViews(view: UIView) {

        transcriptView.snp.makeConstraints { (make) in

        speechButton.snp.makeConstraints { (make) in

    public func start() {

    public func stop() {

extension SpeechlyManager: MicrophoneButtonDelegate {
    func didOpenMicrophone(_ button: MicrophoneButtonView) {
    func didCloseMicrophone(_ button: MicrophoneButtonView) {

extension SpeechlyManager: SpeechlyDelegate {
    func speechlyClientDidUpdateSegment(_ client: SpeechlyProtocol, segment: Segment) {
        DispatchQueue.main.async {
            self.transcriptView.configure(segment: segment, animated: true)

For a SwiftUI example, check out the ios-repo-filtering demo app.


Check out official Speechly documentation for tutorials and guides on how to use this client.

You can also find the speechly-ios-client documentation in the repo.


If you want to fix a bug or add new functionality, feel free to open an issue and start the discussion. Generally it's much better to have a discussion first, before submitting a PR, since it eliminates potential design problems further on.


  • Swift 5.3+
  • Xcode 12+
  • Make
  • swift-doc

Make sure you have Xcode and command-line tools installed. The rest of tools can be installed using e.g. Homebrew:

brew install swift make swiftdocorg/formulae/swift-doc

Building the project

You can use various Make targets for building the project. Feel free to check out the Makefile, but most commonly used tasks are:

# Install dependencies, run tests, build release version and generate docs.
# Won't do anything if everything worked fine and nothing was changed in source code / package manifest.
make all

# Cleans the build directory, will cause `make all` to run stuff again.
make clean

About Speechly

Speechly is a developer tool for building real-time multimodal voice user interfaces. It enables developers and designers to enhance their current touch user interface with voice functionalities for better user experience. Speechly key features:

Speechly key features

  • Fully streaming API
  • Multi modal from the ground up
  • Easy to configure for any use case
  • Fast to integrate to any touch screen application
  • Supports natural corrections such as "Show me red – i mean blue t-shirts"
  • Real time visual feedback encourages users to go on with their voice


Stars: 61
Last commit: 2 days ago

Release Notes

Release 0.3.0
2 days ago
  • Renamed all central terms, dropped Speech prefix to unify naming with other SDKs
  • Refactored UI components to be easily usable in SwiftUI, with UIViewRepresentable wrapper
  • Changed the gRPC streaming semantics so that the existing stream is reused if possible

Swiftpack is being maintained by Petr Pavlik | @ptrpavlik | @swiftpackco