iOS – Sign in with Device

Cotter's Passwordless SDK authenticates your user using the FIDO protocol. It allows a seamless, fast, and secure way for your user to login to your iOS App. Authenticate your users in 4 simple steps:

Sign in with Device

In this guide we'll allow users to Sign In with Device using Cotter's SDK.

Step 1: Import Cotter as a dependency

Head to and allow Trusted Devices in the dashboard.

We use Cocoapods as our SDK host. Add pod 'Cotter' to your podfile then run pod install.

Step 2: Initialize Cotter

In your app's AppDelegate.swift, initialize Cotter with your API keys.

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
    launchOptions: launchOptions,
    apiSecretKey: <your-secret-key>,
    apiKeyID: <your-api-id>

Step 3: Register your user

To register, simply call the following function anywhere in your app. Make sure you do import Cotter at the start of the swift file.

  identifier: <user-email>

Step 4: Logging in

When a user logs in, call the following function in your view controller

Passwordless.shared.parentVC = self
  identifier: <user-email>, 
  cb: { (token: CotterOAuthToken?, err:Error?) in
    if err != nil {
        // case 1: handle error as necessary
    if token == nil {
        // case 2: user is unauthorized
    // case 3: user is authorized

Then you can handle 3 cases mentioned in the comments in any way you like.

👉 Next steps

That's it! You have successfully build a seamless, fast, and secure login mechanism with Cotter.

Integrate Cotter's push notification services

pagePush Notification

Verify User's Email or Phone Number

pageSign In with Email/Phone Number

Last updated