Duo Mobile on iOS

Duo Mobile version 4 was released on October 11, 2021.

Duo Mobile version 3 information remains available for users on older iOS versions who can't upgrade to the latest Duo Mobile release.

View the Duo Mobile v3 iOS Guide
Duo Mobile v4 Push Prompt

The Duo Mobile application makes it easy to authenticate — just tap “Approve” on the login request sent to your iPhone. You can also quickly generate login passcodes, even without an internet connection or cell service.

If you need assistance installing or using Duo Mobile, please contact your organization's IT Help Desk or Duo administrator.

Changes to Duo Mobile

We've redesigned Duo Mobile to give you an updated login experience. Learn more about what's new to Duo Mobile version 4 in this video walkthrough:

Install Duo Mobile

Find the latest version of Duo Mobile in the App Store.

Supported Platforms: The current version of Duo Mobile supports iOS 13.0 and greater.

To see which version of Duo Mobile is installed on your device, go to the iOS Settings menu, then scroll down and tap Duo Mobile. The "System Info" section shows the app version.

Activate Duo Mobile for the First Time

When you enroll in Duo for the first time and choose to add an iOS device or use Duo Push, you're shown a barcode to scan with the Duo Mobile app to complete activation.

Scan Barcode to Activate

Launch Duo Mobile and step through the introduction screens.

Duo Mobile First-Time Launch

To proceed with adding your initial Duo account to Duo Mobile, tap Use a QR code.

Add Account with QR Code

Use your camera to scan the barcode shown by Duo Enrollment in your browser. If you're prompted to allow Duo Mobile permission to use your device camera, please grant it.

Scan Duo QR Code

Give the new account a name to complete adding it to Duo Mobile.

Name the New Duo Account

It's a good idea to take a few minutes to practice approving and denying Duo authentication requests if you haven't used Duo before. Tap Practice now to go through some training screens like this one. If you feel comfortable using Duo Mobile to log in to applications you can tap Skip.

Duo Mobile Practice

Respond to Duo Mobile even faster by enabling notifications. You'll see new Duo Push requests when they arrive at your device, and can approve or deny from the notification without opening the app. Tap Allow notifications to permit notifications from Duo Mobile in iOS settings.

Enable Duo Mobile Notifications

Return to the accounts list to exit the new account process.

Duo Mobile Activation Done

You'll see your newly-added Duo account in the accounts list. Now you're able to respond to Duo Push authentication requests, or generate passcodes to log in to applications.

Duo Mobile Account List

Duo Push

If you choose to authenticate with Duo Push, you'll get a login request sent to your phone — just press Approve to authenticate.

Duo Push Request on iOS

If you get a login request that you weren't expecting, press Deny to reject the request. You’ll be asked if this was a suspicious login. If you aren't trying to log into an application or service protected by Duo and don't recognize the request, tap Yes to notify your organization's Duo administrator. If you made a mistake but the login isn't suspicious, tap No to deny the request without reporting it.

Duo Mobile Deny Options

Duo Push and Notifications

You can respond to Duo Push requests from the iOS lock screen or banner notification. The actions presented to you when you respond to the notification depend on your organization's Duo policy settings, such as whether or not you can approve the login request without PIN or biometric verification.

Perform a firm longpress on the Duo Mobile notification from the lock screen to reveal the "Approve" or "Deny" actions. Tap an action and supply your passcode or biometric verification (face or fingerprint) to complete the action.

Duo Mobile Lockscreen Notification

When your screen is unlocked, long-press or swipe down on the Duo Mobile banner notification received to reveal the authentication actions.

Duo Mobile Banner Notification

On devices that do not feature 3D Touch, swipe left on the Duo Mobile notification to reveal the actions.

Face ID and Touch ID

Your organization may require biometric verification when you approve a Duo Push reuest. You can approve Duo authentication requests with Face ID if your device supports it.

The first time you receive a Duo Push request on your iOS device which requires biometric verification, you'll be prompted to grant Face ID permission to the Duo Mobile app. Tap OK to proceed.

Scan your face in the same manner that you use to unlock your device to approve the Duo login request.

Duo Mobile Face ID Prompt

If your first try isn't successful, tap Try Face ID Again to scan your face again.

If you're not able to approve the login request with Face ID or if you did not grant Duo Mobile permission to use Face ID, you can approve the Duo authentication request using the device's passcode.

Duo Mobile Face ID Retry Scan

If you're using a Touch ID capable iOS device you can scan your fingerprint to approve Duo authentication requests.

If you're not able to scan your fingerprint using the Touch ID sensor you can also approve the Duo authentication request using the device's passcode.

Apple Watch

See our Apple Watch guide.


Tap an account to get a one-time passcode for login. This works anywhere, even in places where you don't have an internet connection or can't get cell service.

If the account is for a Duo-protected service or application (meaning you enrolled this device into Duo and activated the app for Duo Push), then the passcode shown is valid until used. Tap Refresh Passcode to generate a new Duo passcode.

Duo Passcode Generation in Duo Mobile

If the account is a third-party OTP account (meaning you logged into another service like Gmail and added this device as an authenticator app), then you'll see a 30 second countdown indicator underneath the passcode. If you don't use that passcode before it expires then the account refreshes with a new passcode and the countdown begins again.

Third-Party Passcode Generation in Duo Mobile

If you need to use the passcode shown in Duo Mobile in another mobile app tap Copy and paste it into the other app.

Add More Accounts to Duo Mobile

To add additional accounts to Duo mobile, tap Add in the upper right of your accounts list to go to the account type selector.

Duo Mobile Account Type Selector

If the new account you want to add shows you a QR code to scan with an authenticator app, tap Use QR code from the Add account list. Scan the barcode with your camera to add the account to Duo Mobile.

Duo Mobile Account Activation

You can also choose the type of account you want to add from the list, and then choose to add that account by scanning a QR code or by entering an activation code you receive from that application. Learn more about adding third-party accounts to Duo Mobile

Security Checkup

Duo Mobile's Security Checkup verifies device settings against Duo's recommended security settings, and lets you know if any of your device's settings don't match.

For example, this iOS device doesn't have the latest OS update installed and doesn't have Touch ID or Face ID enabled:

Duo Mobile Security Checkup - Issues Found

Tap on any detected issue to learn more about that particular setting and how you can update your device with the recommended configuration.

This iOS device has up-to-date software and all of Duo's recommended security settings configured:

Duo Mobile Security Checkup - No Issues

Tap the menu and go to Security Checkup in Duo Mobile to view your device's security status at any time.

Third-Party Accounts

Duo Mobile supports passcode generation for logging in to third-party TOTP accounts, like Google and Dropbox. Learn more »

Edit Accounts

To make changes to an account in your accounts list, tap the account to expand it, and then tap the three dots in the upper-right corner of the account card to bring up the account options.

Edit Account in Duo Mobile

Tap Move to reorder your accounts list (shown when you have more than one account in Duo Mobile). Use the up or down arrows shown to the left of each account's name (or tap and hold the icon on the right side of the account card) to change an account's position in the list. Tap Done when you've finished reordering your accounts.

Tap Rename to change the name of an account. Enter a new name for the account and then tap Save to apply the new name.

Remove an account by tapping Delete. When you delete an account you can no longer use it to log in, and it's also removed from your Duo Mobile backup so you can't restore it later. If you're sure you want to remove this account, tap Delete on the confirmation message. Tap Cancel if you don't want to delete the account.

Backup & Restore

Your Duo Mobile account information is backed up automatically when you enable iCloud Backup on your phone or create an encrypted iTunes backup, and can be used to restore your Duo Mobile accounts only on the same device. These backups can't be used as is to migrate your Duo accounts to a new phone.

If your administrator enabled Duo Mobile's backup and restore functionality and you previously backed up your Duo-protected accounts from the app to iCloud or an encrypted iTunes backup you can restore your accounts to Duo Mobile on a new iOS device via the guided recovery process. You can also opt-in to third-party account backup and recovery.

See the full Duo Restore guide for iOS.

Duo Mobile Appearance

Adaptive View

The accounts list in Duo Mobile adapts to you. If you rotate your device into a landscape view, your Duo Mobile accounts list rotates as well.

Duo Mobile Landscape View

The individual accounts shown in the list change appearance as well, showing the full account information when you just have a few accounts, and switching to a minimized account view when you have many accounts to minimize scrolling in the app.

Standard and Compact Duo Mobile Account Views

Dark Mode

Duo Mobile's dark mode depends on your iOS system settings. There is no in-app toggle to enable dark mode. If your device has the system-wide dark setting enabled, Duo Mobile automatically switches to dark mode.

Duo Mobile Dark Mode Screens

You can enable dark mode on iOS in a few different ways:

  • Go to SettingsDisplay & BrightnessAppearance and select Dark.
  • Swipe down on the right side of the screen to open Control Center. Press and hold the Brightness control to access additional options, and tap the Dark Mode button.


Tap the menu icon to access additional settings. From the Settings you can enable backup of your third-party Duo Mobile accounts and opt in to or out of sending Duo Mobile usage data to Duo. Review Duo Mobile privacy information at the Duo Knowledge Base.


See the Common Issues guide for additional troubleshooting tips, or visit the Duo Knowledge Base. If you aren't able to resolve your Duo Mobile issue, contact your organization's Duo administrator or Help Desk.

Push Troubleshooting

If you are logging in to a Duo-protected application, but you aren't receiving an expected Duo Push authentication request, try closing Duo Mobile and reopening it. Duo Mobile checks for pending push requests whenever it's opened. If this doesn't fix it, see the Duo Knowledge Base for additional iOS troubleshooting steps.