Duo Mobile works with Duo Security's two-factor authentication service to make logins more secure. The application generates passcodes for login and can receive push notifications for easy, one-tap authentication on your iPhone, iPad, or Apple Watch.

Additionally, you can use Duo Mobile to manage two-factor authentication for other application and web services that make use of passcodes.

Note: For Duo accounts, Duo Mobile needs to be activated and linked to your account before it will work. You will receive an activation link as part of Duo's enrollment process. You may add third-party accounts at any time.

License agreements for third-party Open Source libraries used in Duo Mobile can be found at

What’s New

Version 3.29.1

- Miscellaneous bug fixes and improvements.

Ratings and Reviews

3.0 out of 5
308 Ratings

308 Ratings

marleeRS ,

So difficult to redownload

I have never disliked an app so much. I need it to sign into my school email and account. I go to OSU and take my classes online. I got a new phone and redownloaded the app and I CAN NOT SIGN IN. it’s impossible and so difficult. There isn’t even an option to sign in. It’s either new accounts or restore but the restore only talks about backing your iCloud which I didn’t do before my phone broke. I can’t sign in to pay my tuition, I can’t sign in to do my classes, I can’t do anything. It’s insane and so difficult. Only use this app if you absolutely have to. Also it’s just annoying because you are forced to always have your phone with you just to check your email or login to do my school work or for whatever reason you are using it. Now I have to get outside help to someho figure this out otherwise I will be dropped from my classes for not paying my tuition.

Developer Response ,

Hi marleeRS, sorry to hear about your difficulties with the app. Please contact your university's help desk or IT support and ask them to help you activate Duo Mobile on your new device. They may be able to send you a link via text message to activate the app on your new phone.

mnkjrdgyrgh ,

A great option for 2FA

Seeing all the low ratings based on a business’ or university’s decision to apply additional security to their networks, I had to add my two cents. It is 2FA, not Duo, about which most are railing. If you don’t like 2FA, rid the world of hackers and thieves that will use every available means to get into any network they can. Until you accomplish that, accept the fact that for those trying to secure a network, 2FA is a necessary precaution, much like a deadbolt on a door. And Duo is a good method for applying 2FA. We primarily use Duo Push for accessing our systems and it works very well.

Unrelated note: Duo works much better than this rating system, which will tell you after the fact that a nickname has been used but won’t suggest one that hasn’t been...

Developer Response ,

Thank you for your review!

icewalker90 ,

Love it - but Apple Watch app seems to have a bug

Edit - issue seems to have been fixed. Also, leaving the Duo app running in the background on the phone, which I hadn’t been doing before, helps.

I implemented the free tier of Duo to safeguard my personal VPN against unauthorized access. It works great and having an Apple Watch app is neat too. But recently, I noticed that my watch app wouldn’t generate passcodes anymore. Push notifications to the Watch still work. Restarting the watch seems to work once and then it won’t give codes anymore.

I couldn’t find a way to send feedback in the app itself, so I decided to leave a review. Hope this minor bug can be ironed out so I can get back to enjoying that extra convenience!

Developer Response ,

Thank you for letting us know. I will share this with our development team.

Update: One of our team members indicated that it can sometimes take several moments to generate a code on the watch. Can you please try to generate a code, wait several moments, and let us know if that works?


Duo Security, Inc.
23.7 MB

Requires iOS 11.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, French, German

Age Rating
Rated 4+
© Duo Security, Inc.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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