Learn how to prototype web and mobile apps

How to test your prototypes on multiple devices

Test your prototypes on multiple devices with Justinmind. In this tutorial you will learn how to view and test web and mobile prototypes on the actual device.

The first thing you need is the Justinmind app, available for free both for iOS and Android.


When you click on “View on device”the prototype gets published in your Justinmind online account.Simulate your web and mobile app prototypes with Justinmind

At this point, you just need to open your mobile app, log in using your Justinmind account and tap on “View on device”: the prototype will be downloaded and the simulation will start.

In the mobile app you will also find a list of all the prototypes published in your Justinmind account. Prototypes with a red dot next to them have not been downloaded to the mobile device yet. To download them and run the simulation, just tap on them.

Test your interactive prototypes on your devices

As for the prototypes that have already been downloaded to the device (without the red dot),  their simulation will run after checking for any update. They can be viewed offline as long as you don’t log out of the app.

When you invite reviewers, they will receive an email with a link to the prototype and a token. To review the prototype in the mobile app, they just have to click on “Don’t have a password?” and introduce the token received in the email. They will then be able to view your prototype.


Invite reviewers to check your prototypes on multiple devices

Next tutorial > Add comments to your prototypes


  1. Simon

    October 13, 2014 at 11:34 am

    It would be great if you would let me host the prototypes myself and still add them to the app. Since prototypes are the result of a lot of work and research I want to know exactly where my files are and have full control over it (that includes the server).

    Please add an option to download prototypes from other servers!!!

  2. midy Says :

    January 7, 2015 at 4:15 am

    There is a function called ” Connect to your own Justinmind Server ” on Justinmind App.
    How do I build one “ my own Justinmind Server ” , and do I need my account on my own server?
    Thank you.

    • Lidia Rodriguez

      March 4, 2015 at 11:08 am

      Yes, you need to sign up with a Justinmind account in order to use it.

  3. Victor

    January 26, 2015 at 7:25 am

    Not quite I am using the correct way to test…. but I was making a prototype for 6 plus, I clicked “view on device” to my 6plus, the app size on my phone was much bigger then it should show, it zoomed in like I was making for ipad mini…?

    • Lidia Rodriguez

      March 6, 2015 at 10:15 am

      You can send your prototype to jim.support at justinmind.com so we can check your prototype and solve the issue!

    • Sierra Kilo

      May 15, 2015 at 3:25 am

      Was there a solution to this question? I have the same issue.

      • Lidia Rodriguez

        July 3, 2015 at 10:49 am

        Hi Sierra, check that you don’t have the ‘zoomed view’ activated on your device. There’s a bug regarding this that will be solved with the next app release.

  4. Suba

    June 9, 2015 at 3:45 pm


    I have made an iphone 6 prototype however the screens appear bigger on the device compared to that shown ion the desktop simulation. Is there a way to resolve this?

    Also, if I want to view the prototype on an iphone 5 can I do this without creating a another prototype?

    • Lidia Rodriguez

      July 3, 2015 at 10:11 am

      Hi Suba, there is a bug regarding Zoomed view on iPhone 6 that it’s going to be fixed in the new app update. For the moment, you can disable the zoomed view and the prototype should have the correct size.
      To create an iphone 5 template, you can create an adaptative layout or a responsive design. Check this tutorial section: http://www.justinmind.com/support/?s=responsive

  5. Jack

    June 21, 2015 at 7:16 pm

    Comparing to other mobile prototyping tools out there, Justinmind is really a better tool to prototype mobile device after I play with it for a day. At this point, I’d like to invite a reviewer to test drive my prototype in his mobile device, but I’m lost on the tool (Justinmind Prototyper Pro Edition v6.6.1 for OS X) on finding such “invite reviewer” page where I can add my reviewer’s email address so he can receive the token to test my prototype on his mobile device.


    • Lidia Rodriguez

      June 22, 2015 at 10:05 am

      You have to add them as users on your account, then go to the prototype and choose ‘Invite reviewers‘ and add the user as a reviewer for the prototype.

  6. Jack

    June 22, 2015 at 3:10 pm

    I finally found it via Share > + invite reviewer. But I didn’t add them to users before sending them invite via the tool. Will they still get the invite email with token and test drive my prototype on their device?


  7. Jack

    June 22, 2015 at 5:06 pm

    I realize by adding reviewers email address via Share > + invite reviewers, they will be added to users list automatically. Thanks

  8. george gonzalez

    July 10, 2015 at 5:49 pm


    I have a question- can I switch a iphone device into a android device from the menu?

    Or would I have to create a new prototype

    • Danielle Schneider

      July 10, 2015 at 5:59 pm

      Hi George,

      You can’t change the base image to another device after you’ve started prototyping, but you can change the device that appears while simulating, which you can do by clicking on the ‘gear’ symbol next to the green ‘Simulate’ bar.

  9. Eugene

    July 27, 2015 at 8:48 pm

    Hi – two questions:

    1) Inside the Justinmind iOS app, it lists my prototype and says “No icon”. Within Justinmind Prototyper desktop, I have clicked on the Settings button and found the App Icon and clicked Add Image. However, it still did not appear when I returned to the Justinmind app. What should I try? Does it matter what size image I upload?

    2) Is there a way I can “install” my prototype as an app on the iPhone? Somehow (forgot how) I was able to download the example “Play Me” app on my iphone, complete with app icon. How can I do this with my own prototype so my client can see and launch it like a normal app?

    Thanks! Eugene

    • Danielle Schneider

      July 28, 2015 at 12:43 am

      Hi Eugene,

      You can add the icon by going to the simulation settings. Make sure that you save and replace the published version before returning to the mobile version, as it needs to sync and be replaced.

      As for downloading the standalone app, this is not possible. Currently, you must use the Justinmind application to view your prototype on your device.

      • Eugene Chen

        July 28, 2015 at 1:51 am

        Thanks for the reply Danielle. Just wondering – if it is possible for the Playme example app, is there some workaround or trick to get it to work for our prototypes? Or will you be adding this feature soon (I believe other tools do support it). Thanks!

        • Danielle Schneider

          July 29, 2015 at 8:25 pm

          Hi Eugene,

          I’m not quite sure how you would have downloaded the Playme example. If possible, could you describe how you did so?

  10. Elena

    August 12, 2015 at 9:21 am

    Good morning,

    I have my Prototipe done with Just in mind but I can´t see it in my device. Have I contract the Pro version to do that? The file is a .vp and I would like to change it to a pdf, video or see in my mobile. I wait for your answer.

    Thank you,

    Elena Cortés

    • Lidia Rodriguez

      August 12, 2015 at 9:44 am

      Hi Elena, with the free version, you can take screenshots of your prototype but not see it on device.

      • Elena

        August 12, 2015 at 9:57 am

        Hi Lidia,

        And how much it cost if I just want the option of see it on device?.

        Thank you for your quick answer,