Yep! As long as you use the same email address, you can access your account on both the JibJab.com website and the mobile apps on both iOS and Android.
The faces you've created on JibJab.com are also available in the mobile app, and vice-versa. Any Ecards or videos you create in the mobile app will also be visible in the "My Ecards" section of our website.
If you aren't able to access all of your heads in the app or on our website, you may be logged into two different accounts. Make sure you're logged in to the correct account on your computer and your mobile device in order to share heads and cards across devices.