Note:
Preview CC is no longer available for download or actively maintained as of October 2017. Additionally, the Device Preview functionality has been removed from the October 2017 release of Photoshop CC. If you have a previously-downloaded version of Preview CC on your iOS device, you can continue to use it on an as-is basis with earlier versions of Photoshop.

Adobe Preview CC is a Photoshop companion iOS app that lets you preview designs in real-time as you edit them in Photoshop. Using Preview CC, you can make sure designs appear on actual devices exactly how you want them to appear. Preview CC speeds up the design process and reduces the time required to test on multiple screen sizes.
If you have a document with artboards, Device Preview attempts to show you the correct artboard by matching the size and position of the artboard with the size of the connected device.

What is Preview CC and what does it do?
Do I need to use Adobe Photoshop to use Preview CC?
Do I need a Creative Cloud account to use Preview CC?
You need either a free or paid Creative Cloud membership to use Preview CC. If you’re not already a member, you can sign up for free Creative Cloud membership.
Can I download Preview CC for free?
Where do I go for more help and support with Adobe Preview CC?
Visit the Device Preview Help page or post a question to the Device Preview forums.
Does Preview CC work with any version of iOS?
Which version of Photoshop does Preview CC work with?
Preview CC works with Photoshop CC 2015, which is available as a free update for Creative Cloud members. See Download Photoshop to download Photoshop CC 2015.
How do I connect Preview CC to Photoshop?
Do I need an Adobe ID to use Adobe Preview CC?
How many devices can I connect to Photoshop CC simultaneously?
How do I connect using a USB connection?
To begin with, download and install iTunes on your computer. Now, ensure the following before connecting Preview CC to Photoshop using a USB port:
- Preview CC is up and running on your device.
- The USB cable is connected to the computer running Photoshop.
- The Device Preview panel in Photoshop is open.
How do I connect to Photoshop over Wi-Fi?
How do I preview a mobile app design simultaneously on two devices?
Can I swipe to navigate the artboards on my device?
Yes, you can swipe to navigate and preview different artboards. Preview CC lets you swipe through artboards based on the width. For example, if you have a PSD that has artboards for different iOS sizes, and you connect an iPhone 5, Preview CC will automatically display the first iPhone 5 artboard. You can also select a specific artboard from the app's Nav menu and navigate through the artboards that match the width of the selected one.