Skala Preview

Skala Preview is the fastest way to send pixel perfect, colour perfect design previews from your Mac to your iPhone or iPad.
Previewing your design in situ lets you test tap sizes, text sizes, colour, contrast and ergonomics, all at a time where changes can be easily made -- during the design process.

It closes the loop, meaning you can iterate faster to a better final design.
Please note: This app requires the free Skala View iOS app.
What's new in this version:
Improved interface. Improved icon. Improved OS X Yosemite support. Improved HEX parsing support (dec0de, #dec0de and ##dec0de are now all accepted). Improved undo handling. Improved format names. Added Swift support.