Best video-calling iOS apps: Skype

FREE - Skype for iPhone & Skype for iPad (Compatible with iPhone, iPad, and iPod touch)
The Skype video-calling app is ubiquitous, and this fact alone gives it enormous usefulness: a lot of people and companies are on it. The beauty of Skype is that it can be used to make video calls, but also doubles up as a low-cost alternative for international calling.
Its interface is very easy to understand and makes it easy to use, no matter what platform you're using. As Skype can be used on all different types of platforms, it's a great alternative to FaceTime for making video calls.
You'll need a Skype account to use the app, but after Microsoft's acquisition of Skype back in 2011, there's far greater integration with other accounts, such as Microsoft's very own accounts, which can be used to sign into Skype.