Over 1.4 million different apps have been downloaded more than 100 billion times in Apple’s iPhone/iPad App Store. Those numbers are mind blowing and prove that iOS devices – and smart devices in general – are being put to use around the world as serious tools.

Filmmakers are no different. If you have an iPhone sitting in your pocket right now, you have access to one of the most versatile tools you could ever find on a film set. It can do everything from calculate depth-of-field to help you level a camera. The possibilities are endless.

The only problem is, how do you find the most useful apps out of hundreds of thousands? Well, I went ahead and did some of the legwork for you. Below are the best and most useful cinematography apps to put on your smartphone or tablet to make life on set easier for you: