This app has so many capabilities and it's very easy to use. I mainly recommend this app over others becuse it can 1) output in COCO format (Json file), 2) can do keypoint and mask annotations and 3) can overlay depth maps to images. I love how there are so many shortcuts for most actions, and I can always change the shortcuts to my liking. I also use this app with Apple's side car to label on my iPad. I gave a tutorial- "how to use RectLabel" to 8 of my undergrads, and they all thoguht it was intuitive and easy to use. Customer service has been responsive, super helpful and has always addressed a lot of questions/concerns. The app is ALWAYS getting new bells and whistles added to it. The company listens to my feedback/needs and is willing to add new capabilities accordingly. I am very pleased with RectLabel, and would highly recommend it.