Simple, Clean UI
Spring's user interface was very simple and clear in communication of each feature's purpose, perhaps because app strictly limits the number of functions compared to the other photo editing apps. The app uses circles and lines to pivot the body position and bar to adjust the density for all three features. It is very easy to learn and navigate. The color scheme with green and blue also gives a fresh tone that reminds the user of actual 'spring'(blooming) theme.
Easy tweak to an image
I love how only few touches seamlessly modify an image. It solves lots of existing problems on the mobile photo editing apps, such as making overly detailed, tiny modifications with a fingertip. All I need to do is to pivot the circle and lines to my body position and scroll the bar to adjust the density. Because the user is doing the macro control and the app is doing the micro touches, it saves much time on the user's end by making it easy to-go and un-do. This feature guarantees much better quality requiring less amount of time, stress, and efforts from the user.
Direct Sharing to Social Media
After editing a photo, the app allows the user to directly share and add a comment to the edited photo to the social media. Surprisingly, many simple apps I use forget the 'share' feature. The benefits of having direct 'share' is not only because it is a shortcut, but it also maintains the original image quality. As an avid user of Spring, I am thankful that the app has a direct sharing feature, because it saves much of my efforts every time I use this app for the same purpose -- to share on the SNS.
Obviously, the quality.
Whereas many other photo editing apps lower down the image quality by reducing the number of pixels, Spring keeps the original image quality even after edited. Not only it provides a solution, it gives in high quality. As image quality is highly important when it comes to a photo, the resulting photo is seamless, looks original, absolutely with no line of distortion. As a computer science student, I wondered what the algorithm was behind in choosing which pixel to copy over and the way to keep the original quality. The algorithm seemed similar all across the three features, which means it would require much less work from the engineers' side to maintain and easier to implement other potential features along the line. Happy medium.