Opinit allows users to react to posts and images with 5 different emojis (from happy to angry). Opinit uses a tile design to display posts which I find really cool, especially the way the posts/images open up! It's currently an open BETA that's available on the iOS App store. Opinit has been featured in several articles and looks like it's growing quite quickly. Love the app would definitely recommend it to others!
Penta