With the recent release of iOS 10, Apple has rolled in a feature in iMessage which allows you to use stickers in your messages. I’m currently putting together a sticker pack app for a friend of mine and noticed all the iMessage App icon size requirements. Since I mainly work in Sketch, I’ve put together a quick template and open sourced it on GitHub.
If you’re working on a iMessage sticker pack app and use Sketch, this might be helpful for you. All the Artboards should export the correct pixel sizes with a pretty descriptive file title to help distinguish where to place them in Xcode. You can grab the file on GitHub. Enjoy!