I used the Sketch "Delicious" free UI Kit for a food recipes app. It includes 11 pixel-perfect screens. I just added Proto.io interactions and created a great prototype! This Delicious UI Kit was designed by Robert Anitei Sketch source: https://www.sketchappsources.com/free-source/1765-delicious-ui-kit-sketch-freebie-resource.html

The Flipboard animation created using states.

I used part of the "Laundry App UI Kit Sketch Resource" design that was designed by Satheesh Kumar at: https://www.sketchappsources.com/free-source/3397-laundry-app-ui-kit-sketch-freebie-resource.html to create a quick prototype

3 different counters using variables 1. A standard counter 2. A counter from the number of seconds the user sets 3. A countdown

A news app prototype with a reading percentage indicator upon scrolling. Includes variables that calculate the scroll position in % and update the loader fill percentage. Fill free to import!

Full app prototype for IslandBreak Bahamas travel Guide - Discover & explore the islands of The Bahamas with a smart mobile travel guide. http://islandbreakapp.com/

A calendar picker concept based on Ramotion's example on Dribbble, https://dribbble.com/shots/1782092-Survey-Platform-Design

The recently released Google Inbox app is a re-thinking of the email inbox experience that beautifully demonstrates Google's material design interactive animation language. This prototype focuses on the compose button's animation. Click the + to reveal a new state where a wave of buttons and labels float up, and the + becomes a pencil icon. It uses two states, with staggered animations.