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

A clean product card carousel as seen on: https://www.sketchappsources.com/free-source/3173-product-card-view-sketch-freebie-resource.html Infinite loop scrolling added

Popup message on iPhone simulation Message appears in 2 seconds after screen loads / swipe left to dismiss / tap message app to run again

Interactive banner with video of Google TV's home page. Must click to enable key presses used on a TV focus interaction model. The menu can be navigated but is only actionable for "For You" on the home page. Switching focus to the banner will enable additional UI and pausing on left/right interactions will allow for video playback with sound. No interactions below the banner are actionable.

Basic menu using a moving focus model for TV apps such as Hulu, Youtube etc. Key presses are used to map interactions which would be mapped to physical remote controls for live demos. Note: Must click the canvas to enable key presses, this seems to be a common restriction with most prototyping tools when building key press focus interaction models.

A simple medium-fidelity e-commerce website prototype built using Proto.io’s ready-made templates.

Random Graphs created by using variables.

An as close as possible copy of the IFTTT onboarding experience. This prototype is also made in 4 other tools (Pixate, Origami, Framer & Form) to compare the differences between them. More info: http://medium.com/sketch-app-sources/five-app-prototyping-tools-compared-form-framer-origami-pixate-proto-io-c2acc9062c61 Original app: http://appstore.com/IFbyIFTTT

An extended collection of fully animatable UI libraries like triangles, stars, arrows and more, let you bring your idea to life all within Proto.io.