What are some alternatives?
When comparing Mobile Sketchpad and lucasgruwez.github.io Waffle Grid, you can also consider the following products
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Webflow Flexbox UI Builder - Build flexible, responsive layouts — without writing code
Method Wireframe Kit - Find your method of being incredibly fast in prototyping.
FlexboxPatterns - Build awesome user interfaces with CSS flexbox
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
CSS Gridish - Automatically build your grid design's CSS code ✨