What are some alternatives?
When comparing hireframes.com Mobile Sketchpad and Method Wireframe Kit, you can also consider the following products
Whimsical Wireframes - Lightning fast wireframing with real-time collaboration.
Source Wireframe Kit - Library of 537 blocks for desktop and mobile prototyping
UX Flow Wireframe Prototyping System - Create beautiful user flows prototypes for your next project
Contra Wireframe Kit - Open source wireframe kit for design and prototyping 🚀
Mydraft.cc - 100% free wireframing
Wireframe Deck of Cards - A physical way to build and revise website and app layouts